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Rotator Interval

The rotator interval is the region of the shoulder defined by the borders of the supraspinatus superiorly, the subscapularis inferiorly, the corcoid process medially, and biceps laterally. The SGHL, CHL, and MGHL reinforce the rotator interval region. As a result, this region is highly variable among individuals. The rotator interval may be completely devoid of tissue or composed solely of loosely arranged collagen tissue; in a stable shoulder, this likely represents a normal variant.

The rotator interval functions to limit inferior translation in the adducted arm, and tightens when the adducted arm is externally rotated. Laxity in the rotator interval may contribute to inferior and posterior glenohumeral instability. At the other end of the spectrum, an excessively tight rotator interval is associated with both adhesive capsulitis and post-operative stiffness.

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