WEBVTT 00:00:00.000 --> 00:00:02.700 Welcome to the Deep Dive, where we take complex 00:00:02.700 --> 00:00:05.400 medical topics and really break them down into 00:00:05.400 --> 00:00:08.199 actionable insights specifically for you. Today, 00:00:08.279 --> 00:00:10.439 we're plunging into a condition that's absolutely 00:00:10.439 --> 00:00:13.179 critical for anyone working with overhead athletes, 00:00:13.919 --> 00:00:17.300 glenohumeral internal rotation deficit, or GIRD. 00:00:17.550 --> 00:00:20.149 It's a fascinating area, isn't it? Where the 00:00:20.149 --> 00:00:22.390 body's natural adaptations for peak performance 00:00:22.390 --> 00:00:25.870 can sometimes, well, tip over into pathology, 00:00:26.170 --> 00:00:28.750 creates a real challenge. Joining us to navigate 00:00:28.750 --> 00:00:30.989 this intricate topic and to help us unpack its 00:00:30.989 --> 00:00:33.270 nuances, its impacts, and the best strategies 00:00:33.270 --> 00:00:36.229 for diagnosis and treatment is Prophemo Imam. 00:00:36.689 --> 00:00:38.549 This is a topic that affects so many athletes, 00:00:38.810 --> 00:00:40.509 you know, professional pitchers, tennis players, 00:00:40.729 --> 00:00:43.090 even, well, weekend warriors. Understanding it 00:00:43.090 --> 00:00:45.109 can really change how we approach shoulder health. 00:00:45.280 --> 00:00:46.799 Absolutely. It's a pleasure to be here. It's 00:00:46.799 --> 00:00:49.020 a fundamental issue in sports medicine. So let's 00:00:49.020 --> 00:00:51.399 start right at the beginning. For our medical 00:00:51.399 --> 00:00:54.380 audience listening, how would you define glenohumeral 00:00:54.380 --> 00:00:56.979 internal rotation deficit? And why is it just 00:00:56.979 --> 00:00:59.600 so common, particularly in these overhead athletes? 00:01:00.119 --> 00:01:03.740 OK. Well, at its core, GIRD is fundamentally 00:01:03.740 --> 00:01:06.540 characterized by a significant reduction in internal 00:01:06.540 --> 00:01:09.439 rotation IR, we often call it, of the glenohumeral 00:01:09.439 --> 00:01:11.879 joint. That's the main ball and socket joint 00:01:11.879 --> 00:01:14.400 of the shoulder, of course. And we see this reduction 00:01:14.400 --> 00:01:16.719 in the dominant, the throwing shoulder, when 00:01:16.719 --> 00:01:18.620 we compare it directly to the non -dominant, 00:01:18.760 --> 00:01:21.760 the contralateral shoulder. Now, what's absolutely 00:01:21.760 --> 00:01:23.700 crucial to grasp here is that this loss of internal 00:01:23.700 --> 00:01:26.980 rotation isn't usually an isolated thing. It's 00:01:26.980 --> 00:01:31.500 very often accompanied by a compensatory increase 00:01:31.500 --> 00:01:34.219 in external rotation or ER. Think of it like 00:01:34.219 --> 00:01:36.400 a rebalancing act by the shoulder. The whole 00:01:36.400 --> 00:01:38.840 arc of motion sort of shifts posteriorly. So 00:01:38.840 --> 00:01:41.239 it adapts, essentially. Precisely, it adapts. 00:01:41.519 --> 00:01:43.280 Now the most commonly accepted clinical definition, 00:01:43.400 --> 00:01:45.700 the one we tend to use day to day, is a difference 00:01:45.700 --> 00:01:48.099 of 20 degrees or more in internal rotation between 00:01:48.099 --> 00:01:50.200 the throwing and non -throwing shoulders. So 00:01:50.200 --> 00:01:51.700 if you measure an athlete and their dominant 00:01:51.700 --> 00:01:53.939 arm internally rotates 20 degrees less than their 00:01:53.939 --> 00:01:56.560 non -dominant arm, that definitely flags up as 00:01:56.560 --> 00:01:59.049 GID. However, and this is where it gets really 00:01:59.049 --> 00:02:00.609 interesting, and frankly where the important 00:02:00.609 --> 00:02:04.129 clinical distinction lies, not all GIRD is inherently 00:02:04.129 --> 00:02:06.170 pathological. Right, that's a key point you raised 00:02:06.170 --> 00:02:08.949 earlier. So how do we actually tell the difference 00:02:08.949 --> 00:02:11.750 between just an adaptation and a real problem? 00:02:11.870 --> 00:02:13.729 That's the million dollar question, isn't it? 00:02:13.949 --> 00:02:16.990 We differentiate between what we call an anatomical 00:02:16.990 --> 00:02:21.889 GRD, AGRD, and a pathological GRD, or PGRD. An 00:02:21.889 --> 00:02:24.409 anatomical GRD represents a normal physiological 00:02:24.409 --> 00:02:27.500 adaptation. the body's response to the, frankly, 00:02:27.939 --> 00:02:31.960 extreme demands of throwing. In AGRD, the increase 00:02:31.960 --> 00:02:34.639 in external rotation fully compensates for the 00:02:34.639 --> 00:02:37.159 loss of internal rotation, so it maintains a 00:02:37.159 --> 00:02:40.259 symmetrical coel rotational motion, or TRM. TRM, 00:02:40.400 --> 00:02:42.300 that's just the sum of internal and external 00:02:42.300 --> 00:02:44.860 rotation. Exactly. Measured at 90 degrees of 00:02:44.860 --> 00:02:47.199 abduction. So in essence, the shoulder's overall 00:02:47.199 --> 00:02:49.060 available arc of motion remains balanced. It's 00:02:49.060 --> 00:02:51.319 just shifted. The athlete gets that extra external 00:02:51.319 --> 00:02:53.759 rotation, great for throwing velocity. And while 00:02:53.759 --> 00:02:55.819 internal rotation is down, the total mobility 00:02:55.819 --> 00:02:58.240 is preserved. Often, this is actually protective. 00:02:58.599 --> 00:03:01.000 OK, so AGRD is potentially a good thing, or at 00:03:01.000 --> 00:03:03.800 least a neutral adaptation. What about PGRD, 00:03:03.840 --> 00:03:08.259 then? Pathological GRD, PGRD, is marked by a 00:03:08.259 --> 00:03:11.300 true loss of total rotational motion. Typically, 00:03:11.460 --> 00:03:13.300 we define this as a difference of more than 5 00:03:13.300 --> 00:03:15.580 degrees of TRM when compared to the contralateral 00:03:15.580 --> 00:03:18.680 shoulder. So if the sum of IR and ER in the dominant 00:03:18.680 --> 00:03:21.060 arm is more than 5 degrees less than the non 00:03:21.060 --> 00:03:24.740 -dominant arm, that's PGIRD. And this is precisely 00:03:24.740 --> 00:03:26.939 where we start to see that significantly increased 00:03:26.939 --> 00:03:30.240 risk of injury. And crucially, a measurable decrease 00:03:30.240 --> 00:03:32.610 in shoulder strength and function. It's this 00:03:32.610 --> 00:03:35.349 net loss of total motion you see, not just the 00:03:35.349 --> 00:03:37.490 IR deficit alone, that really points towards 00:03:37.490 --> 00:03:40.169 a problem. It signals that the adaptation has 00:03:40.169 --> 00:03:42.930 gone too far, tipped into maladaptation. That 00:03:42.930 --> 00:03:44.949 makes sense. It's the overall range that's compromised. 