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Dramatically depicts degenerative disease of the acromioclavicular, or ac, joint in the left shoulder with arthroscopic surgery repairs. Shows impingement of the supraspinatus muscle, a rotator cuff muscle, and a torn supraspinatus tendon. Surgical steps: A. Arthroscopic instruments  inserted into the shoulder joint; B. Coracoacromial ligament is released and a high speed bur is used to reshape the clavicle; C., D. and E. Smoothing of the bone surface and suturing of the muscle tendon.