WEBVTT 00:00:00.000 --> 00:00:02.339 Think about the last time you felt a tweak, maybe 00:00:02.339 --> 00:00:05.620 a persistent ache after a workout, or perhaps 00:00:05.620 --> 00:00:08.359 that sharp pain that just stops you in your tracks. 00:00:09.140 --> 00:00:12.240 Chances are it was your muscles or tendons letting 00:00:12.240 --> 00:00:14.580 you know something wasn't, well, quite right. 00:00:14.740 --> 00:00:17.719 Absolutely. These incredible tissues are just 00:00:17.719 --> 00:00:21.100 so fundamental to every single movement we make, 00:00:21.120 --> 00:00:24.640 from simply standing up to a high level athletic 00:00:24.640 --> 00:00:27.079 performance. But it's easy to take them for granted, 00:00:27.179 --> 00:00:28.820 isn't it, until they start complaining. Very 00:00:28.820 --> 00:00:31.079 easy. We often only know some when there's a 00:00:31.079 --> 00:00:33.799 problem. Welcome to the deep dive. We take a 00:00:33.799 --> 00:00:35.920 stack of sources, the latest research, clinical 00:00:35.920 --> 00:00:37.859 insights, expert perspectives you've shared with 00:00:37.859 --> 00:00:41.020 us, and while we dive deep, we try to unearth 00:00:41.020 --> 00:00:44.560 that crucial knowledge, those genuine aha moments, 00:00:44.619 --> 00:00:47.399 and sometimes the surprising facts hidden within. 00:00:47.859 --> 00:00:50.340 Our mission really is to cut through all that 00:00:50.340 --> 00:00:52.700 information overload and get you truly well -informed, 00:00:53.020 --> 00:00:55.719 quickly, engagingly on these complex topics. 00:00:55.759 --> 00:00:57.619 It's a vital service, I think. There's so much 00:00:57.619 --> 00:00:59.799 information out there. Today we're taking that 00:00:59.799 --> 00:01:02.579 deep dive into the fascinating and, let's be 00:01:02.579 --> 00:01:05.579 honest, often frustrating world of muscle and 00:01:05.579 --> 00:01:09.739 tendon injuries and how they heal. or sometimes, 00:01:10.099 --> 00:01:12.219 perhaps, don't quite heal perfectly. That's a 00:01:12.219 --> 00:01:14.359 key point, the not quite perfectly part. And 00:01:14.359 --> 00:01:17.420 to guide us through this really intricate landscape, 00:01:17.500 --> 00:01:20.620 we have someone who possesses a remarkable ability 00:01:20.620 --> 00:01:24.340 to synthesize diverse information, provide real 00:01:24.340 --> 00:01:26.799 clarity on these often misunderstood topics, 00:01:27.239 --> 00:01:29.359 drawing directly from the detailed source material 00:01:29.359 --> 00:01:31.239 we have in front of us. Well, thank you. It's 00:01:31.239 --> 00:01:33.540 a real pleasure to be here. Muscle and tendon 00:01:33.540 --> 00:01:35.659 issues are, well, they're universal, aren't they? 00:01:35.659 --> 00:01:37.799 They affect everyone from the elite athlete right 00:01:37.799 --> 00:01:39.430 down to someone just trying to walk comfortably. 00:01:40.049 --> 00:01:41.510 Absolutely. And the sources we're looking at 00:01:41.510 --> 00:01:44.790 today really highlight just how complex these 00:01:44.790 --> 00:01:47.469 tissues are beneath the surface and crucially 00:01:47.469 --> 00:01:50.650 how much goes into keeping them functioning optimally 00:01:50.650 --> 00:01:54.269 or trying to restore that function when things 00:01:54.269 --> 00:01:57.409 do go wrong. Okay let's unpack this then. Our 00:01:57.409 --> 00:02:00.730 sources cover a huge territory, really, from 00:02:00.730 --> 00:02:02.930 the microscopic building blocks all the way through 00:02:02.930 --> 00:02:06.450 to diagnosis, treatment, and even some, well, 00:02:06.650 --> 00:02:09.189 some really cutting edge approaches. Where do 00:02:09.189 --> 00:02:12.289 we logically begin this exploration? I think 00:02:12.289 --> 00:02:14.389 the most logical starting point, as the research 00:02:14.389 --> 00:02:16.830 suggests, is really with the fundamental structure 00:02:16.830 --> 00:02:19.129 and function of these tissues. You know, before 00:02:19.129 --> 00:02:21.289 we can understand injury or healing, we need 00:02:21.289 --> 00:02:23.509 to understand what's normal. Makes sense. Get 00:02:23.509 --> 00:02:26.289 the foundations right first. Exactly. So let's 00:02:26.289 --> 00:02:29.090 look at how muscles are built and then their 00:02:29.090 --> 00:02:31.610 crucial partners, the tendons. Right, the foundational 00:02:31.610 --> 00:02:33.969 building blocks. Starting with muscle, it's not 00:02:33.969 --> 00:02:36.409 just one monolithic type, is it? The sources 00:02:36.409 --> 00:02:38.509 suggest there's specialization built right in. 00:02:38.810 --> 00:02:41.610 Precisely. Skeletal muscle isn't uniform, not 00:02:41.610 --> 00:02:43.689 throughout the body, nor even within a single 00:02:43.689 --> 00:02:45.969 muscle sometimes. Oh, interesting. Why is that? 00:02:46.120 --> 00:02:48.180 Well, it's because the body needs to generate 00:02:48.180 --> 00:02:50.780 such a wide range of movements and forces. Everything 00:02:50.780 --> 00:02:53.219 from, you know, maintaining subtle posture for 00:02:53.219 --> 00:02:56.379 hours, right up to producing explosive power 00:02:56.379 --> 00:02:59.159 for a sprint or lifting a maximum weight. A huge 00:02:59.159 --> 00:03:02.259 range. A huge range. And this finely tunable 00:03:02.259 --> 00:03:04.960 output, the power the muscle generates, it's 00:03:04.960 --> 00:03:07.860 fundamentally a product of two things. The force 00:03:07.860 --> 00:03:09.680 the individual muscle fibers can generate and 00:03:09.680 --> 00:03:12.219 the velocity, the speed. at which they can contract. 00:03:12.340 --> 00:03:14.740 Force and velocity. And that velocity, the speed, 00:03:15.280 --> 00:03:17.620 is largely dictated by different versions, or 00:03:17.620 --> 00:03:20.400 isoforms, of a really key protein called myosin 00:03:20.400 --> 00:03:24.639 heavy chain, MHC. Ah, yes, the MHC isoforms. 00:03:24.659 --> 00:03:26.460 I remember seeing those detailed in the sources 00:03:26.460 --> 00:03:28.639 linking them directly to speed. That's right. 00:03:28.860 --> 00:03:31.240 We typically classify muscle fibers based on 00:03:31.240 --> 00:03:34.180 which MHC isoform they contain. You have Type 00:03:34.180 --> 00:03:37.020 I, often called slow fiber, which primarily contain 00:03:37.020 --> 00:03:39.400 MHC1B. Slow, okay. Then there are intermediate 00:03:39.400 --> 00:03:42.340 fibers, Type I, containing MHCIA. And finally, 00:03:42.439 --> 00:03:45.180 the fast fibers, Type I, is containing MHCIA. 00:03:45.439 --> 00:03:48.740 So slow, intermediate, and fast. Exactly. And 00:03:48.740 --> 00:03:50.860 the critical functional difference lies in their 00:03:50.860 --> 00:03:53.599 ATPase activity level. Myosin is an enzyme that 00:03:53.599 --> 00:03:55.900 breaks down ATP for energy for contraction. Right. 00:03:56.159 --> 00:03:58.539 The MEC1B in those slow fibers has significantly 00:03:58.539 --> 00:04:00.900 slower ATPase activity. The sources point out 00:04:00.900 --> 00:04:04.039 it can be seven to nine times slower. Seven to 00:04:04.039 --> 00:04:06.939 nine times, wow. Compared to the type EX fibers 00:04:06.939 --> 00:04:10.199 with MHCI's, that's a huge difference in enzymatic 00:04:10.199 --> 00:04:13.620 speed. So it's not just a simple slow and fast 00:04:13.620 --> 00:04:16.100 twitch then, but there's this whole spectrum, 00:04:16.339 --> 00:04:18.839 a gradient of speed dictated by this specific 00:04:18.839 --> 00:04:21.449 protein's activity. Precisely. A spectrum. And 00:04:21.449 --> 00:04:23.870 muscle power output depends on regulating both 00:04:23.870 --> 00:04:26.610 the force and the speed. Exactly. Both the force 00:04:26.610 --> 00:04:29.410 and the velocity depend on the inherent properties 00:04:29.410 --> 00:04:32.290 of these different muscle fiber types and also 00:04:32.290 --> 00:04:34.470 the characteristics of the motor units. Which 00:04:34.470 --> 00:04:36.730 is the nerve and the fibers it controls. Spot 00:04:36.730 --> 00:04:39.129 on. The motor neuron from the nervous system 00:04:39.129 --> 00:04:41.470 and all the muscle fibers it innervates. And 00:04:41.470 --> 00:04:43.529 crucially, how these motor units are recruited 00:04:43.529 --> 00:04:46.189 by the brain and spinal cord. Ah, the recruitment 00:04:46.189 --> 00:04:49.110 pattern. Yes. This precise control over which 00:04:49.110 --> 00:04:51.709 motor units are activated and how fast allows 00:04:51.709 --> 00:04:54.250 for that incredibly finely tuned output the source 00:04:54.250 --> 00:04:57.009 has mentioned. It enables everything from picking 00:04:57.009 --> 00:04:59.629 up an egg very gently to, well, attempting to 00:04:59.629 --> 00:05:02.129 lift a car. OK, so muscles have different fiber 00:05:02.129 --> 00:05:04.829 types recruited in specific ways to contribute 00:05:04.829 --> 00:05:08.269 both force and speed. That's clear. Now let's 00:05:08.269 --> 00:05:11.209 shift to their crucial partners. The tendons. 00:05:11.410 --> 00:05:14.269 They connect muscle to bone, transmit that force. 00:05:14.730 --> 00:05:16.790 How are they structured to handle such, well, 00:05:17.050 --> 00:05:20.029 such immense loads? Tendons are truly remarkable 00:05:20.029 --> 00:05:22.709 structures. Load -bearing marvels, really. On 00:05:22.709 --> 00:05:25.490 the outside, they're encased by a sheath called 00:05:25.490 --> 00:05:28.709 the peritonon, which helps reduce friction. But 00:05:28.709 --> 00:05:32.189 internally, It's a complex, hierarchical structure. 00:05:32.310 --> 00:05:34.610 It always reminds me of a sort of braided cable. 00:05:34.709 --> 00:05:37.350 Like a rope. Exactly. The most basic building 00:05:37.350 --> 00:05:39.870 blocks are collagen molecules. These assemble 00:05:39.870 --> 00:05:42.189 into tiny, incredibly strong collagen fibrils. 00:05:42.290 --> 00:05:44.110 And the sources get quite specific about the 00:05:44.110 --> 00:05:46.069 size of these fibrils, don't they? They do. Their 00:05:46.069 --> 00:05:47.730 diameter is specifically mentioned because it 00:05:47.730 --> 00:05:49.529 actually varies depending on the functional role 00:05:49.529 --> 00:05:52.310 of that particular tendon. It ranges from about 00:05:52.310 --> 00:05:55.529 20 nanometers up to 150 nanometers. Quite a range. 00:05:55.930 --> 00:05:58.410 Depends on the job it has to do. Precisely. And 00:05:58.410 --> 00:06:01.029 these individual fibrils then aggregate. They 00:06:01.029 --> 00:06:03.990 bundle together to form larger bundles. The sources 00:06:03.990 --> 00:06:07.069 refer to them as sub -physicular, secondary, 00:06:07.290 --> 00:06:09.810 and tertiary bands. Okay, layers of bundling. 00:06:09.889 --> 00:06:12.470 Yes. And all of these bundles are surrounded 00:06:12.470 --> 00:06:15.069 and separated by another internal layer of connective 00:06:15.069 --> 00:06:18.149 tissue called the indotendum. So it really is 00:06:18.149 --> 00:06:20.470 like ropes twisted together into bigger ropes, 00:06:20.689 --> 00:06:23.269 all separated by sheaths inside. That's a very 00:06:23.269 --> 00:06:26.420 apt analogy, yes. And a key structural feature 00:06:26.420 --> 00:06:28.480 that gives the tendon its incredible tensile 00:06:28.480 --> 00:06:31.300 strength is that the vast majority of these collagen 00:06:31.300 --> 00:06:34.740 fibers and their bundles are aligned almost perfectly 00:06:34.740 --> 00:06:37.800 with the main axis of the tendon. The alignment 00:06:37.800 --> 00:06:40.300 is critical. Absolutely critical. This specific 00:06:40.300 --> 00:06:42.339 alignment ensures that when the muscle pulls, 00:06:43.000 --> 00:06:45.600 the force is transmitted efficiently along the 00:06:45.600 --> 00:06:48.230 tendon towards the bone. And this ability to 00:06:48.230 --> 00:06:50.490 resist load is closely associated with the average 00:06:50.490 --> 00:06:52.470 diameter of those collagen fibers we just mentioned. 00:06:53.170 --> 00:06:55.170 It's a structure purpose -built for tension. 00:06:55.589 --> 00:06:57.589 It makes perfect sense. You want everything pulling 00:06:57.589 --> 00:07:00.050 in the same direction. Now, where the muscle 00:07:00.050 --> 00:07:02.230 and tendon meet the muscle -tendon junction, 00:07:02.529 --> 00:07:05.550 or MTJ, this must be a critical zone, how do 00:07:05.550 --> 00:07:08.269 these two very different tissues connect so seamlessly? 00:07:08.750 --> 00:07:11.819 The MTJ is indeed critically important. But it's 00:07:11.819 --> 00:07:15.300 also often a vulnerable transition zone. It's 00:07:15.300 --> 00:07:17.980 where the force generated by the muscle is efficiently 00:07:17.980 --> 00:07:20.360 transferred to the much stiffer tendon. Right, 00:07:20.639 --> 00:07:22.920 managing that transition and stiffness. Exactly. 