Arthroscopic Trillat Coracoid Transfer Procedure Using a Cortical Button for Chronic Anterior Shoulder Instability.

The Trillat procedure has been proposed to treat chronic anterior shoulder instability by performing a closing wedge osteotomy of the coracoid process fixed with a coracoscapular screw above the subscapularis. The goal of this osteotomy is to distalize and medialize the coracoid tip to place the conjoint tendon in front of the glenohumeral joint. This in turn distalizes and reinforces the subscapularis in abduction and allows the conjoint tendon to act as a sling and push the humeral head posteriorly.