00:03:45.169 --> 00:03:48.430 Exactly. Now, in terms of prevalence, GIRD is 00:03:48.430 --> 00:03:50.889 exceptionally common among overhead athletes, 00:03:51.490 --> 00:03:53.389 which really underscores its importance in sports 00:03:53.389 --> 00:03:55.650 medicine. Studies indicate it affects roughly 00:03:55.650 --> 00:03:58.150 25 % of baseball players, both professional and 00:03:58.150 --> 00:04:00.560 amateur, as one in four. Significant. One in 00:04:00.560 --> 00:04:03.259 four. That's huge. It is. And it's not just baseball. 00:04:04.020 --> 00:04:06.539 Even more striking in sports like handball and 00:04:06.539 --> 00:04:08.879 volleyball. Some research has shown prevalence 00:04:08.879 --> 00:04:11.960 rates hitting as high as 72 percent. So the incident 00:04:11.960 --> 00:04:14.719 seems to correlate directly with the duration 00:04:14.719 --> 00:04:17.379 and intensity of an athlete's training. The more 00:04:17.379 --> 00:04:19.279 throwing, the more serving, especially from a 00:04:19.279 --> 00:04:21.600 young age, the higher the likelihood of developing 00:04:21.600 --> 00:04:24.819 some form of GRD. It's not an anomaly. It's a 00:04:24.819 --> 00:04:27.720 very common adaptation or sometimes maladaptation 00:04:27.720 --> 00:04:30.199 to these unique sporting demands. That distinction 00:04:30.199 --> 00:04:33.360 between anatomical and pathological GRD based 00:04:33.360 --> 00:04:36.439 on the total rotational motion, that seems absolutely 00:04:36.439 --> 00:04:38.720 critical for clinicians listening. So the key 00:04:38.720 --> 00:04:41.279 takeaway isn't just if our athlete has GRD, but 00:04:41.279 --> 00:04:44.339 whether their TRM is maintained correct. It stops 00:04:44.339 --> 00:04:46.899 us over treating a potentially beneficial adaptation. 00:04:47.180 --> 00:04:49.939 Precisely. That TRM measurement acts as the real 00:04:49.939 --> 00:04:52.560 diagnostic filter. It guides our clinical decision 00:04:52.560 --> 00:04:55.360 -making enormously, avoids unnecessary intervention. 00:04:55.939 --> 00:04:59.480 OK. It's clear GIRD is a major concern, especially 00:04:59.480 --> 00:05:02.220 when it hits that pathological threshold. So 00:05:02.220 --> 00:05:04.019 could you dive a bit deeper into the underlying 00:05:04.019 --> 00:05:06.860 biomechanics and pathophysiology? What's actually 00:05:06.860 --> 00:05:09.220 happening inside the shoulder during these repetitive 00:05:09.220 --> 00:05:11.300 high -velocity movements? Right. Let's unpack 00:05:11.300 --> 00:05:14.620 the mechanism. The development of GIRD is quite 00:05:14.620 --> 00:05:17.860 a complex interplay. Repetitive stress, often 00:05:17.860 --> 00:05:20.259 way beyond normal physiological loads leading 00:05:20.259 --> 00:05:22.620 to tissue adaptation, sometimes good, sometimes 00:05:22.620 --> 00:05:25.279 bad. During that high velocity overhead throwing 00:05:25.279 --> 00:05:27.459 motion, particularly in the late cocking phase, 00:05:28.040 --> 00:05:30.759 arm way back, maximum external rotation, and 00:05:30.759 --> 00:05:33.399 then into early acceleration. Well, the shoulder 00:05:33.399 --> 00:05:35.699 joint experiences immense forces. We're talking 00:05:35.699 --> 00:05:38.420 torques over 60 Newton meters, internal rotation 00:05:38.420 --> 00:05:40.720 accelerations exceeding 6 ,000 degrees per second. 00:05:40.939 --> 00:05:42.899 These forces push the joint structures right 00:05:42.899 --> 00:05:45.079 to their limits repeatedly. Thousands of times 00:05:45.079 --> 00:05:48.060 over a career. Exactly. And the primary pathological 00:05:48.060 --> 00:05:51.079 process, often the first domino, involves changes 00:05:51.079 --> 00:05:53.120 in the posterior capsule of the glenohumeral 00:05:53.120 --> 00:05:56.449 joint. Repetitive motions, especially that extreme 00:05:56.449 --> 00:05:59.250 external rotation, leads to a gradual tightening, 00:05:59.430 --> 00:06:02.170 a thickening, of this posterior capsule, specifically 00:06:02.170 --> 00:06:05.629 the post row inferior part. This capsular tightness, 00:06:05.930 --> 00:06:07.949 the capsular constraint mechanism we mentioned, 00:06:08.470 --> 00:06:10.850 essentially pulls the humeral head, the ball, 00:06:11.269 --> 00:06:13.790 in the opposite direction. So post row inferior 00:06:13.790 --> 00:06:16.089 tightness, very common in throwers, tends to 00:06:16.089 --> 00:06:18.129 cause a post row superior translation of the 00:06:18.129 --> 00:06:20.269 humeral head during abduction and external rotation. 00:06:20.540 --> 00:06:23.240 The ball shifts slightly up and back in the socket 00:06:23.240 --> 00:06:25.480 during throwing. Almost like it's being levered 00:06:25.480 --> 00:06:29.040 out of position slightly. In a way, yes. And 00:06:29.040 --> 00:06:31.240 concurrently, whilst the back tightens, the anterior 00:06:31.240 --> 00:06:34.139 capsule often gets stretched, maybe even develops 00:06:34.139 --> 00:06:37.160 microtrauma, contributing to the overall imbalance 00:06:37.160 --> 00:06:39.540 and potential instability down the line. So it's 00:06:39.540 --> 00:06:41.220 not just tightness, it's an imbalanced front 00:06:41.220 --> 00:06:44.360 to back. Precisely. But it's not just the capsule 00:06:44.360 --> 00:06:47.519 either. Recent data strongly suggests that posterior 00:06:47.519 --> 00:06:50.120 rotator cuff tightness also plays a significant 00:06:50.120 --> 00:06:53.680 role in GIRD. We've seen internal rotation deficits 00:06:53.680 --> 00:06:57.279 of up to 15 % develop after just a single intense 00:06:57.279 --> 00:07:00.639 throwing session. 