00:07:23.259 --> 00:07:25.379 And the connection isn't a simple flat surface. 00:07:25.680 --> 00:07:28.019 The tendon fibrils don't just butt up against 00:07:28.019 --> 00:07:30.720 the muscle fibers. Instead, the muscle fiber 00:07:30.720 --> 00:07:34.079 membrane forms these elaborate folds, almost 00:07:34.079 --> 00:07:36.480 like fingers interlocking with the tendon. Cover, 00:07:36.699 --> 00:07:39.370 increasing the surface area. Precisely. It dramatically 00:07:39.370 --> 00:07:41.129 increases the surface area for the connection, 00:07:41.769 --> 00:07:44.370 which in turn spreads the load over a much larger 00:07:44.370 --> 00:07:46.509 area, reducing stress concentrations. That makes 00:07:46.509 --> 00:07:48.779 sense. And then at an even finer level... The 00:07:48.779 --> 00:07:51.939 sources describe very, very fine filaments, only 00:07:51.939 --> 00:07:54.660 two to seven nanometers in diameter. And these 00:07:54.660 --> 00:07:57.540 are oriented approximately perpendicular to the 00:07:57.540 --> 00:07:59.660 main force vector. Perpendicular, like cross 00:07:59.660 --> 00:08:02.540 bracing. Almost like micro ligaments, yes. They 00:08:02.540 --> 00:08:04.959 connect the terminal myofibrils, that's the contractile 00:08:04.959 --> 00:08:07.459 machinery, within the muscle fibers directly 00:08:07.459 --> 00:08:10.160 to the collagen fibres of the tendon. It's a 00:08:10.160 --> 00:08:14.120 marvel of precise micro level linkage. That's 00:08:14.120 --> 00:08:17.139 incredible detail. And is this junction static? 00:08:17.720 --> 00:08:20.269 Fixed? Or does it change and adapt over time, 00:08:20.290 --> 00:08:22.769 perhaps with training? Here's where it gets really 00:08:22.769 --> 00:08:26.050 interesting. What's fascinating is the significant 00:08:26.050 --> 00:08:29.970 plasticity at the MTJ. Plasticity, meaning it 00:08:29.970 --> 00:08:32.389 can change. Yes. The sources point out the ability 00:08:32.389 --> 00:08:34.289 of the muscle side of this junction to develop 00:08:34.289 --> 00:08:37.070 new sarcomeres, those basic contritel units of 00:08:37.070 --> 00:08:39.769 the muscle fiber, specifically at this transition 00:08:39.769 --> 00:08:42.370 zone. Wow. This happens with growth, development, 00:08:42.629 --> 00:08:45.210 or as a result of things like muscle hypertrophy, 00:08:45.230 --> 00:08:47.470 getting bigger or prolonged stretch. So it can 00:08:47.470 --> 00:08:50.509 actually grow new contractile units right there 00:08:50.509 --> 00:08:52.870 at the connection. Exactly. This allows for localized 00:08:52.870 --> 00:08:54.950 changes and regional specializations right at 00:08:54.950 --> 00:08:57.230 the interface. It shows just how dynamic and 00:08:57.230 --> 00:08:59.610 adaptable this critical connection zone is. It 00:08:59.610 --> 00:09:01.669 can remodel itself based on the demands placed 00:09:01.669 --> 00:09:05.190 upon it. So it's not a fixed point at all, but 00:09:05.190 --> 00:09:08.169 a living adaptable connection that can grow and 00:09:08.169 --> 00:09:11.419 change. That's crucial context for understanding 00:09:11.419 --> 00:09:15.080 how these tissues respond to load. Okay, moving 00:09:15.080 --> 00:09:17.539 on from structure, let's talk about how tendons 00:09:17.539 --> 00:09:21.240 actually behave, particularly under load. They 00:09:21.240 --> 00:09:23.360 aren't just simple elastic bands that stretch 00:09:23.360 --> 00:09:26.019 and recoil instantly, are they? The sources mention 00:09:26.019 --> 00:09:29.320 something called viscoelasticity. They're definitely 00:09:29.320 --> 00:09:32.340 not simple elastic bands. No. Tendons are classic 00:09:32.340 --> 00:09:35.000 examples of viscoelastic materials. Discoelastic. 00:09:35.120 --> 00:09:37.179 OK, break that down for us. It means they possess 00:09:37.179 --> 00:09:40.059 properties of both elastic solids, which deform 00:09:40.059 --> 00:09:42.559 instantly under load and return to their original 00:09:42.559 --> 00:09:44.620 shape when the load is removed, like, say, a 00:09:44.620 --> 00:09:47.039 rubber band. Right. And viscous liquids, which 00:09:47.039 --> 00:09:49.039 deform over time under a constant load, like 00:09:49.039 --> 00:09:52.120 honey slowly dripping. OK. Solid and liquid properties 00:09:52.120 --> 00:09:55.580 combined. Exactly. So the response to load isn't 00:09:55.580 --> 00:09:57.720 instantaneous and linear. It's time dependent. 00:09:57.909 --> 00:10:00.450 And it's also dependent on the speed, the rate 00:10:00.450 --> 00:10:02.929 of the applied load. So a bit like pushing on 00:10:02.929 --> 00:10:04.929 Silly Putty versus, I don't know, pulling on 00:10:04.929 --> 00:10:07.490 a strong spring. The response depends on how 00:10:07.490 --> 00:10:09.730 fast and hard you interact with it. That's actually 00:10:09.730 --> 00:10:13.129 a good analogy to grasp the concept. Yes. When 00:10:13.129 --> 00:10:15.889 you stretch a viscoelastic material and hold 00:10:15.889 --> 00:10:18.870 it at a constant length, the force required to 00:10:18.870 --> 00:10:22.269 maintain that stretch decreases over time. That's 00:10:22.269 --> 00:10:24.309 called stress relaxation. Stress relaxation, 00:10:24.309 --> 00:10:27.429 okay. Versely, if you apply constant force, the 00:10:27.429 --> 00:10:30.250 material will continue to deform or stretch. 00:10:30.590 --> 00:10:33.149 Over time, that's called creep. Creep, got it. 00:10:33.289 --> 00:10:36.289 This time dependent behavior is really key to 00:10:36.289 --> 00:10:38.870 how tendons function in the body. It allows them 00:10:38.870 --> 00:10:41.370 to store and release energy, but it also makes 00:10:41.370 --> 00:10:44.409 their response quite complex. The sources detail 00:10:44.409 --> 00:10:47.610 specific testing methods used in the lab to understand 00:10:47.610 --> 00:10:50.309 these viscoelastic properties, right? Can you 00:10:50.309 --> 00:10:53.049 walk us through that? Yes, they describe a typical 00:10:53.049 --> 00:10:55.669 viscoelastic testing protocol. This is often 00:10:55.669 --> 00:10:58.950 used on, say, isolated tendon samples in a lab. 00:10:59.289 --> 00:11:01.269 It usually starts with preconditioning. Preconditioning. 00:11:01.350 --> 00:11:03.529 Yes. That involves cycling the tendon through 00:11:03.529 --> 00:11:06.230 a few stretches and releases first, just to standardize 00:11:06.230 --> 00:11:08.909 its mechanical state and get a consistent response 00:11:08.909 --> 00:11:10.690 for the subsequent test. Right, get it settled. 00:11:11.049 --> 00:11:13.990 Exactly. Then comes stress relaxation testing. 00:11:14.750 --> 00:11:17.250 The tendon is rapidly stretched to a certain 00:11:17.250 --> 00:11:19.730 length and held there, and you measure the decrease 00:11:19.730 --> 00:11:22.529 in force over time. Frequency sweeps involve 00:11:22.529 --> 00:11:24.429 oscillating the tendon's length at different 00:11:24.429 --> 00:11:26.990 speeds or frequencies. This lets you see how 00:11:26.990 --> 00:11:29.409 its stiffness and its energy dissipation properties 00:11:29.409 --> 00:11:32.450 change with the rate of loading. And ultimately, 00:11:32.669 --> 00:11:34.769 to understand their maximum capacity, I assume 00:11:34.769 --> 00:11:38.350 they test them until they break. Exactly. A critical 00:11:38.350 --> 00:11:40.429 part of understanding the mechanical limits is 00:11:40.429 --> 00:11:43.830 performing a ramp to failure test. Here, the 00:11:43.830 --> 00:11:46.110 load or the deformation is steadily increased 00:11:46.110 --> 00:11:49.070 until the tendon actually ruptures. This determines 00:11:49.070 --> 00:11:51.789 the maximum force or stress the tendon can withstand. 00:11:52.210 --> 00:11:55.789 Makes sense. What factors, besides the inherent 00:11:55.789 --> 00:11:58.250 tissue properties themselves, can influence this 00:11:58.250 --> 00:12:00.850 mechanical behavior, both in the lab testing 00:12:00.850 --> 00:12:04.210 and, importantly, in a living body? Well, several 00:12:04.210 --> 00:12:06.370 external factors matter quite a bit. Temperature, 00:12:06.370 --> 00:12:08.649 for instance, has a notable effect. Temperature? 00:12:08.690 --> 00:12:11.620 How so? Decreased temperature tends to make tendons 00:12:11.620 --> 00:12:14.399 less viscous and more elastic, meaning they might 00:12:14.399 --> 00:12:17.100 become stiffer and perhaps less able to absorb 00:12:17.100 --> 00:12:19.919 energy quickly. This is why controlling temperature, 00:12:20.379 --> 00:12:22.940 often using a water bath set at body temperature, 00:12:23.299 --> 00:12:25.720 is important during lab testing to try and simulate 00:12:25.720 --> 00:12:28.659 in vivo conditions. Right, mimic the body's environment. 00:12:28.799 --> 00:12:31.899 Precisely. And the rate of loading also has a 00:12:31.899 --> 00:12:34.379 significant impact. The sources explain that 00:12:34.379 --> 00:12:36.700 these rake -dependent mechanical changes in tendons 00:12:36.700 --> 00:12:39.399 are associated with how the wavy structure of 00:12:39.399 --> 00:12:42.399 collagen, called the crimp, how that straightens 00:12:42.399 --> 00:12:44.639 out, that's called uncrimping, and also with 00:12:44.639 --> 00:12:46.620 volumetric contraction of the tissue under load. 00:12:47.139 --> 00:12:49.320 Loading it quickly activates different responses 00:12:49.320 --> 00:12:51.980 and uses different mechanisms of deformation 00:12:51.980 --> 00:12:54.919 compared to loading it slowly. Fascinating. And 00:12:54.919 --> 00:12:57.120 getting accurate data during these tests sounds 00:12:57.120 --> 00:12:59.200 incredibly critical if you want to draw valid 00:12:59.200 --> 00:13:01.700 conclusions. It's absolutely vital. The sources 00:13:01.700 --> 00:13:04.059 really emphasize the importance of accurately 00:13:04.059 --> 00:13:06.419 measuring the tendon's cross -sectional area. 00:13:07.299 --> 00:13:09.759 Ideally, this is done using non -contact methods 00:13:09.759 --> 00:13:12.259 like laser -based systems during the testing 00:13:12.259 --> 00:13:14.809 itself. Why is that so important? Because that 00:13:14.809 --> 00:13:17.289 measurement is essential for properly reporting 00:13:17.289 --> 00:13:19.830 the material properties, like stress, which is 00:13:19.830 --> 00:13:22.090 force per unit area, it allows you to compare 00:13:22.090 --> 00:13:24.889 samples of different sizes fairly. Ah, okay. 00:13:25.169 --> 00:13:28.830 Standardizes the results. Exactly. Also, accurately 00:13:28.830 --> 00:13:31.870 measuring strain, the percentage of deformation 00:13:31.870 --> 00:13:34.830 or stretch requires non -contact techniques as 00:13:34.830 --> 00:13:37.330 well. Things like optical tracking of markers 00:13:37.330 --> 00:13:40.330 placed on the tendon surface. This helps reduce 00:13:40.330 --> 00:13:43.519 errors from, say, grip slip when you're mounting 00:13:43.519 --> 00:13:45.480 the tendon in the testing machine. Grip slip, 00:13:45.539 --> 00:13:47.679 right. You need to know exactly how much the 00:13:47.679 --> 00:13:49.960 tissue itself is deforming, not just how much 00:13:49.960 --> 00:13:52.460 the grips holding it have moved. Right, measuring 00:13:52.460 --> 00:13:55.220 the tissue's intrinsic response, not the equipment's 00:13:55.220 --> 00:13:57.740 limitations. That covers the lab side quite well. 00:13:58.139 --> 00:14:01.159 How do live tendons, tendons in our bodies, respond 00:14:01.159 --> 00:14:03.919 to the loads they experience every day or perhaps 00:14:03.919 --> 00:14:06.820 during exercise? Well, in vivo, the response 00:14:06.820 --> 00:14:09.340 is complex and primarily cell -driven. Cell -driven. 00:14:09.419 --> 00:14:12.299 Yes. When you apply a tensile load to a living 00:14:12.299 --> 00:14:15.220 tendon, it causes mechanical deformation of both 00:14:15.220 --> 00:14:17.320 the extracellular matrix, that's the collagen, 00:14:17.659 --> 00:14:19.580 and the ground substance and the cells within 00:14:19.580 --> 00:14:22.899 it, the tenocytes. These tenocytes are mechanosensitive. 