Evaluation of Humeral and Glenoid Bone Deformity in Glenohumeral Arthritis
Glenohumeral arthritis is the sequela of a variety of pathologic shoulder processes, most commonly degenerative osteoarthritis, but may also be secondary to post-traumatic conditions, inflammatory arthritis, rotator cuff tear arthropathy, and postsurgical conditions most commonly post-capsulorrhaphy arthritis. Patients with glenohumeral arthritis commonly demonstrate patterns of bony deformity on the glenoid and humerus that are caused by the etiology of the arthritis. For example, osteoarthritis commonly presents with posterior glenoid wear, secondary glenoid retroversion, and posterior humeral head subluxation, while inflammatory arthritis routinely causes concentric glenoid wear with central glenoid erosion. A thorough history and physical, as well as laboratory and radiographic workup, are keys to understanding the etiology of arthritis and understanding the secondary bony deformity of the glenohumeral joint. Understanding the etiology and pattern of glenoid bone wear helps the surgeon formulate a successful treatment plan and surgical goals to address the pathoanatomy and improve the durability of shoulder arthroplasty. The evaluation of humeral and glenoid bone deformity in glenohumeral arthritis has profound surgical implications and is fundamental to successful shoulder arthroplasty.
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