15 % after one session. Yes. 00:07:00.959 --> 00:07:03.399 Which is far too rapid for capsular contracture 00:07:03.399 --> 00:07:06.100 alone to explain. That points towards a dynamic 00:07:06.100 --> 00:07:08.779 muscular component. The posterior cuff muscles 00:07:08.779 --> 00:07:11.600 infraspinatus, teres minor, they can develop 00:07:11.600 --> 00:07:13.779 adaptive shortening and stiffness from the constant 00:07:13.779 --> 00:07:16.220 eccentric loading, decelerating the arm after 00:07:16.220 --> 00:07:19.199 release. This muscular tightness directly restricts 00:07:19.199 --> 00:07:22.290 internal rotation, adding to the So soft tissues, 00:07:22.490 --> 00:07:24.930 both capsule and muscle. What about bone? Ah, 00:07:24.930 --> 00:07:27.730 yes. The bony adaptations are fascinating, especially 00:07:27.730 --> 00:07:29.910 in athletes who start young during skeletal development. 00:07:30.410 --> 00:07:32.689 These overhead athletes often show increased 00:07:32.689 --> 00:07:35.629 humeral retrotortion in their dominant arm. Retrotortion. 00:07:35.810 --> 00:07:38.329 So the bone itself is twisted differently. Essentially, 00:07:38.610 --> 00:07:41.129 yes. The top of the humerus, where it meets the 00:07:41.129 --> 00:07:44.029 socket, is rotated slightly backward relative 00:07:44.029 --> 00:07:46.430 to the elbow, compared to the non -throwing arm. 00:07:46.639 --> 00:07:49.860 This bony change shifts the whole arc of motion 00:07:49.860 --> 00:07:52.860 posteriorly. It allows more external rotation, 00:07:53.060 --> 00:07:55.879 good for throwing, but inherently limits internal 00:07:55.879 --> 00:07:59.839 rotation. It contributes directly to GRRD. Similarly, 00:08:00.279 --> 00:08:02.660 we sometimes see increased glenoid retroversion. 00:08:02.959 --> 00:08:05.079 The socket itself is angled slightly more backward. 00:08:05.279 --> 00:08:07.779 And these bony changes are permanent? Generally, 00:08:07.959 --> 00:08:10.420 yes, if they develop during growth. Interestingly, 00:08:10.680 --> 00:08:12.800 many experts believe these bony adaptations are 00:08:12.800 --> 00:08:14.959 actually protective. They allow that greater 00:08:14.959 --> 00:08:18.100 ER needed for velocity, whilst potentially reducing 00:08:18.100 --> 00:08:20.540 stress on the anterior soft tissues, like the 00:08:20.540 --> 00:08:22.519 legroom and capsule, which might otherwise fail. 00:08:22.699 --> 00:08:25.160 Which leads nicely into the thrower's paradox, 00:08:25.240 --> 00:08:28.899 doesn't it? Exactly. The thrower's paradox perfectly 00:08:28.899 --> 00:08:31.639 highlights this tension, mobility versus stability. 00:08:32.100 --> 00:08:34.620 To perform at an elite level, throwers develop 00:08:34.620 --> 00:08:37.179 superphysiological range of motion. external 00:08:37.179 --> 00:08:40.539 rotation over 160 degrees, incredible acceleration 00:08:40.539 --> 00:08:43.779 and torque. But these kinematic extremes place 00:08:43.779 --> 00:08:46.379 enormous repetitive stress on both these static 00:08:46.379 --> 00:08:49.360 stabilizers capsule, ligaments, and the dynamic 00:08:49.360 --> 00:08:52.639 stabilizers rotator cuff labrum. This constant 00:08:52.639 --> 00:08:55.159 micro loading predisposes them to micro instability, 00:08:55.759 --> 00:08:57.879 subtle joint laxity, and eventually a cascade 00:08:57.879 --> 00:09:00.440 of injuries. The very adaptations for performance 00:09:00.440 --> 00:09:03.259 increase the risk. That's the paradox. It's an 00:09:03.259 --> 00:09:05.279 incredible balancing act the body performs or 00:09:05.279 --> 00:09:07.379 tries to. That's a very clear picture of the 00:09:07.379 --> 00:09:10.179 why behind GRD capsule, muscle, bone, all adapting 00:09:10.179 --> 00:09:12.860 to extreme forces. So let's bring this back to 00:09:12.860 --> 00:09:14.919 the clinic. An athlete comes in maybe with that 00:09:14.919 --> 00:09:16.799 dead arm feeling or that posterior ache. What 00:09:16.799 --> 00:09:19.039 symptoms should really make us suspect GRD and 00:09:19.039 --> 00:09:21.200 how do we go about diagnosing it properly, both 00:09:21.200 --> 00:09:23.299 clinically and perhaps with imaging? Right, the 00:09:23.299 --> 00:09:26.039 clinical presentation. Well, patients with pathological 00:09:26.039 --> 00:09:29.200 GRD often present with a range of symptoms, though 00:09:29.200 --> 00:09:32.159 importantly, it can be painless initially. especially 00:09:32.159 --> 00:09:35.139 anatomical GRED or just manifest as a drop in 00:09:35.139 --> 00:09:38.179 performance. When symptoms do appear, the classic 00:09:38.179 --> 00:09:41.480 one is vague shoulder pain, often deep in the 00:09:41.480 --> 00:09:44.080 posterior shoulder, and it's typically aggravated 00:09:44.080 --> 00:09:46.639 in that late cocking position of throwing. Right 00:09:46.639 --> 00:09:49.460 at the point of maximum stretch? Precisely. They 00:09:49.460 --> 00:09:51.539 might also report shoulder stiffness, maybe needing 00:09:51.539 --> 00:09:53.799 a much longer warm -up than usual to feel loose. 00:09:54.220 --> 00:09:56.779 And a key one that often brings them in is a 00:09:56.779 --> 00:09:59.600 noticeable drop in performance velocity, control 00:09:59.600 --> 00:10:01.940 sometimes described as that dead -arm sensation. 00:10:02.379 --> 00:10:05.539 That indicates a real functional issue. On examination, 00:10:05.799 --> 00:10:07.659 beyond the range of motion changes, you might 00:10:07.659 --> 00:10:10.100 find specific tenderness to touch, perhaps over 00:10:10.100 --> 00:10:12.519 the posterior capsule or infraspinatus tendon, 00:10:12.700 --> 00:10:14.940 maybe some subtle weakness or even swelling. 