00:14:23.299 --> 00:14:26.220 They sense this mechanical loading and translate 00:14:26.220 --> 00:14:29.480 it into biochemical signals. So the cells feel 00:14:29.480 --> 00:14:32.539 the stretch and react. Precisely. This cellular 00:14:32.539 --> 00:14:35.639 response leads to changes in ECM protein production 00:14:35.639 --> 00:14:38.720 specifically, changes in both collagen degradation 00:14:38.720 --> 00:14:41.149 and production. It's a constant turnover. And 00:14:41.149 --> 00:14:43.710 there's a specific timing for this cellular response, 00:14:43.789 --> 00:14:46.029 isn't there? Yes. The sources indicate there's 00:14:46.029 --> 00:14:49.090 a definite temporal pattern. Peak collagen synthesis, 00:14:49.330 --> 00:14:51.950 the building of new collagen, occurs around 24 00:14:51.950 --> 00:14:55.129 hours after a bout of loading. 24 hours. And 00:14:55.129 --> 00:14:57.409 this elevated synthesis can remain for up to 00:14:57.409 --> 00:15:01.289 72 hours. This increased turnover of matrix proteins 00:15:01.289 --> 00:15:03.710 is thought to be a fundamental part of maintaining 00:15:03.710 --> 00:15:06.330 normal tissue homeostasis, keeping the tendon 00:15:06.330 --> 00:15:09.169 healthy, strong, and adapted to its usual loads. 00:15:09.370 --> 00:15:11.470 Does it matter how the load is applied? Do different 00:15:11.470 --> 00:15:13.509 types of muscle contraction impact this tissue 00:15:13.509 --> 00:15:16.409 response differently? Say concentric shortening 00:15:16.409 --> 00:15:18.909 contractions versus eccentric lengthening ones 00:15:18.909 --> 00:15:21.350 or even static isometric holds? That's a good 00:15:21.350 --> 00:15:23.870 question. The sources suggest that the different 00:15:23.870 --> 00:15:26.289 muscle contraction types don't seem to affect 00:15:26.289 --> 00:15:29.610 the synthesis or degradation of collagen in fundamentally 00:15:29.610 --> 00:15:32.190 different ways, provided the total tendon strain 00:15:32.190 --> 00:15:34.450 is similar. Ah, so it's the amount of strain 00:15:34.450 --> 00:15:37.100 that matters most. It seems so. Any differences 00:15:37.100 --> 00:15:39.100 seen in studies are likely related to the amount 00:15:39.100 --> 00:15:41.879 of strain or load experienced by the tendon during 00:15:41.879 --> 00:15:44.220 that type of activity, rather than the specific 00:15:44.220 --> 00:15:47.159 muscle contraction type itself. It's not just 00:15:47.159 --> 00:15:50.799 collagen either. Other matrix proteins like proteoglycans 00:15:50.799 --> 00:15:54.220 also show increased turnover in response to exercise, 00:15:54.519 --> 00:15:56.980 contributing to the overall adaptive capacity 00:15:56.980 --> 00:16:00.490 of the tissue. So the tendon is constantly responding, 00:16:00.789 --> 00:16:03.210 remodeling, adapting based on the mechanical 00:16:03.210 --> 00:16:06.230 load it experiences. This dynamic process is 00:16:06.230 --> 00:16:08.990 usually brilliant, but sometimes it goes wrong, 00:16:09.169 --> 00:16:11.389 leading to injury. Muscle strains, for example, 00:16:11.490 --> 00:16:13.470 are incredibly common, aren't they? They are, 00:16:13.470 --> 00:16:16.269 unfortunately, very common. Muscle strain injuries 00:16:16.269 --> 00:16:19.570 are among the most frequent and, frankly, debilitating 00:16:19.570 --> 00:16:21.970 injuries in sport and recreation. Debilitating, 00:16:22.049 --> 00:16:24.370 definitely. They can have significant short -term 00:16:24.370 --> 00:16:26.629 impacts, like substantial time loss from work 00:16:26.629 --> 00:16:29.889 or activity, but also worrying long -term consequences. 00:16:30.240 --> 00:16:33.019 sometimes making it difficult for individuals, 00:16:33.340 --> 00:16:36.139 especially athletes, to regain their pre -injury 00:16:36.139 --> 00:16:38.600 performance levels. A real challenge. It is. 00:16:38.820 --> 00:16:41.080 And the sources highlight that despite how common 00:16:41.080 --> 00:16:44.340 they are, the exact location of damage, particularly 00:16:44.340 --> 00:16:46.639 within that crucial muscle tendon junction we 00:16:46.639 --> 00:16:49.139 discussed. Right, the MTJ. And the predisposing 00:16:49.139 --> 00:16:51.179 factors in what seem like healthy, uninjured 00:16:51.179 --> 00:16:54.460 muscles are still areas of active study and debate, 00:16:54.759 --> 00:16:57.080 though our understanding has certainly expanded 00:16:57.080 --> 00:16:59.289 significantly. OK, and what about tendon issues? 00:16:59.529 --> 00:17:01.549 We used to share the term tendonitis all the 00:17:01.549 --> 00:17:04.630 time, implying simple inflammation. But the sources 00:17:04.630 --> 00:17:07.069 really seem to challenge that idea, suggesting 00:17:07.069 --> 00:17:10.029 a different primary problem, especially in chronic 00:17:10.029 --> 00:17:12.950 cases. Yes. This is a crucial shift in understanding 00:17:12.950 --> 00:17:15.690 that the sources really reinforce. There's been 00:17:15.690 --> 00:17:17.990 a significant move away from viewing chronic 00:17:17.990 --> 00:17:21.369 tendon pain solely as tendonitis, implying primary 00:17:21.369 --> 00:17:24.369 inflammation. So it's not ITIS meaning inflammation? 00:17:24.809 --> 00:17:27.880 Not primarily, no. The source material clearly 00:17:27.880 --> 00:17:31.200 states that tendinopathy, particularly in its 00:17:31.200 --> 00:17:34.420 chronic forms, is often characterized by degeneration 00:17:34.420 --> 00:17:37.940 rather than primary inflammation. A classic example 00:17:37.940 --> 00:17:41.279 cited is chronic lateral epicondylitis, tennis 00:17:41.279 --> 00:17:44.539 elbow. Histological studies often show a striking 00:17:44.539 --> 00:17:47.980 lack of significant inflammatory cells. Really? 00:17:48.259 --> 00:17:51.759 No inflammation. So what does this degeneration 00:17:51.759 --> 00:17:54.640 actually look like at a microscopic level then? 00:17:54.759 --> 00:17:57.559 In what's often described pathologically as tendinosis, 00:17:57.640 --> 00:18:00.200 you see distinct microstructural changes. There's 00:18:00.200 --> 00:18:02.859 often a loss of collagen continuity. The collagen 00:18:02.859 --> 00:18:04.759 fibers aren't neatly aligned and organized anymore. 00:18:04.759 --> 00:18:07.259 They might be disrupted or fragmented. Disorganized. 00:18:07.359 --> 00:18:09.700 Very much so. There's typically an increase in 00:18:09.700 --> 00:18:11.599 what's called ground substance, the sort of non 00:18:11.599 --> 00:18:13.599 -collagenous matrix material. The tenocytes, 00:18:13.680 --> 00:18:16.079 the tendon cells themselves, also show changes. 00:18:16.099 --> 00:18:18.460 They can be more numerous, more rounded, looking 00:18:18.460 --> 00:18:20.380 different from the normal flattened tenocytes. 00:18:20.400 --> 00:18:22.859 OK. And you often see increased vascularity, 00:18:22.900 --> 00:18:25.700 the in -growth of new often disorganized blood 00:18:25.700 --> 00:18:27.839 vessels into areas that are normally relatively 00:18:27.839 --> 00:18:29.859 vascular, meaning they don't usually have much 00:18:29.859 --> 00:18:32.559 blood supply. So it's not classic inflammation. 00:18:32.900 --> 00:18:37.579 It's more like tissue breakdown and a kind of 00:18:37.579 --> 00:18:40.119 disorganized failed healing attempt. That's a 00:18:40.119 --> 00:18:42.539 very good way to put it, yes. A failed healing 00:18:42.539 --> 00:18:44.869 response. That fundamentally changes how we should 00:18:44.869 --> 00:18:47.130 think about the problem. If it's not just inflammation 00:18:47.130 --> 00:18:49.549 and it's often degenerative, what makes someone 00:18:49.549 --> 00:18:52.650 susceptible to developing tendinopathy? The sources 00:18:52.650 --> 00:18:56.190 list several risk factors, painting quite a multifactorial 00:18:56.190 --> 00:18:57.930 picture. It's definitely not a single cause. 00:18:58.009 --> 00:19:01.210 It's a complex interplay of factors. Age is a 00:19:01.210 --> 00:19:03.490 significant risk factor mentioned, associated 00:19:03.490 --> 00:19:06.730 with both degenerative pathology and tendon rupture 00:19:06.730 --> 00:19:10.069 risk. Age, right. However, the sources add an 00:19:10.069 --> 00:19:13.150 important nuance. Aging alone doesn't fully explain 00:19:13.150 --> 00:19:15.509 it, while structural changes like increased stiffness, 00:19:16.289 --> 00:19:18.349 decreased deformation capacity, increased cross 00:19:18.349 --> 00:19:21.190 -sectional area, and decreased peak stress and 00:19:21.190 --> 00:19:24.250 strain are observed in older tendons. When you 00:19:24.250 --> 00:19:27.710 normalize for force output basically, accounting 00:19:27.710 --> 00:19:29.430 for the fact that older muscles might generate 00:19:29.430 --> 00:19:32.250 less maximum force, some of these measured mechanical 00:19:32.250 --> 00:19:34.789 differences diminish. Ah, so it's not just the 00:19:34.789 --> 00:19:37.190 tendon wearing out. Possibly not just that in 00:19:37.190 --> 00:19:40.099 isolation. It suggests that changes in the muscle's 00:19:40.099 --> 00:19:42.539 force output capacity might be more responsible 00:19:42.539 --> 00:19:46.200 for the observed alterations in the overall muscle 00:19:46.200 --> 00:19:49.180 tendon unit's function during aging, rather than 00:19:49.180 --> 00:19:51.660 just the tendon tissue itself degrading independently. 00:19:52.019 --> 00:19:53.980 That's a really insightful distinction. It's 00:19:53.980 --> 00:19:55.920 about the function of the whole unit. Exactly. 00:19:56.420 --> 00:19:59.599 With age, there's also increased collagen crosslinking, 00:20:00.160 --> 00:20:02.940 decreased water content, a decreased concentration 00:20:02.940 --> 00:20:05.839 of collagen overall, and often decreased blood 00:20:05.839 --> 00:20:08.960 supply. All these factors contribute to a decreased 00:20:08.960 --> 00:20:12.099 overall load capacity. Less able to handle stress. 00:20:12.539 --> 00:20:14.839 Particularly for activities involving rapid energy 00:20:14.839 --> 00:20:17.660 storage and release, like jumping or fast running. 00:20:18.240 --> 00:20:20.279 The sources also point out that cumulative loading 00:20:20.279 --> 00:20:22.819 over a lifetime, especially a history of high 00:20:22.819 --> 00:20:25.339 -level athletic participation, seems to be a 00:20:25.339 --> 00:20:27.720 factor. Former athletes seem to exhibit higher 00:20:27.720 --> 00:20:29.940 rates of tendinopathy and rupture later in life. 00:20:30.180 --> 00:20:32.900 Beyond age and activity history, genetics also 00:20:32.900 --> 00:20:35.380 seems to play a role. I saw that mentioned. Yes. 00:20:35.549 --> 00:20:37.750 Genetic factors are increasingly implicated in 00:20:37.750 --> 00:20:41.769 the pathogenesis, the development of tendinopathy. 00:20:42.170 --> 00:20:44.730 Twin studies, for instance, has suggested a genetic 00:20:44.730 --> 00:20:48.450 predisposition for conditions like lateral epicondylogia. 00:20:48.670 --> 00:20:50.910 Specific genes. Yes. The source has mentioned 00:20:50.910 --> 00:20:53.170 specific genes that have been linked. One is 00:20:53.170 --> 00:20:57.230 COL5A1. This encodes a component of type V collagen. 00:20:57.630 --> 00:21:00.410 Type V collagen. What does that do? It's important 00:21:00.410 --> 00:21:03.559 because it plays a role in organizing the much 00:21:03.559 --> 00:21:07.160 more abundant type I collagen fibers into bundles. 00:21:07.559 --> 00:21:10.740 Variants in this COL5A1 gene are associated with 00:21:10.740 --> 00:21:13.039 more tightly packed collagen bundles. Tightly 00:21:13.039 --> 00:21:16.259 packed? Sounds strong. You'd think so. But while 00:21:16.259 --> 00:21:18.059 this structure might theoretically be better 00:21:18.059 --> 00:21:20.460 for energy storage, it could also potentially 00:21:20.460 --> 00:21:22.339 make the tendon more vulnerable to certain types 00:21:22.339 --> 00:21:24.859 of stress. And variations here are linked to 00:21:24.859 --> 00:21:27.640 an increased risk of Achilles tendonopathy. Interesting. 00:21:28.320 --> 00:21:31.119 Stronger, but maybe less resilient or adaptable 00:21:31.119 --> 00:21:33.000 under certain stresses. That's one hypothesis, 00:21:33.240 --> 00:21:35.960 yes. Another gene mentioned is 10 -SNC, or TNC. 00:21:36.140 --> 00:21:39.039 This is an anti -adhesive protein. It seems to 00:21:39.039 --> 00:21:41.259 be important in regulating how the tendon adapts 00:21:41.259 --> 00:21:43.559 to load and compression. Variants of the TNC 00:21:43.559 --> 00:21:46.660 gene have also been linked with Achilles tendonopathy, 00:21:47.099 --> 00:21:49.640 with some polymorphisms reported to increase 00:21:49.640 --> 00:21:52.579 the risk six -fold. Six -fold, that's significant. 