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Biomechanics of Shoulder Stability-Superior Glenohumeral Ligament

The superior glenohumeral ligament (SGHL) and coracohumeral ligament (CHL) originate on the supraglenoid tubercle and coracoid process, respectively, and both insert on the lesser tuberosity. Both make up the reinforcing structures of the rotator interval and are present in over 90% of individuals.

These structures both provide resistance to inferior translation and external rotation when the arm is adducted. Additionally, both structures limit posterior translation when the arm is forward flexed, adducted, and internally rotated. Lastly, the SGHL and the CHL are believed to prevent anterior-superior migration of the humeral head.

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