Magnetic Resonance Imaging Appearance

The bony anatomy of the shoulder joint does not inher-ently provide stability. The glenoid fossa is a flattened, dish-like structure, and only one fourth of the large humeral head articulates with the glenoid at any given time. According to a study by Howell and Galinat,4 the gle-noid is deepened by 50 % by the glenoid labrum, and the labrum increases humeral contact to 75%. Fehrenger et al1 and Lippett and Matsen9 believed the labrum may serve as a “chock block ” that prevents excessive humeral head rollback. Treatment for anterior glenohumeral insta-bility must effectively address the anterior band of the inferior glenohumeral ligament (IGHL), Bankart lesion, and additional capsular injury. Capsulolabral augmenta-tion is designed to increase glenohumeral stability by 2 separate mechanisms: deepening the glenoid concavit