00:21:52.680 --> 00:21:54.890 It is. Though the sources do note conflicting 00:21:54.890 --> 00:21:56.950 results regarding links between these genes and 00:21:56.950 --> 00:21:59.890 other injuries, like ACL tears. So it suggests 00:21:59.890 --> 00:22:02.890 the genetic influence is complex, likely specific 00:22:02.890 --> 00:22:05.730 to certain tendons or injury types, not necessarily 00:22:05.730 --> 00:22:08.579 a universal predisposition. Fascinating how our 00:22:08.579 --> 00:22:10.920 fundamental genetic code can influence our tissue's 00:22:10.920 --> 00:22:13.200 resilience. And of course, the specific activity 00:22:13.200 --> 00:22:15.579 itself, the type and amount of load we put on 00:22:15.579 --> 00:22:18.279 the tissue, that's got to be a huge factor in 00:22:18.279 --> 00:22:20.740 who gets what type of tendinopathy. So absolutely, 00:22:21.099 --> 00:22:23.700 huge. The sources clearly associate specific 00:22:23.700 --> 00:22:26.539 activities in biomechanics with particular tendinopathies. 00:22:27.119 --> 00:22:29.619 Yeah. Lateral elbow issues, tennis. elbow common 00:22:29.619 --> 00:22:32.579 in manual work, ribbing tasks, racket sports, 00:22:33.039 --> 00:22:35.740 especially for those over 40. Rotator cuff tendinopathy 00:22:35.740 --> 00:22:38.160 in the shoulder is strongly linked to overhead 00:22:38.160 --> 00:22:41.319 activity, seen frequently in both young overhead 00:22:41.319 --> 00:22:44.759 athletes and individuals over 50. Hamstring injuries 00:22:44.759 --> 00:22:46.779 are very prevalent in sports involving sprinting 00:22:46.779 --> 00:22:49.920 or stretching. And interestingly, muscle tendon 00:22:49.920 --> 00:22:52.319 dimensions. Dimensions, like how big the muscle 00:22:52.319 --> 00:22:55.680 is. Sort of. Like the width of the eponeurosis, 00:22:55.859 --> 00:22:57.940 that cheat -like tendon relative to the muscle 00:22:57.940 --> 00:23:00.819 width in sprinters. That ratio can contribute 00:23:00.819 --> 00:23:03.819 to susceptibility. So, individual body mechanics 00:23:03.819 --> 00:23:06.579 and proportions really matter? They do. Patellar 00:23:06.579 --> 00:23:09.119 tendinopathy, jumper's knee, is, as the name 00:23:09.119 --> 00:23:12.079 suggests, common in jumping athletes. And things 00:23:12.079 --> 00:23:14.579 like restricted ankle dorsiflexion range might 00:23:14.579 --> 00:23:16.720 actually increase the load on the patellar tendon, 00:23:17.019 --> 00:23:19.559 increasing risk there. Ah, a biomechanical link. 00:23:19.680 --> 00:23:22.250 Yes. And Achilles tendinopathy is strongly associated 00:23:22.250 --> 00:23:24.549 with running and jumping activities, classic 00:23:24.549 --> 00:23:26.670 overuse scenarios for that big energy storing 00:23:26.670 --> 00:23:29.269 tendon. Are there other, perhaps less commonly 00:23:29.269 --> 00:23:32.670 known, factors mentioned as contributing to tendinopathy 00:23:32.670 --> 00:23:36.190 risk, systemic things? Yes. The sources briefly 00:23:36.190 --> 00:23:38.789 touch on several important systemic or medication 00:23:38.789 --> 00:23:41.150 -related factors. Drug -induced tendinopathy, 00:23:41.269 --> 00:23:43.809 for instance. From medication? Yes, it can occur 00:23:43.809 --> 00:23:46.549 with certain medication. Notably, fluoroquinolone 00:23:46.549 --> 00:23:49.880 antibiotics, but also corticosteroids, statins 00:23:49.880 --> 00:23:53.099 used for cholesterol, and anabolic steroids. 00:23:53.359 --> 00:23:55.980 Good to know. Systemic diseases like lupus can 00:23:55.980 --> 00:23:58.519 also be associated with tendon issues, sometimes 00:23:58.519 --> 00:24:01.799 presenting as Achilles tendonopathy. Foot structure 00:24:01.799 --> 00:24:04.119 and range of motion are mentioned as potential 00:24:04.119 --> 00:24:07.200 biomechanical risk factors for lower limb overuse 00:24:07.200 --> 00:24:10.099 injuries. Makes sense. And interestingly, conditions 00:24:10.099 --> 00:24:12.920 like gout, which involves high uric acid levels, 00:24:13.380 --> 00:24:16.349 are being investigated. The inflammatory response 00:24:16.349 --> 00:24:18.710 mediated by a specific signaling molecule in 00:24:18.710 --> 00:24:21.490 gout, IL -1, might potentially interfere with 00:24:21.490 --> 00:24:23.930 normal tendon homeostasis and repair processes. 00:24:24.170 --> 00:24:27.250 Gout affecting tendons. That's unexpected. So 00:24:27.250 --> 00:24:29.509 the risk profile is incredibly broad then. Everything 00:24:29.509 --> 00:24:32.250 from our age and genes to the specific way we 00:24:32.250 --> 00:24:34.990 move, medications we might take, and even underlying 00:24:34.990 --> 00:24:37.549 systemic health conditions. It really is multifactorial. 00:24:37.690 --> 00:24:40.009 Once an injury or tendinopathy is suspected, 00:24:40.109 --> 00:24:42.190 how do clinicians figure out exactly what's going 00:24:42.190 --> 00:24:45.099 on? The sources cover quite a of diagnostic approaches, 00:24:45.339 --> 00:24:48.180 from imaging to physical tests. Yes, imaging 00:24:48.180 --> 00:24:50.859 plays a critical role, but it's really important 00:24:50.859 --> 00:24:52.940 to understand the strengths and limitations of 00:24:52.940 --> 00:24:55.640 each modality, based on what the sources describe. 00:24:56.259 --> 00:24:58.720 Plain x -rays, for example. X -rays, okay. What 00:24:58.720 --> 00:25:00.680 are they good for here? Well, they're limited 00:25:00.680 --> 00:25:03.220 for visualizing soft tissues like muscles and 00:25:03.220 --> 00:25:06.039 tendons directly, but they are invaluable for 00:25:06.039 --> 00:25:08.819 seeing bony structures. Right, bones show up 00:25:08.819 --> 00:25:11.720 well. Exactly. So they're used to check for bony 00:25:11.720 --> 00:25:13.980 avulsion fractures where a tendon is pulled off 00:25:13.980 --> 00:25:16.980 a piece of bone, look for spurs or calcifications, 00:25:17.779 --> 00:25:19.980 assess overall skeletal alignment, check for 00:25:19.980 --> 00:25:22.779 asymmetry, or examine growth plates in apophysitis 00:25:22.779 --> 00:25:24.759 in younger patients where tendon attachments 00:25:24.759 --> 00:25:27.519 to bone can be vulnerable. So good for the bone 00:25:27.519 --> 00:25:29.779 connection, less so for the soft tissue itself. 00:25:29.900 --> 00:25:31.779 What about ultrasound? That seems more suited 00:25:31.779 --> 00:25:33.920 to soft tissue. Ultrasound is highlighted as 00:25:33.920 --> 00:25:35.920 a really valuable tool, particularly because 00:25:35.920 --> 00:25:38.299 it's dynamic. Dynamic. You mean you can see things 00:25:38.299 --> 00:25:40.920 move. Yes, exactly. You can assess tissues in 00:25:40.920 --> 00:25:43.160 motion, which is crucial for some conditions. 00:25:43.720 --> 00:25:46.319 This allows checking for elongation or dislocation 00:25:46.319 --> 00:25:49.380 of tendon bundles during movement, tendon subluxation 00:25:49.380 --> 00:25:50.880 slipping out of place or something like snapping 00:25:50.880 --> 00:25:54.019 hip syndrome. OK. It can show clear structural 00:25:54.019 --> 00:25:57.160 abnormalities like fiber discontinuity, altered 00:25:57.160 --> 00:25:59.599 echogenicity. That's how the tissue reflects 00:25:59.599 --> 00:26:01.819 sound waves, indicating changes in structure. 00:26:01.920 --> 00:26:05.029 Right. Hypervascularity, which often signifies 00:26:05.029 --> 00:26:07.869 unstable scar tissue, or a failed healing attempt, 00:26:08.369 --> 00:26:10.869 or fluid around the lesion. It's excellent for 00:26:10.869 --> 00:26:12.789 superficial structures, like those in the hand 00:26:12.789 --> 00:26:15.769 and wrist. Very useful for diagnosing conditions 00:26:15.769 --> 00:26:18.789 like trigger finger or Decorvain's tenosynovitis. 00:26:19.089 --> 00:26:21.930 And Doppler can share blood flow? Yes. Color 00:26:21.930 --> 00:26:24.130 or power Doppler can be added to assess blood 00:26:24.130 --> 00:26:26.730 flow, highlighting the presence of that neovascularity 00:26:26.730 --> 00:26:28.710 we mentioned earlier. But it's not perfect, right? 00:26:28.710 --> 00:26:32.700 It must have limitations. Yes, definitely. Acoustic 00:26:32.700 --> 00:26:35.319 shadowing from dense scar tissue especially after 00:26:35.319 --> 00:26:37.980 surgery like an Achilles repair can completely 00:26:37.980 --> 00:26:41.190 obscure the view deeper to the scar. Depth penetration 00:26:41.190 --> 00:26:43.490 can also be limited for assessing deeper muscles, 00:26:44.109 --> 00:26:46.069 particularly in larger individuals. Makes sense. 00:26:46.250 --> 00:26:48.670 And critically, the source notes that the accuracy 00:26:48.670 --> 00:26:51.529 and diagnostic yield of ultrasound are highly 00:26:51.529 --> 00:26:53.849 dependent on the skill and experience of the 00:26:53.849 --> 00:26:56.289 examiner performing the scan. Ah, so it's very 00:26:56.289 --> 00:26:58.789 operator dependent. That's key. What about MRI? 00:26:59.029 --> 00:27:01.210 That's often seen as the gold standard for soft 00:27:01.210 --> 00:27:03.450 tissue, isn't it? Magnetic resonance imaging, 00:27:03.750 --> 00:27:06.430 yes. It's described as a multi -parametric tool. 00:27:06.910 --> 00:27:09.150 It provides excellent detail for assessing deeper 00:27:09.150 --> 00:27:11.829 muscles and detecting even minimal changes within 00:27:11.829 --> 00:27:14.210 the tissue that might not be visible on ultrasound. 00:27:14.430 --> 00:27:17.130 High sensitivity. Very high. The sources cited 00:27:17.130 --> 00:27:19.869 sensitivity is 92 % for detecting non -structural 00:27:19.869 --> 00:27:23.349 injuries like muscle edema or minor tears. MRI 00:27:23.349 --> 00:27:26.049 shows characteristic signal changes representing 00:27:26.049 --> 00:27:29.509 pathology like edema, hemorrhage, bleeding, and 00:27:29.509 --> 00:27:31.599 hematoma collection of blood. It can clearly 00:27:31.599 --> 00:27:34.240 depict fiber discontinuity or complete rupture 00:27:34.240 --> 00:27:37.279 and quantify muscle retraction, which you often 00:27:37.279 --> 00:27:39.980 see dramatically in larger gastrocnemius tears 00:27:39.980 --> 00:27:43.019 or hamstring evulsions. It allows comprehensive 00:27:43.019 --> 00:27:45.460 assessment not just of the tendon itself, but 00:27:45.460 --> 00:27:48.599 also its surrounding sheath, any fluid collections, 00:27:49.079 --> 00:27:51.259 and adjacent structures like the bicipital groove 00:27:51.259 --> 00:27:54.960 in the shoulder. And I saw dynamic MRI mentioned 00:27:54.960 --> 00:27:58.140 as particularly useful in certain cases. Absolutely. 00:27:58.619 --> 00:28:00.980 Dynamic MRI, where scans are taken during movement 00:28:00.980 --> 00:28:03.519 or muscle contraction, is crucial for showing 00:28:03.519 --> 00:28:05.680 lesions that might not be visible in a static 00:28:05.680 --> 00:28:08.240 image. Like what kind of lesions? Things like 00:28:08.240 --> 00:28:10.500 certain supraspinatus tendon tears in the shoulder 00:28:10.500 --> 00:28:13.359 or assessing the quadriceps or hamstrings through 00:28:13.359 --> 00:28:15.640 specific ranges of motion and contraction to 00:28:15.640 --> 00:28:18.660 see where pathology occurs. It's also vital for 00:28:18.660 --> 00:28:21.839 visualizing tendon retraction or changes in patellar 00:28:21.710 --> 00:28:24.849 tendon height in chronic rupture situations where 00:28:24.849 --> 00:28:27.049 static imaging might underestimate the problem. 00:28:27.190 --> 00:28:30.230 I see. And MR orthography, where contrast is 00:28:30.230 --> 00:28:32.809 injected into a joint space, can also be useful 00:28:32.809 --> 00:28:34.690 for assessing structures like the long head of 00:28:34.690 --> 00:28:37.250 the biceps tendon or detecting impingement -related 00:28:37.250 --> 00:28:39.650 labral tears in the shoulder. Is CT ever used 00:28:39.650 --> 00:28:41.970 for these soft tissue issues? Seems more for 00:28:41.970 --> 00:28:45.509 bone. CT scans, computed tomography, are primarily 00:28:45.509 --> 00:28:47.750 used for their excellent bony detail, as you 00:28:47.750 --> 00:28:50.349 say. They're valuable for confirming complex 00:28:50.349 --> 00:28:52.849 bony evulsions, such as from the iliac spine 00:28:52.849 --> 00:28:55.789 and hamstring injuries, and for creating detailed 00:28:55.789 --> 00:28:58.809 3D reconstructions of bony anatomy. They can 00:28:58.809 --> 00:29:01.950 also be used, similar to MRI, to assess changes 00:29:01.950 --> 00:29:04.369 in patellar tendon height in chronic rupture 00:29:04.369 --> 00:29:06.829 when bony landmarks are important references. 00:29:07.259 --> 00:29:09.859 And there's a mention of some newer imaging fusion 00:29:09.859 --> 00:29:12.720 technology, combining scans. Yes, the sources 00:29:12.720 --> 00:29:15.380 mention the use of fusion technology. This allows 00:29:15.380 --> 00:29:18.079 for overlaying current ultrasound scans onto 00:29:18.079 --> 00:29:20.640 previous MRI scans. Well, that sounds useful. 