Arthritic Shoulder, Posterior View

Description

Posterior shoulder anatomy is rendered as a close skeletal dissection centered on the glenohumeral articulation. The scapula forms the posterior wall of the joint, with the glenoid cavity positioned lateral to the scapular spine and the acromion projecting superiorly over the humeral head, while the clavicle meets the acromion at the acromioclavicular joint. Irregular osteoarthritic contouring is emphasized along the posterior glenoid rim adjacent to the articular surface, with corresponding degenerative change on the posteroinferior quadrant of the humeral head. Bony overgrowth and marginal roughening crowd the joint line. Clear landmarks. Posterior rim pathology matters because it tracks with posterior glenoid wear and posterior humeral head subluxation seen in primary glenohumeral osteoarthritis, the pattern many surgeons think about when templating total shoulder arthroplasty and planning glenoid correction. Loss of articular cartilage and marginal osteophytes alter joint congruence, limit external rotation, and can drive pain with cross-body adduction and loading in flexion, findings that often correlate with posterior joint line tenderness and stiffness on exam. This viewpoint also highlights why a posterior capsulolabral complex that normally deepens the socket can become mechanically disadvantaged when the bony rim develops osteophytes or erosion. Use this asset in musculoskeletal anatomy courses to teach scapular and proximal humeral landmarks in true posterior orientation while tying them to degenerative joint disease. It also suits orthopaedic and sports medicine lectures, arthroplasty planning primers (posterior glenoid wear patterns, version, and rim osteophyte debridement), and publisher figures discussing glenohumeral osteoarthritis versus instability-related sequelae in adult males. Anatomical accuracy verified by SciePro's Medical Advisory Board.