00:10:15.159 --> 00:10:17.840 And the physical examination itself, measuring 00:10:17.840 --> 00:10:21.210 the rotation. The physical exam, especially range 00:10:21.210 --> 00:10:23.769 of motion assessment, is absolutely paramount, 00:10:24.190 --> 00:10:26.730 and technique is critical. We must stabilize 00:10:26.730 --> 00:10:29.389 the scapula meticulously. Otherwise, you're measuring 00:10:29.389 --> 00:10:32.470 scapula thoracic motion, which masks the true 00:10:32.470 --> 00:10:35.149 glenohumeral deficit. The preferred method is 00:10:35.149 --> 00:10:38.340 supine. Patient on their back. Shoulder abducted 00:10:38.340 --> 00:10:41.360 to 90 degrees, elbow flexed to 90. Then passively 00:10:41.360 --> 00:10:43.559 assess maximum external and internal rotation 00:10:43.559 --> 00:10:46.419 with a goniometer. Compare dominant to non -dominant. 00:10:46.500 --> 00:10:48.480 And the key for internal rotation is stopping 00:10:48.480 --> 00:10:50.960 before the scapula lifts. Absolutely crucial. 00:10:51.179 --> 00:10:53.460 You measure IR only up to the point just before 00:10:53.460 --> 00:10:55.279 the scapula starts to lift off the examination 00:10:55.279 --> 00:10:57.740 table. That's your true glenohumeral end range. 00:10:58.259 --> 00:11:00.799 As we said, a 20 degree or more difference in 00:11:00.799 --> 00:11:04.230 IR is the common threshold for GRRD. and vitally 00:11:04.230 --> 00:11:06.190 calculate the total rotational motion of the 00:11:06.190 --> 00:11:08.789 TRM for both sides. A loss of more than five 00:11:08.789 --> 00:11:10.970 degrees of TRM in the dominant arm points towards 00:11:10.970 --> 00:11:13.350 pathological GRD. Okay, so range of motion is 00:11:13.350 --> 00:11:15.629 central. Are there other specific tests you use? 00:11:15.950 --> 00:11:18.889 Yes, definitely. Beyond basic ROMs, specific 00:11:18.889 --> 00:11:21.200 tests help paint the full picture. The sulcus 00:11:21.200 --> 00:11:23.480 sign, for instance. You gently pull down on the 00:11:23.480 --> 00:11:26.179 arm. If a little dimple or sulcus appears below 00:11:26.179 --> 00:11:29.059 the acromion, it suggests laxity in the rotator 00:11:29.059 --> 00:11:31.600 interval structures. We see that in about two 00:11:31.600 --> 00:11:34.899 -thirds of pitchers with GRD, often due to repetitive 00:11:34.899 --> 00:11:36.940 stretching in the cocking phase. Testing for 00:11:36.940 --> 00:11:39.600 that posterior tightness, specifically. For posterior 00:11:39.600 --> 00:11:42.159 tightness, the Tyler -Edel method is very useful. 00:11:42.379 --> 00:11:44.000 Patient lies on their side, throwing shoulder 00:11:44.000 --> 00:11:46.950 up. Shoulder at 90 abduction. neutral rotation, 00:11:47.230 --> 00:11:49.950 scapula stabilized. Then you maximally adduct 00:11:49.950 --> 00:11:52.389 the arm across the body towards the floor, measure 00:11:52.389 --> 00:11:54.590 the distance, the medial epicondyle travels downwards. 00:11:55.070 --> 00:11:57.210 A one centimeter loss in this cross body adduction 00:11:57.210 --> 00:11:59.509 compared to the other side correlates roughly 00:11:59.509 --> 00:12:02.009 to a five degree loss of internal rotation. So 00:12:02.009 --> 00:12:04.309 a four centimeter deficit suggests about 20 degrees 00:12:04.309 --> 00:12:07.250 of GRD. It's a neat clinical measurement. Very 00:12:07.250 --> 00:12:09.490 practical. And testing for that internal impingement 00:12:09.490 --> 00:12:11.549 you mentioned. For internal impingement, we use 00:12:11.549 --> 00:12:13.970 the posterior impingement sign described by Meister. 00:12:14.120 --> 00:12:16.519 You passively take the shoulder into maximum 00:12:16.519 --> 00:12:19.159 abduction and external rotation, mimicking late 00:12:19.159 --> 00:12:22.639 cocking. If this reproduces deep posterior shoulder 00:12:22.639 --> 00:12:26.360 pain, it's positive. It strongly suggests impingement, 00:12:26.740 --> 00:12:28.919 often associated post or superior labral tears 00:12:28.919 --> 00:12:31.960 or those pasta lesions, partial rotator cuff 00:12:31.960 --> 00:12:35.460 tears. We also look very carefully for S .E. 00:12:35.620 --> 00:12:38.440 scapula. that acronym, scapular malposition, 00:12:38.919 --> 00:12:41.399 inferior medial border prominence, coracoid pain 00:12:41.399 --> 00:12:44.019 malposition, and dyskinesis of scapular movement. 00:12:44.220 --> 00:12:46.159 Assessing how the shoulder blade moves. Exactly. 00:12:46.360 --> 00:12:48.559 Both its resting position and how it moves dynamically 00:12:48.559 --> 00:12:51.360 during arm elevation. Abnormal scapular mechanics 00:12:51.360 --> 00:12:54.100 are incredibly common and contribute hugely to 00:12:54.100 --> 00:12:56.419 shoulder dysfunction. And finally, you absolutely 00:12:56.419 --> 00:12:58.980 have to assess the entire kinetic chain. Core 00:12:58.980 --> 00:13:02.149 stability, hip rotation, leg strength. Deficits 00:13:02.149 --> 00:13:04.009 anywhere down the chain can overload the shoulder. 00:13:04.309 --> 00:13:06.090 It's never just the shoulder in isolation, is 00:13:06.090 --> 00:13:08.029 it? Never. Especially not in throwing athletes. 00:13:08.269 --> 00:13:10.250 What about imaging? You mentioned radiographs 00:13:10.250 --> 00:13:12.909 aren't usually helpful. Generally, plane radiographs 00:13:12.909 --> 00:13:16.049 are non -diagnostic for GRD itself. You might 00:13:16.049 --> 00:13:18.230 occasionally see a Bennett's lesion in chronic 00:13:18.230 --> 00:13:21.029 cases that post your glenoid bone spur, or perhaps 00:13:21.029 --> 00:13:23.350 increased glenoid retroversion on a CT scan. 00:13:23.500 --> 00:13:26.720 But MRI is really the modality of choice. It's 00:13:26.720 --> 00:13:29.799 essential for identifying those associated soft 00:13:29.799 --> 00:13:33.059 tissue injuries, labral tears, rotator cuff tears, 00:13:33.460 --> 00:13:35.620 and ruling out other potential causes of shoulder 00:13:35.620 --> 00:13:38.620 pain. And the ABE view abduction and external 00:13:38.620 --> 00:13:41.840 rotation position during the MRI scan is particularly 00:13:41.840 --> 00:13:44.500 helpful. It tensions the structures, like the 00:13:44.500 --> 00:13:47.340 biceps anchor, making subtle tears, especially 00:13:47.340 --> 00:13:50.240 SLAP lesions or undersurface cuff tears, much 00:13:50.240 --> 00:13:53.350 easier to visualize. So a combination of thorough 00:13:53.350 --> 00:13:56.029 clinical exam and targeted