Primary Arthroplasty of the Shoulder

The shoulder has a unique capacity for motion because of (a) the stable and painless articulation between the glenoid and humeral head, (b) a subdeltoid space that is free of restricting structures, and (c) the integrated action of the acromioclavicular, sternoclavicular, and scapulothoracic articulations. The critical contribution of the soft tissues surrounding the glenohumeral joint cannot be over-emphasized. The glenoid surface is only slightly curved, and its surface area is about 25% that of the humeral head.

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