A seemingly common but, at least to the best of my knowledge, unknown musculoskeletal injury mechanism, is infraspinatus impingement at the subacromial passage. The superior portion of the infraspinatus passes partially under acromial roof (the acromial bone), and in internal rotation of the humerus, an even greater amount of the infraspinatus tendon will be exposed to potential impingement at this passage during excessive scapular downwards rotation during elevation of the arms.
The most vulnerable part of the infraspinatus is the superior portion due to aforementioned reasons. Unfortunately, it is also the most difficult part of the infraspinatus to target with rehabilitative exercises, and it is especially important to understand that standard external rotations will not tend to effectively target these tissues. The reason for this, is that its superior attachment on the humeral head makes it an angled abductor to a greater degree than an external rotator. I have some preliminary suggestions for treatment in this video. Some refinements may be posted at a later time.
3 июн 2023