MRI seems the gold 00:13:56.029 --> 00:13:58.230 standard. That comprehensive approach is key 00:13:58.230 --> 00:14:00.610 for an accurate diagnosis and planning effective 00:14:00.610 --> 00:14:03.250 management. It's fascinating how GRD starts as 00:14:03.250 --> 00:14:05.129 an adaptation, but you've clearly outlined how 00:14:05.129 --> 00:14:07.350 it can really open the door to a whole cascade 00:14:07.350 --> 00:14:09.129 of other problems. Could you elaborate a bit 00:14:09.129 --> 00:14:11.350 more on those specific pathologies commonly linked 00:14:11.350 --> 00:14:14.090 with GIRD, and how does it all impact the athlete's 00:14:14.090 --> 00:14:16.090 function and even their quality of life? It sounds 00:14:16.090 --> 00:14:17.830 like it goes well beyond just shoulder pain. 00:14:18.190 --> 00:14:20.230 You're absolutely right. Well, as GRD can be 00:14:20.230 --> 00:14:23.750 adaptive. Pathological GRD significantly predisposes 00:14:23.750 --> 00:14:26.830 athletes to various interconnected issues. We 00:14:26.830 --> 00:14:28.929 can group them into intraarticular injuries, 00:14:29.250 --> 00:14:31.750 extraarticular problems, and kinetic chain issues. 00:14:32.269 --> 00:14:34.789 Within the joint itself first, then. Intraarticularly, 00:14:34.970 --> 00:14:37.570 postural superior labral tears are really considered 00:14:37.570 --> 00:14:39.730 the hallmark lesion of internal impingement. 00:14:40.090 --> 00:14:42.690 It happens from that repetitive impact, the greater 00:14:42.690 --> 00:14:45.509 tuberosity hitting the back top part of the glenoid 00:14:45.509 --> 00:14:48.710 rim and labrum during lay cocking, causes fraying, 00:14:48.889 --> 00:14:51.879 tearing. We also frequently see Partial articular 00:14:51.879 --> 00:14:55.100 -sided rotator cuff tears, pasta lesions, often 00:14:55.100 --> 00:14:58.159 the supraspinatus or anterior infaspinatus, again 00:14:58.159 --> 00:15:00.559 from that repetitive microtrauma, sheer stress 00:15:00.559 --> 00:15:02.460 from the impingement, sometimes compounded by 00:15:02.460 --> 00:15:04.779 issues with the superior capsule. And SLAP tears, 00:15:05.200 --> 00:15:08.679 superior labrum anterior to posterior. Yes. SLP 00:15:08.679 --> 00:15:11.299 tears are common, too. The mechanism is debated, 00:15:11.600 --> 00:15:14.840 but the peel -back idea is prominent. In extreme 00:15:14.840 --> 00:15:17.820 AB ear, the biceps anchor in the posterior superior 00:15:17.820 --> 00:15:20.000 labrum can be torqued or peeled away from the 00:15:20.000 --> 00:15:22.440 glenoid. Combine that with superior migration 00:15:22.440 --> 00:15:25.220 of the humeral head due to cuff fatigue or imbalance, 00:15:25.940 --> 00:15:28.179 plus the massive tensile stress from the biceps 00:15:28.179 --> 00:15:30.899 contracting during deceleration. It all contributes 00:15:30.899 --> 00:15:34.480 to SLAP pathology. Micro instability is another 00:15:34.480 --> 00:15:37.080 one, subtle laxity from stretching of the rotator 00:15:37.080 --> 00:15:39.480 interval structures, those key ligams of the 00:15:39.480 --> 00:15:41.639 front, again from repetitive throwing forces. 00:15:42.019 --> 00:15:44.279 Okay, so problems inside the joint. What about 00:15:44.279 --> 00:15:47.179 outside or around it? Well, moving just outside, 00:15:47.379 --> 00:15:49.860 GIRD has significant implications for the kinetic 00:15:49.860 --> 00:15:52.759 chain. We mentioned SECK scapula, that abnormal 00:15:52.759 --> 00:15:55.039 scatter positioning and movement. This directly 00:15:55.039 --> 00:15:57.500 leads to altered kinematics, abnormal movement 00:15:57.500 --> 00:15:59.399 patterns, not just at the glenohumeral joint, 00:15:59.480 --> 00:16:02.679 but also the acromioclavicular or AC joint. Clinically, 00:16:02.700 --> 00:16:04.580 this can manifest as anterior shoulder pain, 00:16:04.980 --> 00:16:07.240 maybe AC joint tenderness, reduced forward flexion. 00:16:07.740 --> 00:16:09.679 The scapula's role in energy transfer during 00:16:09.679 --> 00:16:12.039 throwing is huge, so dyskinesis makes the whole 00:16:12.039 --> 00:16:14.679 chain inefficient and injury prone. And the link 00:16:14.679 --> 00:16:17.759 to elbow problems, that seems particularly worrying. 00:16:18.179 --> 00:16:20.649 Yes. Perhaps one of the most concerning associations 00:16:20.649 --> 00:16:23.950 is the strong link between GIRD and ulnar collateral 00:16:23.950 --> 00:16:26.929 ligament UCL tears at the elbow, Tommy John injuries. 00:16:27.769 --> 00:16:29.929 The increased external rotation range that often 00:16:29.929 --> 00:16:33.690 comes with GIRD, while good for velocity, simultaneously 00:16:33.690 --> 00:16:36.230 increases the valgus flow of the outward stress 00:16:36.230 --> 00:16:38.730 on the inside of the elbow, directly stressing 00:16:38.730 --> 00:16:42.059 the UCL. However, there's a crucial nuance here. 00:16:42.440 --> 00:16:44.480 Some studies suggest it's actually the decreased 00:16:44.480 --> 00:16:47.639 total rotational motion pathological GRRD rather 00:16:47.639 --> 00:16:50.100 than just the isolated internal rotation deficit 00:16:50.100 --> 00:16:52.940 that more strongly predisposes pitchers to UCO 00:16:52.940 --> 00:16:54.860 injuries. So again, it comes back to that loss 00:16:54.860 --> 00:16:57.440 of overall motion, the PGRRD. It seems to be 00:16:57.440 --> 00:16:59.600 a critical factor, yes, highlighting the need 00:16:59.600 --> 00:17:02.000 to assess the full arc. And beyond structural 00:17:02.000 --> 00:17:04.079 damage, the impact on performance and quality 00:17:04.079 --> 00:17:07.140 of life. It's significant. Studies consistently 00:17:07.140 --> 00:17:10.259 show a negative correlation between GRD and isokinetic 00:17:10.259 --> 00:17:12.799 strength, especially at higher speeds, crucial 00:17:12.799 --> 00:17:16.940 for throwing. Athletes with GRD are demonstrably 00:17:16.940 --> 00:17:20.039 weaker muscularly. This translates directly to 00:17:20.039 --> 00:17:23.400 reduced power, lower velocity, loss of control. 