Glenoplasty for recurrent posterior shoulder instability. An anatomic reappraisal.

Posterior glenoplasty, as performed for the treatment of recurrent posterior shoulder instability, was shown to thrust the humeral head forward and was able to cause symptomatic impingement of the anterior cuff between the coracoid process and the humeral head. Such subcoracoid impingement is relieved by resection of the inferolateral part of the coracoid tip and of the coracoacromial ligament.