Name: Shoulder Special Test: Jerk Test
Uploaded: 2023-04-26T01:02:54.000Z
Duration: 5 min 49 s
Description: This video tutorial explains the Jerk Test, a special test used to evaluate shoulder injuries and assess potential instability. Learn how to perform the test accurately to best diagnose shoulder issues.

English captions

https://stream.mux.com/ZDqFhpZfH32LPlOnfbBWq3OYBN3iTN02xO3TASd4aAwE.m3u8

This video tutorial explains the Jerk Test, a special test used to evaluate shoulder injuries and assess potential instability. Learn how to perform the test accurately to best diagnose shoulder issues.

Introduction to the Jerk Test for Shoulder Assessment

Demonstration of Jerk Test Mechanics

Interpreting Jerk Test Results and Follow-Up Tests

Integrating Test Results in Patient Diagnosis and Treatment

Conclusion and Recommendations for Practitioners

Shoulder Special Test: Jerk Test

This is Brent of the Brookbush Institute, and in this video we're doing the jerk test. A special or orthopedic test for the shoulder, that helps us indicate a posterior inferior labral lesion. I'm going to have my friend Melissa come out, she's going to help me demonstrate. Now this is kind of tricky, we have to combine some actions that are not so easy to combine; which is stabilization of the scapula, we have to compress the humeral head into the glenoid fossa, and then we're going to simultaneously horizontally adduct the humerus. So here's what that looks like. We're going to take this hand the hand closest to the patient and we're going to put it right over the top of the scapula, and then our palm down over the back of the scapula. We're going to take our other hand using our lumbrical grip, that little crab or lobster grip, we're going to put that right over the elbow. Now we're going to start at 90 degrees of abduction, and roughly 90 degrees of shoulder internal rotation here, and I'm now going to press her humerus into her glenoid fossa. So my force will always be directed in line with the humerus itself, an axial load so to speak, and so we're going to push in this way, and then here's where it gets tricky. Maintaining that load I'm going to horizontally adduct the humerus, while asking my patient  does that replicate your symptoms? Yeah. that's what you were complaining about. Where do you feel that? In the back of her shoulder. Alright so a positive Jerk test is the onset of pain in the back of the shoulder, with or without clicking. Of course clicking you can either hear or feel as you're going through the test. The most important thing is it does it replicate your patient symptoms. I'll show you guys a couple of other views here. Let me have you move this way Melissa. I just want you guys to clearly see the mechanics of this. Notice hand, top and then bracing the back of your scapula. I also have good control over her torso here. I'm then going to use this grip over her elbow, and then notice i get my elbows up nice and high so that my forearms match my directions of force pretty good. This is going to make it a lot easier on me, and then all i have to do is take a step and I can take her into a horizontal adduction, while maintaining that force in line with the humerus, compressing the humeral head, and I'm going to ask her is that the symptoms you were talking about? Where do you feel that? In the back of your shoulder, all right positive Jerk test. Alright go ahead and flip all the way around .One last view of my mechanics here. So this hand over the top stabilizing the back of the scapula. This hand over the top of her elbow, bracing her humerus, I've got good control here, I'm going to get my elbows up nice and high. I'm just going to take a step as I continued to compress her humeral head into her glenoid fossa, and of course all the while I'm asking does that match the symptoms you were talking about, is that what you were complaining about, where did you feel that. Alright, thank you Melissa. Now if I'm doing the Jerk test that's just one clue towards an assessment or diagnosis of what may be contributing to my patients complaints, I'm going to do other tests to confirm this assessment or diagnosism chances are if I've done the Jerk test I'm also going to do the Kim's test, because that's my other posterior inferior labral lesion test. Chances are I've already done my SLAP lesion tests. Things like the O'Briens active compression test and and maybe even Speeds, but I want to make sure that as I'm putting this together, I'm putting all my clues together, I have some negatives to ensure that it's not that diagnosis, it's not like a SLAP tear. Maybe I've done my impingement tests, my rotator cuff tests, and I know if those are negative but these are positive I'm really really on the right track. Now chances are you're going to get a mixed bag, and you're also going to have to match it up with a subjective evaluation. Now why is this all important, with our diagnostic testing you have to keep in mind is this patient going to get better with conservative treatment, i.e manual therapy and exercise. Or should I refer out to a physician, because there's a chance that we need some imaging maybe to make a better decision. Or is there a chance that surgical intervention is actually going to be the better solution for this patient right. You don't necessarily have to make that decision, if you are leaning towards a significant labral lesion that could need surgical intervention, personally I would go ahead and refer up to a physician, try to get some imaging, maybe talk with that physician and may be jointly we decide whether we should try conservative treatment at all, or we should skip straight to surgical intervention. I hope you guys enjoyed this video, give this test a try, it's a little tricky. I would practice it before using it in the clinic. If you have any questions leave a comment below. 

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Special tests for shoulder instability. The Apprehension Test, Jobe's Relocation Test, Composite SLAP Tear Test-item Cluster, Jobe's Relocation Test (Apprehension Tests), Biceps Load 2, Obrien's Active, Compression Test, Posterior Inferior Labral Lesion, Jerk Test, Speed's Test, Yergason's Test, Compression Rotation Test, Kim's Test. The reliability, specificity, sensitivity, validity, safety, and screening for shoulder pain, instability, labral tears, glenohumeral (shoulder) joint stability, SLAP tears, AC (acromioclavicular) joint pathology, and posterior to inferior labral lesions.

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