00:29:20.839 --> 00:29:22.700 It's particularly useful during follow -up appointments. 00:29:22.859 --> 00:29:24.960 It enables clinicians to superimpose the real 00:29:24.960 --> 00:29:27.799 -time ultrasound view onto the baseline MRI to 00:29:27.799 --> 00:29:30.339 clearly demonstrate any changes over time, or 00:29:30.339 --> 00:29:32.740 perhaps to precisely target interventions based 00:29:32.740 --> 00:29:35.700 on the MRI findings. Very clever. Beyond imaging, 00:29:36.019 --> 00:29:38.319 physical examination tests are also clearly key 00:29:38.319 --> 00:29:40.339 to diagnosis, aren't they? You don't just rely 00:29:40.339 --> 00:29:44.140 on the scans. Definitely not. No. A thorough 00:29:44.140 --> 00:29:47.079 physical examination is crucial and really goes 00:29:47.079 --> 00:29:50.079 hand in hand with imaging. The sources mention 00:29:50.079 --> 00:29:52.759 specific physical exam tests associated with 00:29:52.759 --> 00:29:54.980 different conditions, and these are woven into 00:29:54.980 --> 00:29:57.440 the discussion of specific areas. For example? 00:29:57.539 --> 00:30:00.180 Well, for example, the Finkelstein test. This 00:30:00.180 --> 00:30:02.599 involves specific wrist movements to stretch 00:30:02.599 --> 00:30:05.380 the tendons involved in decrevain's disease and 00:30:05.380 --> 00:30:08.839 illicit pain. For assessing the long head of 00:30:08.839 --> 00:30:11.579 the biceps tendon in the shoulder, tests like 00:30:11.579 --> 00:30:14.640 speeds, urgesons, and the three -pack exam are 00:30:14.640 --> 00:30:17.460 used to illicit pain or assess the tendon stability 00:30:17.460 --> 00:30:20.680 in its groove. And the visible bulge, often referred 00:30:20.680 --> 00:30:23.940 to as the Popeye sign. Ah, yes, the Popeye sign. 00:30:24.059 --> 00:30:26.400 It's a classic, though sometimes subtle, indicator 00:30:26.400 --> 00:30:28.619 of a complete biceps rupture. I've certainly 00:30:28.619 --> 00:30:30.880 heard of that, a very distinctive physical finding. 00:30:31.059 --> 00:30:34.319 It is. In the lower limb, for issues like tibialis, 00:30:34.339 --> 00:30:37.119 posterior insufficiency, important clinical signs 00:30:37.119 --> 00:30:39.359 include the too many toes sign, where you can 00:30:39.359 --> 00:30:41.160 see more toes from behind the patient due to 00:30:41.160 --> 00:30:43.400 the foot collapsing outwards, the heel rise test 00:30:43.400 --> 00:30:46.180 to assess muscle function, and the first metatarsal 00:30:46.180 --> 00:30:49.319 rise sign. These clinical tests, described in 00:30:49.319 --> 00:30:51.859 the sources, help clinicians pinpoint the likely 00:30:51.859 --> 00:30:54.759 problem area and guide subsequent imaging or 00:30:54.759 --> 00:30:57.440 treatment decisions. So it's really a combination 00:30:57.440 --> 00:30:59.859 of the patient's history, a skilled physical 00:30:59.859 --> 00:31:02.200 exam, and appropriate imaging that's needed to 00:31:02.200 --> 00:31:04.460 get a full, accurate picture of what's going 00:31:04.460 --> 00:31:07.000 on. Absolutely. You need all those pieces. Once 00:31:07.000 --> 00:31:10.019 a diagnosis is made, how do we approach treatment? 00:31:10.349 --> 00:31:13.309 The sources clearly discuss balancing conservative 00:31:13.309 --> 00:31:16.109 and surgical options. That's absolutely the overarching 00:31:16.109 --> 00:31:18.730 principle, yes. The decision -making process 00:31:18.730 --> 00:31:21.990 depends heavily on the injury severity, its specific 00:31:21.990 --> 00:31:24.309 location, and of course the patient's individual 00:31:24.309 --> 00:31:26.509 needs, functional goals, and overall health. 00:31:26.890 --> 00:31:28.769 Let's start with conservative management then. 00:31:29.029 --> 00:31:31.049 This seems to be the first line of defense for 00:31:31.049 --> 00:31:33.549 many conditions, particularly tendinopathies, 00:31:33.849 --> 00:31:36.470 and the sources heavily emphasize load management 00:31:36.470 --> 00:31:39.410 as a core principle here. Lowe's management is 00:31:39.410 --> 00:31:42.250 presented as absolutely key, particularly in 00:31:42.250 --> 00:31:44.789 the initial phases of what's sometimes termed 00:31:44.789 --> 00:31:47.329 reactive tendinopathy, that sort of acute overload 00:31:47.329 --> 00:31:50.509 response. Reactive tendinopathy, okay. This involves 00:31:50.509 --> 00:31:53.069 carefully modifying the activity that aggravated 00:31:53.069 --> 00:31:55.789 the tendon to reduce symptoms while still allowing 00:31:55.789 --> 00:31:58.410 tissue adaptation. But here's a really important 00:31:58.410 --> 00:32:01.529 point the source of stress. Complete rest from 00:32:01.529 --> 00:32:04.690 tensile load is often contraindicated. Contraindicated, 00:32:04.809 --> 00:32:07.769 so not advised. Exactly. While it might feel 00:32:07.769 --> 00:32:11.210 intuitive to stop using the painful tendon entirely, 00:32:11.670 --> 00:32:14.990 prolonged, complete rest actually decreases the 00:32:14.990 --> 00:32:17.089 tendon's mechanical strength and capacity over 00:32:17.089 --> 00:32:20.829 time. It deconditions it. So rest isn't necessarily 00:32:21.099 --> 00:32:23.559 best, at least not complete, unloaded rest for 00:32:23.559 --> 00:32:26.299 the tendon itself. Precisely. The goal of modifying 00:32:26.299 --> 00:32:28.619 load is to reduce painful activities, especially 00:32:28.619 --> 00:32:31.019 those high -load energy storage activities, think 00:32:31.019 --> 00:32:33.460 jumping, hopping, throwing, rapid changes of 00:32:33.460 --> 00:32:36.000 direction. It also means reducing compressive 00:32:36.000 --> 00:32:38.299 loads, which often occur when muscles are used 00:32:38.299 --> 00:32:40.539 in their outer ranges of motion, potentially 00:32:40.539 --> 00:32:42.720 compressing the tendon against underlying bone. 00:32:43.319 --> 00:32:45.279 The focus is on maintaining some appropriate 00:32:45.279 --> 00:32:47.799 load to stimulate adaptation and healing, just 00:32:47.799 --> 00:32:50.480 at a level the tissue can tolerate. Right. Finding 00:32:50.480 --> 00:32:52.700 that sweet spot of loading. How does exercise 00:32:52.700 --> 00:32:55.240 fit into this load management strategy then? 00:32:56.000 --> 00:32:58.339 Exercise progression is really the cornerstone 00:32:58.339 --> 00:33:01.099 of rehabilitation for most muscle and tendon 00:33:01.099 --> 00:33:04.119 injuries and tendinopathies. The sources describe 00:33:04.119 --> 00:33:06.940 a phased approach. Phased approach, like starting 00:33:06.940 --> 00:33:09.740 simple. Yes. Typically starting with simpler 00:33:09.740 --> 00:33:11.740 weight -bearing exercises, if it's the lower 00:33:11.740 --> 00:33:15.140 limb, like squats, step -downs, lunges, performed 00:33:15.140 --> 00:33:17.240 at appropriate speeds that don't provoke pain. 00:33:17.400 --> 00:33:19.599 Okay. As the tendon's load tolerance increases 00:33:19.599 --> 00:33:22.099 and symptoms settle, you progressively increase 00:33:22.099 --> 00:33:24.680 the intensity. which often means increasing the 00:33:24.680 --> 00:33:27.000 speed of movement, moving towards more rapid 00:33:27.000 --> 00:33:29.900 or plyometric actions. Building up the demand. 00:33:30.059 --> 00:33:32.839 Exactly. The final phase then shifts to highly 00:33:32.839 --> 00:33:36.079 specific, functional, and sport -specific activities, 00:33:36.539 --> 00:33:38.359 gradually returning the patient to their desired 00:33:38.359 --> 00:33:41.000 level of function and performance. The whole 00:33:41.000 --> 00:33:43.059 process is designed to gradually increase the 00:33:43.059 --> 00:33:45.900 tendon's capacity to handle load. And monitoring 00:33:45.900 --> 00:33:48.380 that load seems particularly crucial when someone 00:33:48.380 --> 00:33:50.460 is returning to sport or high -level activity 00:33:50.460 --> 00:33:54.240 to avoid setbacks. It is vital, absolutely vital 00:33:54.240 --> 00:33:56.720 to prevent recurrence. The sources mention the 00:33:56.720 --> 00:33:59.220 concept of the acute to chronic workload ratio. 00:33:59.480 --> 00:34:02.240 Acute to chronic workload ratio. Yes, popularized 00:34:02.240 --> 00:34:05.000 by Blanche and Gabbitt. It's presented as a useful 00:34:05.000 --> 00:34:07.400 tool for monitoring load, especially when athletes 00:34:07.400 --> 00:34:09.800 are returning to sport after rehab. Training 00:34:09.800 --> 00:34:13.079 intensity during rehabilitation is usually significantly 00:34:13.079 --> 00:34:15.300 lower than normal training. Right, of course. 00:34:15.380 --> 00:34:17.559 So the return to full activity must be carefully 00:34:17.559 --> 00:34:20.789 managed and gradual. Avoid rapidly overloading 00:34:20.789 --> 00:34:23.150 the recovering tissue, which is a very common 00:34:23.150 --> 00:34:26.530 case of re -injury. gradual return is key. What 00:34:26.530 --> 00:34:28.909 about other physical therapy modalities, things 00:34:28.909 --> 00:34:32.630 like therapeutic ultrasound, massage, laser therapy? 00:34:33.090 --> 00:34:35.230 Are they supported by the evidence in the sources? 00:34:35.550 --> 00:34:37.829 Well, the sources are quite clear. The evidence 00:34:37.829 --> 00:34:40.469 base for many of these sort of passive modalities, 00:34:40.610 --> 00:34:43.869 including low level laser therapy, LLLT, ion 00:34:43.869 --> 00:34:45.849 to phoresis using electrical current to drive 00:34:45.849 --> 00:34:48.750 medication and therapeutic ultrasound, deep friction 00:34:48.750 --> 00:34:52.150 massage is often limited or conflicting or simply 00:34:52.150 --> 00:34:54.889 not robust enough to strongly support their widespread 00:34:54.889 --> 00:34:57.889 use for promoting actual tissue healing and tendinopathy. 00:34:58.230 --> 00:35:00.329 So limited evidence for those passive treatments? 00:35:00.909 --> 00:35:05.329 Generally, yes. Similarly, while exercises aimed 00:35:05.329 --> 00:35:08.250 at proprioception, that's awareness of body position 00:35:08.250 --> 00:35:10.630 and general stability are often included in rehab 00:35:10.630 --> 00:35:13.710 programs, the sources review these and note a 00:35:13.710 --> 00:35:16.010 lack of strong positive evidence in some specific 00:35:16.010 --> 00:35:19.510 areas. However, the idea of conscious control 00:35:19.510 --> 00:35:23.269 of movement to perhaps reduce potentially Detrimental 00:35:23.269 --> 00:35:25.489 variability in loading patterns is still discussed, 00:35:26.110 --> 00:35:28.530 suggesting an external focus during exercises 00:35:28.530 --> 00:35:30.769 might be beneficial. So perhaps a less emphasis 00:35:30.769 --> 00:35:33.510 on specific techniques and more on the fundamental 00:35:33.510 --> 00:35:35.570 principles of controlled movement and progressive 00:35:35.570 --> 00:35:38.570 load. What role do medications play in managing 00:35:38.570 --> 00:35:41.110 these conditions? Medications are primarily for 00:35:41.110 --> 00:35:43.110 symptom management, particularly pain relief. 00:35:44.250 --> 00:35:46.849 NSAIDs, non -steroidal anti -inflammatories like 00:35:46.849 --> 00:35:49.590 ibuprofen or naproxen. Right. They can provide 00:35:49.590 --> 00:35:51.489 short -term pain relief, which might help a patient 00:35:51.489 --> 00:35:53.469 participate in their rehabilitation program. 00:35:54.369 --> 00:35:57.010 However, the sources find no evidence that NSAIDs 00:35:57.010 --> 00:35:59.190 actually promote tendon healing itself. Just 00:35:59.190 --> 00:36:01.630 pain relief, not healing. What about injections, 00:36:02.429 --> 00:36:05.250 corticosteroids? Corticosteroid injections can 00:36:05.250 --> 00:36:07.849 provide good short -term pain relief, typically 00:36:07.849 --> 00:36:10.650 for up to about six weeks. This can be very helpful, 00:36:10.650 --> 00:36:14.389 say, for persistent lateral epicondylitis to 00:36:14.389 --> 00:36:16.309 allow someone to engage in physical therapy. 00:36:16.349 --> 00:36:19.469 OK. A window of opportunity. Exactly. But they 00:36:19.469 --> 00:36:22.650 do not offer a long -term benefit. And crucially, 00:36:23.090 --> 00:36:25.130 they're associated with an increased risk of 00:36:25.130 --> 00:36:27.750 tendon rupture and recurrence of symptoms. Increased 00:36:27.750 --> 00:36:30.690 risk of rupture. That's concerning. It is. Therefore, 00:36:30.869 --> 00:36:33.570 the sources advise caution with their use, especially 00:36:33.570 --> 00:36:36.449 repeated injections. Neutraceuticals. things 00:36:36.449 --> 00:36:38.909 like compounds derived from plants such as bromelain, 00:36:39.130 --> 00:36:41.809 curcumin, boswellic acid, or supplements like 00:36:41.809 --> 00:36:44.690 chondroitin sulfate. They're mentioned as a relatively 00:36:44.690 --> 00:36:47.849 new area of study, often investigated in combinations, 00:36:48.250 --> 00:36:50.809 but the evidence is still emerging. So conservative 00:36:50.809 --> 00:36:53.349 management is primarily about intelligent load 00:36:53.349 --> 00:36:55.789 management, structured progressive exercise, 00:36:55.949 --> 00:36:58.650 and careful pain control, with caution advised 00:36:58.650 --> 00:37:01.130 for some pharmacological interventions, especially 00:37:01.130 --> 00:37:04.130 steroids. When does surgery enter the picture? 