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Superior Glenohumeral Ligament

The SGHL originates on the supraglenoid tubercle, just anterior to the origin of the long head of the biceps, and it inserts on the proximal tip of the lesser tuberosity, on the medial ridge of the intertubercular groove. The SGHL is present in more than 90% of individuals. In an anatomical study, Steinbeck et al. It found the SGHL to be missing in 6% of the specimens, and in 17% of the specimens, the SGHL had a common origin with the MGHL, at the one-o’clock position on the glenoid labrum.

The SGHL runs parallel to the coracohumeral ligament (CHL), and it reflects around the biceps tendon, serving as an internal pulley at the floor of the rotator interval (RTI). During a selective sectioning study, the SGHL was found to be an important inferior stabilizer of the adducted shoulder. In addition, it limits posterior translation with the arm in forward flexion, adduction, and internal rotation, and it prevents anterosuperior migration of the humeral head.

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