00:17:24.279 --> 00:17:26.660 Functionally limiting. And whilst the frequency 00:17:26.660 --> 00:17:28.539 of shoulder pain might not always be higher in 00:17:28.539 --> 00:17:31.339 GRD groups, the severity of pain measured on 00:17:31.339 --> 00:17:33.819 a VAS scale tends to be significantly greater 00:17:33.819 --> 00:17:36.359 when they do have pain. There's also a clear 00:17:36.359 --> 00:17:39.079 trend towards more upper body pain over all neck, 00:17:39.400 --> 00:17:41.680 back, elbow, wrist, likely due to compensations 00:17:41.680 --> 00:17:43.440 throughout the kinetic chain. And quality of 00:17:43.440 --> 00:17:46.289 life specifically. Yes, research using validated 00:17:46.289 --> 00:17:48.910 questionnaires like the SF -36 shows consistently 00:17:48.910 --> 00:17:51.930 lower scores for athletes with GRD across multiple 00:17:51.930 --> 00:17:54.670 domains. Physical function, their role limitation 00:17:54.670 --> 00:17:57.250 due to physical health, body pain levels, social 00:17:57.250 --> 00:17:59.410 functioning, general physical health, all tend 00:17:59.410 --> 00:18:01.849 to be lower compared to healthy athletes. It 00:18:01.849 --> 00:18:04.089 really highlights the broad impact GRD can have 00:18:04.089 --> 00:18:06.150 well beyond just the shoulder joint. It affects 00:18:06.150 --> 00:18:08.230 their ability to train, compete, and even function 00:18:08.230 --> 00:18:10.670 optimally in daily life. It can be quite debilitating 00:18:10.670 --> 00:18:13.279 psychologically too. That paints a very comprehensive 00:18:13.279 --> 00:18:16.460 picture of the ripple effects. So given this 00:18:16.460 --> 00:18:18.579 complex nature and the potential for widespread 00:18:18.579 --> 00:18:21.160 problems, what are the current best practices 00:18:21.160 --> 00:18:23.039 for treatment? Let's talk about conservative 00:18:23.039 --> 00:18:25.539 approaches first, then maybe surgery. Right. 00:18:25.680 --> 00:18:29.039 For the vast majority of patients with GRD, conservative 00:18:29.039 --> 00:18:31.380 management is definitely the first port of call. 00:18:31.500 --> 00:18:33.380 And thankfully, it's often highly effective. 00:18:33.819 --> 00:18:36.240 This usually involves a dedicated, structured 00:18:36.240 --> 00:18:39.299 physiotherapy program. Typically needs consistent 00:18:39.299 --> 00:18:42.220 effort over three to six months. And importantly, 00:18:42.619 --> 00:18:45.279 an initial period of relative rest from the aggravating 00:18:45.279 --> 00:18:47.859 activity throwing, serving is often needed to 00:18:47.859 --> 00:18:50.319 let things calm down and allow tissues to respond 00:18:50.319 --> 00:18:52.740 to treatment. And the cornerstone of that physio 00:18:52.740 --> 00:18:55.380 program. It's specific stretching, particularly 00:18:55.380 --> 00:18:57.599 targeting that tight postural inferior capsule 00:18:57.599 --> 00:19:00.640 to regain internal rotation. The sleeper stretch 00:19:00.640 --> 00:19:03.339 is foundational. Athlete lies on their side, 00:19:03.579 --> 00:19:06.160 affected shoulder down, arm abducted 90 degrees, 00:19:06.480 --> 00:19:09.799 elbow bent 90. Crucially, stabilize the scapula 00:19:09.799 --> 00:19:12.930 firmly against the table. Then, gently use the 00:19:12.930 --> 00:19:15.329 other arm to push the forearm down towards the 00:19:15.329 --> 00:19:18.329 table, internally rotating the shoulder. Feel 00:19:18.329 --> 00:19:20.029 the stretch deep in the back of the shoulder. 00:19:20.329 --> 00:19:23.450 Hold for 30 seconds. Repeat several times. Gentle, 00:19:23.630 --> 00:19:26.150 sustained stretch is key, not forcing it into 00:19:26.150 --> 00:19:28.400 pain. Making sure the stapula doesn't lift is 00:19:28.400 --> 00:19:30.720 vital, you said. Absolutely vital. Otherwise, 00:19:31.019 --> 00:19:33.059 you're not stretching the right structures. There's 00:19:33.059 --> 00:19:35.079 also the rollover sleeper stretch variation arm 00:19:35.079 --> 00:19:37.519 flex, maybe 60 degrees. Body rolled forward about 00:19:37.519 --> 00:19:39.920 30 degrees. Sometimes hits the capsule slightly 00:19:39.920 --> 00:19:42.420 differently. Other useful ones include the cross 00:19:42.420 --> 00:19:44.220 body adduction stretch, pulling the arm across 00:19:44.220 --> 00:19:46.579 the body, and stretches for the pectorals, like 00:19:46.579 --> 00:19:48.779 the doorway stretch, and specifically for pec 00:19:48.779 --> 00:19:51.039 minor, addressing tightness across the whole 00:19:51.039 --> 00:19:53.839 shoulder girdle. So stretching is key. What else 00:19:53.839 --> 00:19:56.299 is in the program? Beyond stretching, it must 00:19:56.299 --> 00:19:58.920 include rotator cuff and periscapular strengthening 00:19:58.920 --> 00:20:01.740 exercises. Absolutely crucial for addressing 00:20:01.740 --> 00:20:05.150 imbalances and improving dynamic stability. activity 00:20:05.150 --> 00:20:07.490 modification, understanding load management, 00:20:08.210 --> 00:20:11.369 various manual therapy techniques from the physiomobilizations, 00:20:11.809 --> 00:20:14.549 soft tissue work. Newer research also supports 00:20:14.549 --> 00:20:17.589 things like PNF stretching, instrumented manual 00:20:17.589 --> 00:20:20.549 therapy, myofascial release for improving flexibility 00:20:20.549 --> 00:20:23.450 and posterior tightness, and critically, as we 00:20:23.450 --> 00:20:25.869 keep saying, the therapy must address the entire 00:20:25.869 --> 00:20:28.849 kinetic chain. Lower limb strength, core stability, 00:20:29.289 --> 00:20:31.589 hip mobility, they're all integral to good throwing 00:20:31.589 --> 00:20:34.210 mechanics. weakness elsewhere overloads the shoulder. 00:20:34.369 --> 00:20:36.230 And the results of this conservative approach? 