Revision instability surgery.

Revision instability is a complex clinical problem. A successful outcome is dependent on several factors, including an accurate diagnosis clearly delineating the different pathologic conditions contributing to the failure. Also, from a technical aspect, an attempt should be made to restore the normal anatomic relationships while achieving glenohumeral stability in a functional range of motion. The purpose of this article is to assist the clinician in the evaluation and treatment of failed instability surgery by combining the authors' personal experience with an extensive review of the literature.