00:37:04.320 --> 00:37:06.719 When do you move beyond conservative approaches? 00:37:07.179 --> 00:37:09.500 Surgery is generally considered for more severe 00:37:09.500 --> 00:37:13.360 injuries, specific structural problems, or when 00:37:13.360 --> 00:37:15.800 a comprehensive, well -executed conservative 00:37:15.800 --> 00:37:18.780 management program has failed to achieve satisfactory 00:37:18.780 --> 00:37:21.719 results after an appropriate period, say three 00:37:21.719 --> 00:37:24.559 to six months or more. Okay. What kind of things 00:37:24.559 --> 00:37:27.659 warrant surgery? Indications include complete 00:37:27.659 --> 00:37:30.539 ruptures, such as a complete tear of the patellar 00:37:30.539 --> 00:37:33.980 tendon, quadriceps tendon, or hamstring avulsions, 00:37:34.519 --> 00:37:36.400 where the tendon is pulled completely off the 00:37:36.400 --> 00:37:39.000 bone with significant retraction, often defined 00:37:39.000 --> 00:37:41.579 as more than two centimeters. Right. Big tears 00:37:41.579 --> 00:37:45.519 or detachments. Yes. Large intramuscular hematomas 00:37:45.519 --> 00:37:47.460 that aren't resolving can also sometimes require 00:37:47.460 --> 00:37:50.239 surgical drainage. Certain chronic conditions 00:37:50.239 --> 00:37:53.500 respond poorly to conservative care, like stenosing 00:37:53.500 --> 00:37:56.079 tenosynovitis trigger finger to crevains where 00:37:56.079 --> 00:37:57.980 the tendon sheath has thickened, restricting 00:37:57.980 --> 00:38:00.820 movement. For chronic compartment syndrome, where 00:38:00.820 --> 00:38:02.960 pressure builds dangerously within a muscle compartment 00:38:02.960 --> 00:38:06.039 during exercise, fasciotomy, surgically releasing 00:38:06.039 --> 00:38:08.219 the fascial sheath, is often the treatment of 00:38:08.219 --> 00:38:10.539 choice. Those success rates can vary depending 00:38:10.539 --> 00:38:12.980 on the specific compartment involved. Peroneal 00:38:12.980 --> 00:38:15.739 tendon tears or dislocations in the ankle area 00:38:15.739 --> 00:38:18.860 rarely heal spontaneously due to mechanical factors, 00:38:19.320 --> 00:38:22.460 so surgery is often required there. And finally, 00:38:22.699 --> 00:38:24.920 some chronic tenonopathies that remain debilitating 00:38:24.920 --> 00:38:28.019 despite appropriate eccentric exercise programs 00:38:28.019 --> 00:38:30.880 may also be surgical candidates, though this 00:38:30.880 --> 00:38:33.119 is perhaps less common than for acute ruptures. 00:38:33.599 --> 00:38:36.039 What are some of the specific surgical procedures 00:38:36.039 --> 00:38:38.139 mentioned in the sources for these different 00:38:38.139 --> 00:38:41.159 issues? Well, the sources describe quite a variety 00:38:41.159 --> 00:38:43.380 of procedures depending on the specific problem. 00:38:44.260 --> 00:38:46.880 Tenorophy is the term for surgically repairing 00:38:46.880 --> 00:38:49.780 a torn tendon, stitching the ends back together. 00:38:50.000 --> 00:38:53.000 Tenorophy. Got it. Muscle evulsion repair involves 00:38:53.000 --> 00:38:55.559 reattaching a muscle tendon unit that is pulled 00:38:55.559 --> 00:38:58.480 away from its bony insertion. The sources note 00:38:58.480 --> 00:39:00.980 that early repair generally leads to better functional 00:39:00.980 --> 00:39:03.539 outcomes. Early repair is better. Generally, 00:39:03.719 --> 00:39:05.880 yes. For the long head of the biceps and the 00:39:05.880 --> 00:39:08.139 shoulder, procedures like tenodesis cutting the 00:39:08.139 --> 00:39:10.239 tendon and reattaching it elsewhere, usually 00:39:10.239 --> 00:39:12.480 lower down or tonotomy simply cutting the tendon, 00:39:12.639 --> 00:39:15.360 are discussed. Studies show potential differences 00:39:15.360 --> 00:39:17.559 in strength outcomes and the likelihood of that 00:39:17.559 --> 00:39:20.610 Popeye sign occurring. Debridement involves surgically 00:39:20.610 --> 00:39:22.869 removing degenerative or damaged tissue from 00:39:22.869 --> 00:39:25.949 within a tendon. Seen for Achilles, patellar, 00:39:26.030 --> 00:39:28.730 and peroneal tendons, augmentation procedures 00:39:28.730 --> 00:39:32.329 use grafts. Grafts, like adding tissue? Yes, 00:39:32.449 --> 00:39:34.969 either autologous from the patient's own body, 00:39:35.510 --> 00:39:38.250 allogeneic from a donor, or sometimes synthetic 00:39:38.250 --> 00:39:41.070 mesh. These are used to renaforce repairs when 00:39:41.070 --> 00:39:43.309 there's insufficient native tendon substance, 00:39:43.590 --> 00:39:46.030 perhaps for large quadriceps ruptures. Okay. 00:39:46.170 --> 00:39:48.269 Release procedures involve surgically cutting 00:39:48.269 --> 00:39:50.590 structures that are constricting tendons, like 00:39:50.590 --> 00:39:53.150 the A1 poly and Kruger finger, which can be done 00:39:53.150 --> 00:39:56.150 percutaneously with a needle or openly, or releasing 00:39:56.150 --> 00:39:58.650 structures like the IT band or the popliteus 00:39:58.650 --> 00:40:01.889 tendon in certain syndromes, fasciotomy for CECS, 00:40:01.909 --> 00:40:05.429 as we mentioned, and tendoscopy. Like keyhole 00:40:05.429 --> 00:40:08.730 surgery for tendons. Exactly. A minimally invasive 00:40:08.730 --> 00:40:11.119 technique using an endoscope. It can be used 00:40:11.119 --> 00:40:13.659 for debridement or synovectomy, removing the 00:40:13.659 --> 00:40:15.760 inflamed lining of the tendon sheath, in areas 00:40:15.760 --> 00:40:18.300 like the tibialis, posterior, or anterior. That's 00:40:18.300 --> 00:40:20.300 quite a comprehensive list of interventions. 00:40:20.519 --> 00:40:23.139 And I imagine postoperative management and rehabilitation 00:40:23.139 --> 00:40:25.380 is just as critical as the surgery itself for 00:40:25.380 --> 00:40:27.579 determining the final outcome. Oh, absolutely. 00:40:28.260 --> 00:40:30.320 Postoperative management and rehabilitation are 00:40:30.320 --> 00:40:33.159 paramount. There's still some variation in surgical 00:40:33.159 --> 00:40:35.539 protocols regarding immediate post -op management, 00:40:35.980 --> 00:40:38.539 balancing strict immobilization versus early 00:40:38.539 --> 00:40:41.239 controlled motion. The immobilize versus move 00:40:41.239 --> 00:40:45.300 early debate. Exactly. However, the sources highlight 00:40:45.300 --> 00:40:48.239 evidence, particularly from animal studies, suggesting 00:40:48.239 --> 00:40:50.739 that early controlled mobilization generally 00:40:50.739 --> 00:40:53.239 enhances healing and decreases the formation 00:40:53.239 --> 00:40:55.860 of restrictive adhesions compared to prolonged 00:40:55.860 --> 00:40:59.300 immobilization. So moving early helps? Controlled 00:40:59.300 --> 00:41:01.820 movement, yes. Applying controlled load early 00:41:01.820 --> 00:41:04.059 in the healing phase seems to support the regeneration 00:41:04.059 --> 00:41:07.199 and remodeling of the extracellular matrix. The 00:41:07.199 --> 00:41:08.940 sources even mention a randomized controlled 00:41:08.940 --> 00:41:11.079 trial, showing that functional weight bearing 00:41:11.079 --> 00:41:13.360 enhanced the early healing response in Achilles' 00:41:13.500 --> 00:41:16.340 rupture repairs. It's a delicate balance, of 00:41:16.340 --> 00:41:18.900 course, but early, protected loading is often 00:41:18.900 --> 00:41:21.039 preferred over prolonged immobilization these 00:41:21.039 --> 00:41:23.599 days. A key point reinforced in the sources, 00:41:23.659 --> 00:41:26.179 however, is that even a successfully surgically 00:41:26.179 --> 00:41:29.719 healed tendon rarely, if ever, fully regains 00:41:29.719 --> 00:41:31.579 the original strength and mechanical properties 00:41:31.579 --> 00:41:34.199 of the native, uninjured tendon. That's a very 00:41:34.199 --> 00:41:36.159 important expectation to manage for patients 00:41:36.159 --> 00:41:38.840 undergoing surgery. So we've covered the basics, 00:41:39.119 --> 00:41:42.159 mechanics, injuries, diagnosis, and the established 00:41:42.159 --> 00:41:45.019 treatments. But there's also this growing, exciting 00:41:45.019 --> 00:41:47.739 area of newer, more biological treatments aimed 00:41:47.739 --> 00:41:49.880 at optimizing healing, aren't there? Yes, this 00:41:49.880 --> 00:41:52.880 is a rapidly evolving field, really focusing 00:41:52.880 --> 00:41:55.739 on harnessing the body's own healing mechanisms 00:41:55.739 --> 00:41:58.960 or introducing biological factors to enhance 00:41:58.960 --> 00:42:01.980 tissue repair, particularly for chronic or complex 00:42:01.980 --> 00:42:04.690 cases that perhaps don't respond well to traditional 00:42:04.690 --> 00:42:08.849 approaches. Platelet -rich plasma, or PRP, is 00:42:08.849 --> 00:42:11.510 one such approach that's gained significant attention 00:42:11.510 --> 00:42:14.130 and use. PRP. Yes, we hear about this a lot, 00:42:14.469 --> 00:42:16.449 especially in sports medicine. How does it actually 00:42:16.449 --> 00:42:18.889 work, according to the sources? Well, PRP is 00:42:18.889 --> 00:42:21.099 derived from the patient's own blood. A sample 00:42:21.099 --> 00:42:23.599 of venous blood is taken and processed, usually 00:42:23.599 --> 00:42:25.880 by centrifugation, to concentrate the platelets 00:42:25.880 --> 00:42:29.960 into a small volume of plasma. The key is that 00:42:29.960 --> 00:42:32.079 activated platelets release a powerful cocktail 00:42:32.079 --> 00:42:35.239 of growth factors and structural proteins. The 00:42:35.239 --> 00:42:37.840 sources list several key ones. Platelet -derived 00:42:37.840 --> 00:42:41.079 growth factor, PDGF. transforming growth factor 00:42:41.079 --> 00:42:46.159 beta PGFA, insulin -like growth factor IGF, fibroblast 00:42:46.159 --> 00:42:50.280 growth factor FGF, epidermal growth factor EGF, 00:42:50.739 --> 00:42:54.300 and hepatocyte growth factor HGF. A whole alphabet 00:42:54.300 --> 00:42:57.239 soup of growth factors. Indeed, along with structural 00:42:57.239 --> 00:42:59.940 proteins like fibrin, fibrinectin, and vitrinectin. 00:43:00.039 --> 00:43:02.480 These factors have several potentially beneficial 00:43:02.480 --> 00:43:04.980 effects. They enhance DNA synthesis in local 00:43:04.980 --> 00:43:07.659 cells, promote chemotaxis, which is attracting 00:43:07.659 --> 00:43:10.099 essential healing cells to the injury site, calling 00:43:10.099 --> 00:43:13.559 in the repair crew. Exactly. They stimulate angiogenesis, 00:43:13.659 --> 00:43:15.840 the formation of new blood vessels, crucial for 00:43:15.840 --> 00:43:18.260 bringing nutrients and cells, and they increase 00:43:18.260 --> 00:43:20.579 the deposition of collagen and other extracellular 00:43:20.579 --> 00:43:23.079 matrix components necessary for tissue repair. 00:43:23.340 --> 00:43:25.380 So it's essentially delivering a concentrated 00:43:25.380 --> 00:43:27.699 dose of the body's own healing signals directly 00:43:27.699 --> 00:43:30.369 to the injured area. Precisely. That's the idea. 00:43:30.989 --> 00:43:33.110 And importantly, the sources note that these 00:43:33.110 --> 00:43:35.269 growth factors are released very rapidly upon 00:43:35.269 --> 00:43:38.090 platelet activation, about 70 % within the first 00:43:38.090 --> 00:43:41.469 10 minutes and nearly 100 % within an hour. Wow, 00:43:41.670 --> 00:43:45.329 quick release. Yes. PRP's increasing use is particularly 00:43:45.329 --> 00:43:47.570 relevant in tissues like tendons, which often 00:43:47.570 --> 00:43:50.449 have a relatively poor blood supply. meaning 00:43:50.449 --> 00:43:52.469 the natural delivery of healing factors might 00:43:52.469 --> 00:43:55.170 be limited. While evidence is still accumulating 00:43:55.170 --> 00:43:57.449 and robust trials are awaited in some specific 00:43:57.449 --> 00:44:00.010 applications, it's certainly being explored and 00:44:00.010 --> 00:44:03.059 used for both muscle and tendon repair. Are specific 00:44:03.059 --> 00:44:05.219 individual growth factors also being studied 00:44:05.219 --> 00:44:07.320 for their potential intended repair separate 00:44:07.320 --> 00:44:10.500 from the mix you get in PRP? Yes. Well, PRP provides 00:44:10.500 --> 00:44:12.980 that broad spectrum of factors, specific individual 00:44:12.980 --> 00:44:16.539 growth factors like HDF, RHP, GDF, BB, which 00:44:16.539 --> 00:44:19.780 is a predominant form of PDGF, IL -6, intralucin 00:44:19.780 --> 00:44:23.699 -6, TGFV, and various BMPs, bone morphogenetic 00:44:23.699 --> 00:44:26.199 proteins known for bone healing but also involved 00:44:26.199 --> 00:44:28.329 in soft tissue. They are being studied for their 00:44:28.329 --> 00:44:30.010 effects on tendon repair. But more experimental. 