00:20:36.349 --> 00:20:39.490 Generally very positive. Up to 90 % of young 00:20:39.490 --> 00:20:41.529 throwers can respond well to these dedicated 00:20:41.529 --> 00:20:44.109 programs. They don't just improve IR and TRM, 00:20:44.210 --> 00:20:46.150 but studies show they can increase the acromial 00:20:46.150 --> 00:20:48.549 -humeral distance too, potentially helping with 00:20:48.549 --> 00:20:51.490 any associated subacromial impingement. Even 00:20:51.490 --> 00:20:53.150 short duration stretching right after pitching 00:20:53.150 --> 00:20:55.630 can restore range of motion, suggesting it's 00:20:55.630 --> 00:20:57.589 useful for immediate post -activity recovery 00:20:57.589 --> 00:21:00.779 too. That's encouraging. But what about the cases 00:21:00.779 --> 00:21:02.579 where conservative treatment doesn't work or 00:21:02.579 --> 00:21:05.480 there are significant associated injuries? When 00:21:05.480 --> 00:21:08.619 is surgery considered? Surgery is generally reserved 00:21:08.619 --> 00:21:11.779 for a small subset. Those who fail extensive 00:21:11.779 --> 00:21:14.779 non -operative therapy say three to six months 00:21:14.779 --> 00:21:17.700 of good quality physio with minimal improvement. 00:21:18.140 --> 00:21:21.519 Or those who have significant concomitant pathologies 00:21:21.519 --> 00:21:23.839 that clearly warrant surgical repair in their 00:21:23.839 --> 00:21:26.599 own right. Think certain types of unstable labral 00:21:26.599 --> 00:21:30.130 tears causing mechanical symptoms. or large symptomatic 00:21:30.130 --> 00:21:32.410 rotator cuff tears that haven't responded. And 00:21:32.410 --> 00:21:35.029 the surgical approach? Typically arthroscopic. 00:21:35.109 --> 00:21:37.390 Keyhole surgery. Allows excellent visualization 00:21:37.390 --> 00:21:40.250 and treatment through small incisions. Now, specifically 00:21:40.250 --> 00:21:41.950 for the posterior capsule tightness, there's 00:21:41.950 --> 00:21:44.369 some debate, posterior release versus anterior 00:21:44.369 --> 00:21:47.109 stabilization. However, for a throwing athlete 00:21:47.109 --> 00:21:49.609 with clear symptomatic postural inferior capsular 00:21:49.609 --> 00:21:52.069 contracture limiting function, we'd usually advocate 00:21:52.069 --> 00:21:54.490 for an arthroscopic release of that posterior 00:21:54.490 --> 00:21:57.049 inferior capsule in the posterior band of the 00:21:57.049 --> 00:21:59.269 inferior glenohumeral ligament. How is that release 00:21:59.269 --> 00:22:01.809 performed? We carefully release the capsule right 00:22:01.809 --> 00:22:04.309 off the glenoid rim, usually from about the 9 00:22:04.309 --> 00:22:06.490 o 'clock to 6 o 'clock position on a right shoulder. 00:22:07.130 --> 00:22:09.069 You need to see the rotator cuff fibers behind 00:22:09.069 --> 00:22:10.910 the capsule to know you've gone deep enough. 00:22:11.549 --> 00:22:14.549 Then an arthroscopic shaver widens the gap slightly 00:22:14.549 --> 00:22:17.650 to help prevent it scarring back down, followed 00:22:17.650 --> 00:22:20.630 by a gentle manipulation under anesthetic to 00:22:20.630 --> 00:22:23.009 maximize that regained internal rotation and 00:22:23.009 --> 00:22:25.390 flexion. You can get immediate gains of up to 00:22:25.390 --> 00:22:28.609 65 degrees, which could be quite dramatic. Wow, 00:22:28.789 --> 00:22:30.670 that's a significant change. What about repairing 00:22:30.670 --> 00:22:34.690 associated tears like SLAP lesions? For associated 00:22:34.690 --> 00:22:37.430 SLAP tears, especially type 2 where the anchor 00:22:37.430 --> 00:22:40.269 is unstable, arthroscopic repair is often done. 00:22:40.869 --> 00:22:43.130 Return to pre -injury performance levels is reported 00:22:43.130 --> 00:22:45.970 in over 70 % in some series. Sounds good, but 00:22:45.970 --> 00:22:48.430 outcomes can be variable. There's ongoing debate 00:22:48.430 --> 00:22:51.240 about the best technique. Some surgeons now favor 00:22:51.240 --> 00:22:53.720 biceps tenodesis, reattaching the biceps tendon 00:22:53.720 --> 00:22:56.380 lower down as potentially more reliable for pain 00:22:56.380 --> 00:22:58.220 relief and function, particularly in certain 00:22:58.220 --> 00:23:00.799 cases or older athletes. And rotator cuff tears 00:23:00.799 --> 00:23:02.660 and throwers, you mentioned outcomes are less 00:23:02.660 --> 00:23:05.799 predictable? Unfortunately, yes. For significant 00:23:05.799 --> 00:23:08.640 rotator cuff tears and lead throwers, surgical 00:23:08.640 --> 00:23:11.240 outcomes and return to play rates tend to be 00:23:11.240 --> 00:23:13.869 less favorable. often quite poor compared to 00:23:13.869 --> 00:23:16.690 non -throwing populations. It's likely due to 00:23:16.690 --> 00:23:18.930 the high demands, the chronic nature of the tears 00:23:18.930 --> 00:23:21.410 often leading to poor tissue quality, and the 00:23:21.410 --> 00:23:23.230 challenge of achieving robust healing that can 00:23:23.230 --> 00:23:26.089 withstand throwing forces. It remains a significant 00:23:26.089 --> 00:23:28.730 challenge. So the goal isn't necessarily a normal 00:23:28.730 --> 00:23:31.950 shoulder on scan. The overarching goal, especially 00:23:31.950 --> 00:23:34.029 in high -level throwers, is restoring them to 00:23:34.029 --> 00:23:36.490 their functional baseline with the minimum necessary 00:23:36.490 --> 00:23:39.490 intervention. Trying to make their shoulder anatomically 00:23:39.490 --> 00:23:42.430 normal like a non -athlete might not be achievable 00:23:42.430 --> 00:23:45.009 or even desirable given their specific adaptations. 00:23:45.789 --> 00:23:47.910 And post -operative rehabilitation is absolutely 00:23:47.910 --> 00:23:50.910 non -negotiable. It's long, several months, rigorous 00:23:50.910 --> 00:23:53.069 and absolutely crucial for regaining function 00:23:53.069 --> 00:23:56.109 and successful return to sport. Compliance is 00:23:56.109 --> 00:23:58.670 key. That's a really clear overview of the treatment 00:23:58.670 --> 00:24:01.049 pathway, balancing conservative care with surgical 00:24:01.049 --> 00:24:03.569 considerations. So bringing it all together now. 00:24:04.009 --> 00:24:06.670 What are the key strategies for actually preventing 00:24:06.670 --> 00:24:08.910 GIRD in the first place, especially with young 00:24:08.910 --> 00:24:11.869 athletes specializing so early? And what's the 00:24:11.869 --> 00:24:15.130 realistic long -term prognosis? Prevention is 00:24:15.130 --> 00:24:17.910 paramount, definitely, especially with the pressures 00:24:17.910 --> 00:24:21.109 on young athletes today. The first step is understanding 00:24:21.109 --> 00:24:23.910 the risk factors we discussed. High throwing 00:24:23.910 --> 00:24:27.349 volume, previous injury history, training intensity 00:24:27.349 --> 00:24:30.490 and duration. Recognizing at -risk individuals 00:24:30.490 --> 00:24:33.250 is key. So monitoring those factors. Yes. And 00:24:33.250 --> 00:24:35.390 then implementing effective prevention programs. 