The rotator interval is the triangular space between the anterior supraspinatus and superior subscapularis tendons, spanning from the coracoid to the bicipital groove. It is reinforced by the coracohumeral and superior glenohumeral ligaments and the biceps long head tendon pulley (biceps sling). Contracture of the rotator interval in adhesive capsulitis produces the loss of external rotation in adduction that is the first motion restricted in frozen shoulder.
Houses the biceps long head tendon pulley; restrains inferior translation; contributes to external rotation limit in adduction
Rotator interval release is a key component of arthroscopic adhesive capsulitis treatment, specifically restoring the external rotation in adduction that is lost from rotator interval contracture. Rotator interval closure (plication) is performed in shoulder instability surgery to reduce inferior capsular laxity. The coracohumeral ligament, the primary structure of the interval, can be released to improve external rotation in stiff shoulders.
CHL and rotator interval fibrosis in adhesive capsulitis producing external rotation loss in adduction as the first sign, managed with arthroscopic interval release.
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