00:44:30.150 --> 00:44:32.550 Much of this research is currently in anal models 00:44:32.550 --> 00:44:35.190 or early clinical trials. Yes. The results can 00:44:35.190 --> 00:44:37.309 be promising for stimulating certain aspects 00:44:37.309 --> 00:44:40.269 of healing, but they require much further clinical 00:44:40.269 --> 00:44:42.670 investigation to determine their overall effectiveness 00:44:42.670 --> 00:44:45.530 and safety in human patients compared to other 00:44:45.530 --> 00:44:47.769 treatments. And what about stem cells? That's 00:44:47.769 --> 00:44:49.630 another area often discussed in regenerative 00:44:49.630 --> 00:44:52.010 medicine circles. Misenchymal stromal cells. 00:44:52.239 --> 00:44:55.780 or MSCs, often referred to as stem cells in this 00:44:55.780 --> 00:44:58.480 context, are being explored for their potential 00:44:58.480 --> 00:45:01.059 intended healing. This is based on their ability 00:45:01.059 --> 00:45:04.320 to proliferate, to multiply, and their immunosuppressive 00:45:04.320 --> 00:45:06.539 properties, which could potentially modulate 00:45:06.539 --> 00:45:08.880 the inflammatory response. Okay. How are they 00:45:08.880 --> 00:45:11.179 being used? They are used in both veterinary 00:45:11.179 --> 00:45:13.539 medicine, particularly in horses, and are being 00:45:13.539 --> 00:45:16.619 investigated in human medicine. However, The 00:45:16.619 --> 00:45:18.639 sources highlight that the optimal conditions 00:45:18.639 --> 00:45:21.659 for effectively inducing genuine tendon healing 00:45:21.659 --> 00:45:25.000 using MSCs, particularly how to introduce them 00:45:25.000 --> 00:45:26.840 into the injury site and guide their behavior, 00:45:27.300 --> 00:45:30.059 are still largely unclear and require significant 00:45:30.059 --> 00:45:32.599 research. Still early days for stem cells and 00:45:32.599 --> 00:45:36.199 tendons then? Relatively, yes. There's also research 00:45:36.199 --> 00:45:38.820 looking specifically at fat -derived stem cells 00:45:38.820 --> 00:45:41.000 and how different factors in their environment 00:45:41.000 --> 00:45:44.239 might influence their morphology and growth patterns 00:45:44.239 --> 00:45:47.280 towards becoming tendon -like cells. So still 00:45:47.280 --> 00:45:50.119 very much an area of active research to optimize 00:45:50.119 --> 00:45:52.420 their application and effectiveness. What if 00:45:52.420 --> 00:45:54.380 the injury is very large where you actually need 00:45:54.380 --> 00:45:57.500 to bridge a significant gap in the tissue? That's 00:45:57.500 --> 00:45:59.980 where biomaterials and scaffolds come into play. 00:46:00.380 --> 00:46:02.780 They could play a crucial role. especially in 00:46:02.780 --> 00:46:05.139 augmenting surgical repairs for large tendon 00:46:05.139 --> 00:46:07.519 defects where there simply isn't enough native 00:46:07.519 --> 00:46:10.199 tissue to stitch together. Scaffolds, okay. Like 00:46:10.199 --> 00:46:12.980 a framework for healing. Exactly. Synthetic scaffolds 00:46:12.980 --> 00:46:15.179 have been developed, but they face challenges. 00:46:15.760 --> 00:46:17.780 Things like perfectly matching the mechanical 00:46:17.780 --> 00:46:20.179 properties of native tendon, ensuring controlled 00:46:20.179 --> 00:46:22.599 degradation over time, and ensuring the body's 00:46:22.599 --> 00:46:24.980 cells interact favorably with the synthetic material. 00:46:25.920 --> 00:46:28.019 Newer synthetic materials aim to transfer load 00:46:28.019 --> 00:46:30.739 gradually to the forming tissue as they slowly 00:46:30.739 --> 00:46:33.090 degrade. And what about scaffolds derived from 00:46:33.090 --> 00:46:35.710 natural tissues? Are they better? These are extracellular 00:46:35.710 --> 00:46:38.989 matrix -derived scaffolds, often from animal 00:46:38.989 --> 00:46:42.090 tissues like pig intestine or dermis. They contain 00:46:42.090 --> 00:46:44.929 native growth factors and proteins, and the hope 00:46:44.929 --> 00:46:47.090 is they can provide a more natural environment 00:46:47.090 --> 00:46:49.949 to induce constructive remodeling by the host 00:46:49.949 --> 00:46:52.869 tissue. Sounds promising. Any drawbacks? Well, 00:46:52.989 --> 00:46:55.369 the source has mentioned a challenge here. FDA 00:46:55.369 --> 00:46:58.599 standards for tissue decellularization and that's 00:46:58.599 --> 00:47:00.599 the process of removing the original animal cells 00:47:00.599 --> 00:47:03.539 from the matrix to reduce immune rejection, are 00:47:03.539 --> 00:47:05.719 not fully established or consistently applied. 00:47:05.869 --> 00:47:08.730 Ah, so variability in the products. Potentially, 00:47:08.809 --> 00:47:11.309 yes. This means commercially available products 00:47:11.309 --> 00:47:13.489 can vary in the amount of remaining antigenic 00:47:13.489 --> 00:47:16.010 material, which could potentially cause unwanted 00:47:16.010 --> 00:47:18.929 immune responses or complications. These scaffolds 00:47:18.929 --> 00:47:20.769 are often used in combination with biological 00:47:20.769 --> 00:47:23.510 treatments like PRP or stem cells. Right, combining 00:47:23.510 --> 00:47:26.829 approaches. Let's shift gears slightly to extracorporeal 00:47:26.829 --> 00:47:30.570 shockwave therapy, or ESWT. This is another non 00:47:30.570 --> 00:47:32.949 -invasive treatment method often used for chronic 00:47:32.949 --> 00:47:37.440 tendinopathy. How does it work? ESWT involves 00:47:37.440 --> 00:47:40.139 applying mechanical shock waves to the affected 00:47:40.139 --> 00:47:43.780 tendon area using a specialized device. The sources 00:47:43.780 --> 00:47:46.079 describe these waves as having a characteristic 00:47:46.079 --> 00:47:49.920 profile, a very fast high amplitude positive 00:47:49.920 --> 00:47:53.400 pressure rise followed by a lower amplitude negative 00:47:53.400 --> 00:47:56.460 pressure phase. Shock waves? Sounds intense. 00:47:56.760 --> 00:47:59.199 How do they help? The proposed mechanisms are 00:47:59.199 --> 00:48:02.340 multifaceted. It's thought to have a direct analgesic 00:48:02.340 --> 00:48:05.690 effect, providing pain relief. Crucially, it's 00:48:05.690 --> 00:48:07.949 also proposed to work through mechanotransduction. 00:48:08.829 --> 00:48:10.789 Mechanotransduction, like the cell's sensing 00:48:10.789 --> 00:48:13.590 force. Exactly. Essentially waking up the tannocytes 00:48:13.590 --> 00:48:16.090 and stimulating a biological response that leads 00:48:16.090 --> 00:48:18.849 to tissue regeneration and remodeling. It's also 00:48:18.849 --> 00:48:21.130 thought to potentially help dissolve calcifications 00:48:21.130 --> 00:48:23.849 that can be present in some tendons. Is the evidence 00:48:23.849 --> 00:48:26.550 supporting ESWT's effectiveness consistent across 00:48:26.550 --> 00:48:29.010 all tendinopathies? Or is it better for some 00:48:29.010 --> 00:48:31.269 than others? The sources note variability in 00:48:31.269 --> 00:48:33.429 the evidence. For example, they state there is 00:48:33.429 --> 00:48:35.489 moderate evidence supporting its use for patellar 00:48:35.489 --> 00:48:39.110 tendinopathy. They also discuss reasons for the 00:48:39.110 --> 00:48:41.610 sometimes conflicting or controversial results 00:48:41.610 --> 00:48:44.170 seen in research studies. These include differences 00:48:44.170 --> 00:48:47.130 in methodology between studies, variations in 00:48:47.130 --> 00:48:49.269 how patients and their specific type or stage 00:48:49.269 --> 00:48:52.329 of tendinopathy are selected, and significant 00:48:52.329 --> 00:48:56.550 heterogeneity in the ESWT systems used. the treatment 00:48:56.550 --> 00:48:59.590 protocols, energy levels, number of pulses, frequency, 00:48:59.829 --> 00:49:02.650 and the study populations. So lots of variables 00:49:02.650 --> 00:49:05.650 making comparisons difficult. Precisely. It's 00:49:05.650 --> 00:49:07.929 sometimes positioned as a potential biosurgery 00:49:07.929 --> 00:49:10.530 tool due to its ability to stimulate biological 00:49:10.530 --> 00:49:13.090 responses. But the sources conclude that further 00:49:13.090 --> 00:49:16.070 research is needed, including exploring its potential 00:49:16.070 --> 00:49:18.769 role in treating tendinopathies linked to underlying 00:49:18.769 --> 00:49:21.559 metabolic disorders. Okay. Finally, there's a 00:49:21.559 --> 00:49:24.179 mention of a very specific, quite novel treatment 00:49:24.179 --> 00:49:26.559 approach called goldy treatment that sounds quite 00:49:26.559 --> 00:49:28.800 distinct. It is quite distinct based only on 00:49:28.800 --> 00:49:30.599 the description provided in the source material 00:49:30.599 --> 00:49:33.500 here. Goldy treatment involves incubating a sample 00:49:33.500 --> 00:49:36.340 of the patient's own venous blood with specially 00:49:36.340 --> 00:49:39.539 prepared gold particles for a period of 24 hours. 00:49:39.840 --> 00:49:43.280 Incubating blood with gold. Yes. The process 00:49:43.280 --> 00:49:45.440 then involves analyzing the resulting mixture 00:49:45.440 --> 00:49:48.599 using a specific spectroscopic method called 00:49:48.599 --> 00:49:52.300 aqua spec. This uses mid -infrared spectroscopy 00:49:52.300 --> 00:49:54.460 to measure the proteomic pattern, essentially, 00:49:54.800 --> 00:49:56.920 looking at the profile of proteins present. And 00:49:56.920 --> 00:49:59.340 the purpose of the gold. The stated goal of this 00:49:59.340 --> 00:50:01.539 incubation process with gold particles appears 00:50:01.539 --> 00:50:04.239 to be to increase the levels of specific anti 00:50:04.239 --> 00:50:06.360 -inflammatory mediators in the blood sample. 00:50:07.539 --> 00:50:09.559 The sources specifically mention increasing levels 00:50:09.559 --> 00:50:12.599 of interleukin -1 receptor antagonist, IL -1 00:50:12.599 --> 00:50:17.269 -RA, and soluble TNF alpha receptor 2. So, boosting 00:50:17.269 --> 00:50:19.289 anti -inflammatory signals in the blood sample. 00:50:19.309 --> 00:50:21.369 That seems to be the aim described. And what 00:50:21.369 --> 00:50:23.690 are the results cited for this approach? Any 00:50:23.690 --> 00:50:26.690 evidence? The source mentions an observed positive 00:50:26.690 --> 00:50:30.170 effect in horse studies. In human cases, it cites 00:50:30.170 --> 00:50:32.829 MRI documentation showing improvement in chronic 00:50:32.829 --> 00:50:34.949 Achilles tendinosis in an 80 -year -old patient. 00:50:35.489 --> 00:50:37.769 It also notes that this specific process did 00:50:37.769 --> 00:50:39.989 not appear to affect the expression or levels 00:50:39.989 --> 00:50:42.090 of certain other interleukins and chemokines 00:50:42.090 --> 00:50:44.750 that were tested. So, it's presented as a very 00:50:44.750 --> 00:50:48.900 specific gold -particle mediated approach aimed 00:50:48.900 --> 00:50:51.800 at modulating inflammatory mediators within the 00:50:51.800 --> 00:50:54.059 patient's blood before it's potentially used 00:50:54.059 --> 00:50:57.179 as a therapeutic injection. Still sounds quite 00:50:57.179 --> 00:50:59.420 experimental based on this description. Okay, 00:50:59.420 --> 00:51:01.699 we've covered an immense amount of ground, really, 00:51:01.760 --> 00:51:03.980 from the very structure of these tissues all 00:51:03.980 --> 00:51:06.599 the way to cutting -edge treatments. Let's briefly 00:51:06.599 --> 00:51:09.679 touch on some specific areas or conditions highlighted 00:51:09.679 --> 00:51:12.179 in the sources that might resonate most strongly 00:51:12.179 --> 00:51:14.619 with listeners, sort of connecting this back 00:51:14.619 --> 00:51:18.199 to common experiences of pain and injury. Certainly. 00:51:18.639 --> 00:51:21.099 In the lower limb, for instance, Hamstring injuries 00:51:21.099 --> 00:51:23.219 are very prevalent, particularly in sports involving 00:51:23.219 --> 00:51:25.440 sprinting or stretching. And as we discussed 00:51:25.440 --> 00:51:27.860 earlier, factors like muscle tendon dimensions 00:51:27.860 --> 00:51:29.780 can play a role in vulnerability, especially 00:51:29.780 --> 00:51:32.039 in sprinters. Right. Hamstrings are notorious. 