00:24:35.910 --> 00:24:38.430 These need a combination of approaches. Targeted 00:24:38.430 --> 00:24:40.349 stretching for tight structures, the sleeper 00:24:40.349 --> 00:24:42.930 stretch, cross -body stretch, consistently performed, 00:24:43.230 --> 00:24:45.390 not just a quick warm -up. Equally important, 00:24:45.869 --> 00:24:47.769 strengthening exercises for the rotator cuff, 00:24:48.150 --> 00:24:50.289 the scapular stabilizers, serratus anterior, 00:24:50.529 --> 00:24:53.150 traps, and the entire kinetic chain, core and 00:24:53.150 --> 00:24:55.990 lower limbs included. addressing any imbalances. 00:24:56.430 --> 00:24:58.269 Manual therapy techniques can also play a role 00:24:58.269 --> 00:25:00.410 in maintaining mobility. Structured programs 00:25:00.410 --> 00:25:04.250 seem essential then. Absolutely. Structured comprehensive 00:25:04.250 --> 00:25:06.609 injury prevention programs should be standard 00:25:06.609 --> 00:25:09.170 for athletes at all levels. They need to focus 00:25:09.170 --> 00:25:12.230 on enhancing dynamic stability, correcting muscular 00:25:12.230 --> 00:25:14.890 imbalances, ensuring proper throwing mechanics, 00:25:15.529 --> 00:25:17.490 overall athletic development, not just sport 00:25:17.490 --> 00:25:20.529 -specific skill, and crucially, regular monitoring. 00:25:20.730 --> 00:25:23.210 assessing shoulder range of motion periodically. 00:25:23.849 --> 00:25:25.990 This proactive screening allows early detection 00:25:25.990 --> 00:25:28.509 of GRD onset, perhaps before it even becomes 00:25:28.509 --> 00:25:31.150 symptomatic. This enables timely intervention, 00:25:31.289 --> 00:25:33.990 maybe adjusting training load, intensifying stretching, 00:25:34.450 --> 00:25:36.650 potentially preventing progression to a pathological 00:25:36.650 --> 00:25:38.910 state. Catching it early makes a huge difference. 00:25:39.150 --> 00:25:41.390 Makes sense. Be proactive. And the long -term 00:25:41.390 --> 00:25:44.829 outlook, the prognosis. For GRD, the prognosis 00:25:44.829 --> 00:25:46.829 largely depends on how promptly and effectively 00:25:46.829 --> 00:25:49.559 it's treated. As we said for most, Conservative 00:25:49.559 --> 00:25:51.920 management with dedicated physiotherapy is highly 00:25:51.920 --> 00:25:54.319 effective. Recovery takes time, several months 00:25:54.319 --> 00:25:56.900 usually, but a significant majority respond well 00:25:56.900 --> 00:25:58.880 and return to the previous level. And for those 00:25:58.880 --> 00:26:00.640 needing surgery? For the smaller group needing 00:26:00.640 --> 00:26:02.900 surgery, the prognosis can still be favorable. 00:26:03.880 --> 00:26:06.279 But return to pre -injury performance levels 00:26:06.279 --> 00:26:09.640 really hinges on strict adherence to those comprehensive, 00:26:10.220 --> 00:26:13.160 lengthy post -operative rehab protocols. It requires 00:26:13.160 --> 00:26:15.839 immense dedication. And even then, sometimes 00:26:15.839 --> 00:26:18.400 return is to a slightly modified level. especially 00:26:18.400 --> 00:26:21.400 after major repairs. Long -term shoulder health, 00:26:21.599 --> 00:26:23.940 minimizing recurrence, also requires ongoing 00:26:23.940 --> 00:26:26.059 attention to other risk factors, strength and 00:26:26.059 --> 00:26:28.920 balances, scapular control. It's not a one -time 00:26:28.920 --> 00:26:31.460 fix. It's about continued management and proactive 00:26:31.460 --> 00:26:34.019 care throughout their career. What an incredibly 00:26:34.019 --> 00:26:36.519 insightful deep dive into glenohumeral internal 00:26:36.519 --> 00:26:39.539 rotation deficit. Your expertise has truly illuminated 00:26:39.539 --> 00:26:42.200 that journey from adaptation to pathology and 00:26:42.200 --> 00:26:44.240 the comprehensive strategies available for our 00:26:44.240 --> 00:26:47.490 medical community. Understanding GID really isn't 00:26:47.490 --> 00:26:49.549 just about treating a symptom, is it? It's about 00:26:49.549 --> 00:26:51.849 optimizing an athlete's longevity, their performance, 00:26:51.950 --> 00:26:54.730 and their overall quality of life. It is a fascinating 00:26:54.730 --> 00:26:58.190 area. It constantly reminds us of the body's 00:26:58.190 --> 00:27:01.390 remarkable ability to adapt but also highlights 00:27:01.390 --> 00:27:04.430 the critical need for precise assessment and 00:27:04.430 --> 00:27:06.970 intervention when those adaptations become detrimental. 00:27:07.730 --> 00:27:10.009 Distinguishing the physiological from the pathological 00:27:10.009 --> 00:27:12.720 remains the key clinical challenge. If you found 00:27:12.720 --> 00:27:15.079 this deep dive invaluable, please do consider 00:27:15.079 --> 00:27:17.559 rating and sharing it with your colleagues. Your 00:27:17.559 --> 00:27:19.400 insights help us reach more professionals like 00:27:19.400 --> 00:27:22.079 you, grappling with these complex issues. And 00:27:22.079 --> 00:27:24.500 a final thought, as we continue to push the boundaries 00:27:24.500 --> 00:27:26.900 of human performance and our scientific understanding 00:27:26.900 --> 00:27:29.559 grows, how might our approach to these subtle 00:27:29.559 --> 00:27:32.579 adaptive changes evolve? What new frontiers in 00:27:32.579 --> 00:27:34.920 prevention, perhaps using wearable tech or advanced 00:27:34.920 --> 00:27:37.900 biomechanics or even personalized treatment strategies, 00:27:38.259 --> 00:27:39.819 might we see emerging in the coming years?