00:51:32.400 --> 00:51:35.599 They are. Achilles tendonopathy is another extremely 00:51:35.599 --> 00:51:37.900 common issue, particularly in runners and jumping 00:51:37.900 --> 00:51:40.719 athletes. And the sources note that identifying 00:51:40.719 --> 00:51:43.239 the precise sources of pain in this condition 00:51:43.239 --> 00:51:46.420 can actually be complex, requiring very careful 00:51:46.420 --> 00:51:49.480 assessment. But teller tendonopathy? Jumper's 00:51:49.480 --> 00:51:52.579 knee. also frequent in jumping athletes. Effective 00:51:52.579 --> 00:51:54.539 load management is absolutely critical in its 00:51:54.539 --> 00:51:56.400 treatment, and it's recognized that there are 00:51:56.400 --> 00:51:58.340 different stages of the condition which influence 00:51:58.340 --> 00:52:01.260 management. What about issues further down in 00:52:01.260 --> 00:52:04.960 the foot and ankle area? Tibialis posterior insufficiency 00:52:04.960 --> 00:52:07.260 is discussed, often linked to the development 00:52:07.260 --> 00:52:10.320 of acquired flatfoot deformity. The sources emphasize 00:52:10.320 --> 00:52:12.820 the need for early diagnosis here to potentially 00:52:12.820 --> 00:52:15.599 prevent progressive issues. Peroneal tendons 00:52:15.599 --> 00:52:17.679 on the outside of the ankle are also mentioned. 00:52:18.260 --> 00:52:20.380 Injuries or subluxation slipping out of place 00:52:20.380 --> 00:52:22.340 are sometimes missed, particularly in sports 00:52:22.340 --> 00:52:24.980 involving cutting movements. Easy to miss. Apparently 00:52:24.980 --> 00:52:27.880 so. Plantar fascia issues are a very common cause 00:52:27.880 --> 00:52:30.699 of heel pain, and imaging like ultrasound is 00:52:30.699 --> 00:52:32.860 highlighted as useful for confirming the diagnosis 00:52:32.860 --> 00:52:35.659 by showing thickness or structural changes. and 00:52:35.659 --> 00:52:38.119 chronic exertional compartment syndrome, CECS. 00:52:38.400 --> 00:52:41.420 CECS, yes. Another lower limb issue detailed 00:52:41.420 --> 00:52:43.980 characterized by that exertional leg pain that 00:52:43.980 --> 00:52:46.519 typically resolves with rest but comes back with 00:52:46.519 --> 00:52:49.579 activity, often with a significant delay in diagnosis. 00:52:50.300 --> 00:52:52.400 Surgical fasciotomy is frequently the treatment 00:52:52.400 --> 00:52:55.219 of choice, although outcomes can vary. Moving 00:52:55.219 --> 00:52:57.400 up the body then, what about common issues in 00:52:57.400 --> 00:53:01.119 the upper limb, arm, shoulder? Lateral epicondylitis. 00:53:01.309 --> 00:53:04.250 Tennis elbow is a very common tendinopathy affecting 00:53:04.250 --> 00:53:07.590 the elbow extensor tendons, often linked to repetitive 00:53:07.590 --> 00:53:10.150 gripping or wrist movements. In the shoulder, 00:53:10.650 --> 00:53:13.590 long head of biceps, LHP pathology, is discussed 00:53:13.590 --> 00:53:15.630 as a common source of anterior shoulder pain. 00:53:15.789 --> 00:53:18.050 frequently linked to other underlying shoulder 00:53:18.050 --> 00:53:21.050 issues, like rotator cuff cares or labral problems. 00:53:21.510 --> 00:53:23.590 Specific physical tests are important for its 00:53:23.590 --> 00:53:26.250 diagnosis. LHB, okay. And hand and wrist? Yes, 00:53:26.369 --> 00:53:28.110 the hand and wrist are particularly prone to 00:53:28.110 --> 00:53:30.650 repetitive strain injuries, leading to various 00:53:30.650 --> 00:53:33.150 conditions involving tendons and their sheaths, 00:53:33.269 --> 00:53:35.369 like trigger finger or de Cravene's disease. 00:53:35.489 --> 00:53:38.489 And finally, the hip and groin area, often complex. 00:53:38.679 --> 00:53:41.699 Very complex. Tendinopathies around the hip can 00:53:41.699 --> 00:53:44.539 involve muscles like the iliopsoas, a hip flexor, 00:53:44.860 --> 00:53:46.639 and the rectus femoris, part of the quadriceps. 00:53:46.829 --> 00:53:49.469 Proximal hamstring issues, where the tendons 00:53:49.469 --> 00:53:52.150 attach high up near the sitting bone, are notable 00:53:52.150 --> 00:53:54.530 due to their close proximity to the sciatic nerve, 00:53:54.789 --> 00:53:57.570 which can lead to referred pain or nerve symptoms. 00:53:57.650 --> 00:54:00.710 Ah, sciatic nerve involvement. Yes. Groin pain 00:54:00.710 --> 00:54:03.530 itself is often complex, involving multiple structures, 00:54:03.929 --> 00:54:06.309 including adductor tendons, and the sources link 00:54:06.309 --> 00:54:09.869 it to underlying structural issues, like femuroestabular 00:54:09.869 --> 00:54:12.670 impingement, FAI, in the hip joint. It's clear 00:54:12.670 --> 00:54:14.730 these intricate tissues are involved in pain 00:54:14.730 --> 00:54:17.369 and dysfunction across the entire body in such 00:54:17.369 --> 00:54:20.389 a wide range of activities. As we begin to wrap 00:54:20.389 --> 00:54:22.730 up this deep dive, building on everything we've 00:54:22.730 --> 00:54:25.670 discussed, what are the key challenges that researchers 00:54:25.670 --> 00:54:27.949 and clinicians are still grappling with, and 00:54:27.949 --> 00:54:29.849 what does the future hold in this area? Well, 00:54:30.050 --> 00:54:31.889 the sources certainly highlight that despite 00:54:31.889 --> 00:54:34.650 significant progress, important knowledge gaps 00:54:34.650 --> 00:54:37.579 remain. For instance, determining the absolute 00:54:37.579 --> 00:54:40.480 optimal exercise protocols, you know, the perfect 00:54:40.480 --> 00:54:43.039 dosage of load, speed, frequency for different 00:54:43.039 --> 00:54:45.519 stages and types of tendinopathy is still being 00:54:45.519 --> 00:54:48.280 refined. Finding that perfect recipe. Exactly. 00:54:48.480 --> 00:54:50.920 Our full understanding of exactly what causes 00:54:50.920 --> 00:54:53.460 damage within that critical muscle -tendon junction 00:54:53.460 --> 00:54:56.300 in seemingly healthy tissue under certain loads 00:54:56.300 --> 00:54:59.889 isn't yet complete either. And as we discussed, 00:55:00.150 --> 00:55:02.590 the precise mechanisms of action for some newer 00:55:02.590 --> 00:55:05.730 treatments, like ESWT for example, need further 00:55:05.730 --> 00:55:08.289 detailed research. And there are areas where 00:55:08.289 --> 00:55:11.369 the evidence is still conflicting or maybe unclear? 00:55:11.530 --> 00:55:14.449 Yes, definitely. For certain specific rehabilitation 00:55:14.449 --> 00:55:17.849 modalities or the precise genetic links to injuries 00:55:17.849 --> 00:55:20.730 other than specific tendinopathies, the research 00:55:20.730 --> 00:55:22.869 results aren't always clear -cut or consistent 00:55:22.869 --> 00:55:25.250 across studies. There's a clear need for more 00:55:25.250 --> 00:55:27.530 robust research and greater standardization. 00:55:27.610 --> 00:55:30.250 Standardization in what sense? For example, in 00:55:30.250 --> 00:55:32.630 how PRP is prepared and applied clinically to 00:55:32.630 --> 00:55:35.269 ensure consistent results, or in the complex 00:55:35.269 --> 00:55:37.929 processes involved in tissue decellularization 00:55:37.929 --> 00:55:41.010 for grafts, as we touched upon. Right. So consistency 00:55:41.010 --> 00:55:43.670 and more high -quality evidence needed. What's 00:55:43.670 --> 00:55:46.210 the final takeaway regarding managing these conditions, 00:55:46.550 --> 00:55:48.710 especially for those listening who might be experiencing 00:55:48.710 --> 00:55:50.909 these issues themselves or perhaps working with 00:55:50.909 --> 00:55:53.309 people who are? I think the source is reinforced 00:55:53.309 --> 00:55:56.800 that while tenonopathy is often manageable, and 00:55:56.800 --> 00:55:59.480 symptoms can be significantly improved, it's 00:55:59.480 --> 00:56:02.039 not always curable in the sense of returning 00:56:02.039 --> 00:56:05.679 to a completely pain -free, pre -injury state, 00:56:06.239 --> 00:56:08.619 particularly for high -level athletes. Not always 00:56:08.619 --> 00:56:11.079 a complete cure then. Often it requires a long 00:56:11.079 --> 00:56:13.980 -term management perspective, focusing on building 00:56:13.980 --> 00:56:16.539 tissue capacity through carefully managed load 00:56:16.539 --> 00:56:19.199 and integrating strategies to allow successful 00:56:19.199 --> 00:56:22.519 return to sport or desired activity and then 00:56:22.519 --> 00:56:24.769 maintenance of function over time. It's often 00:56:24.769 --> 00:56:27.050 a journey of adaptation and management, not always 00:56:27.050 --> 00:56:29.869 a simple fix. A journey of adaptation and management. 00:56:29.949 --> 00:56:31.809 That's a really good way to frame it. This has 00:56:31.809 --> 00:56:33.969 been incredibly insightful, truly taking us from 00:56:33.969 --> 00:56:36.530 the nanoscopic structure of these tissues all 00:56:36.530 --> 00:56:38.789 the way to the clinical challenges and the cutting 00:56:38.789 --> 00:56:40.769 edge treatments. It's a fascinating area. It 00:56:40.769 --> 00:56:43.550 really is. To recap just a few key takeaways 00:56:43.550 --> 00:56:46.590 from this deep dive. We've seen that muscle and 00:56:46.590 --> 00:56:49.610 tendon tissues have remarkably complex hierarchical 00:56:49.610 --> 00:56:52.449 structures, precisely organized for transmitting 00:56:52.449 --> 00:56:55.639 load efficiently. They are dynamic, living tissues 00:56:55.639 --> 00:56:58.380 that constantly respond and remodel based on 00:56:58.380 --> 00:57:01.360 the mechanical loads we place on them via these 00:57:01.360 --> 00:57:03.780 intricate cell -driven processes. Absolutely 00:57:03.780 --> 00:57:06.800 key. Tendonopathy, particularly chronic forms, 00:57:07.119 --> 00:57:09.860 is often characterized by degeneration and a 00:57:09.860 --> 00:57:12.739 failed healing response rather than simple inflammation, 00:57:13.320 --> 00:57:15.460 a really crucial distinction. Yes, fundamental. 00:57:15.690 --> 00:57:18.329 Diagnosing these issues requires a multifaceted 00:57:18.329 --> 00:57:21.130 approach. Combining careful clinical examination 00:57:21.130 --> 00:57:23.170 with understanding the strength and limitations 00:57:23.170 --> 00:57:25.690 of various imaging techniques like ultrasound 00:57:25.690 --> 00:57:28.769 and MRI. Essential for accuracy. Load management 00:57:28.769 --> 00:57:31.150 and progressive exercise rather than complete 00:57:31.150 --> 00:57:34.010 rest are the absolute cornerstones of conservative 00:57:34.010 --> 00:57:36.969 rehabilitation aimed at building tissue capacity. 00:57:37.230 --> 00:57:39.269 The foundation of recovery. And finally, the 00:57:39.269 --> 00:57:42.030 landscape of biological treatments like PRP and 00:57:42.030 --> 00:57:45.110 shockwave therapy is evolving, offering new avenues 00:57:45.039 --> 00:57:47.719 to potentially optimize healing, although more 00:57:47.719 --> 00:57:50.039 robust research is still needed to refine their 00:57:50.039 --> 00:57:53.139 use. Indeed. Understanding that intricate biological 00:57:53.139 --> 00:57:55.400 and mechanical dance within these tissues is 00:57:55.400 --> 00:57:58.300 truly key to both preventing injuries where possible 00:57:58.300 --> 00:58:00.400 and effectively treating them when they occur. 00:58:00.570 --> 00:58:02.989 It really leaves you with the thought that perhaps 00:58:02.989 --> 00:58:06.230 the future of managing these incredibly common, 00:58:06.750 --> 00:58:09.710 often debilitating, conditions lies in better 00:58:09.710 --> 00:58:12.690 understanding and ultimately harnessing the body's 00:58:12.690 --> 00:58:15.889 own remarkable healing mechanisms, guided by 00:58:15.889 --> 00:58:18.610 that fundamental principle of applying just the 00:58:18.610 --> 00:58:21.750 right, precise load at the right time. A hopeful 00:58:21.750 --> 00:58:24.090 thought for the future. If you found the insights 00:58:24.090 --> 00:58:26.780 in this deep dive valuable, Please do take a 00:58:26.780 --> 00:58:28.639 moment to rate and share it on your professional 00:58:28.639 --> 00:58:31.280 networks like LinkedIn or X. Sharing knowledge 00:58:31.280 --> 00:58:34.059 helps advance understanding for everyone. Absolutely. 00:58:34.940 --> 00:58:37.199 That's all for this deep dive. Thank you so much 00:58:37.199 --> 00:58:39.219 for joining us and sharing your expertise. It's 00:58:39.219 --> 00:58:41.039 been a real pleasure. Thank you. Until next time.