When the glenoid component of a total shoulder is placed in a low and superiorly inclined position, it cannot stabilize the humeral head against the upwardly directed force of the deltoid. The resulting superior displacement of the humeral head can result in failure of the rotator cuff. Such a phenomenon is demonstrated in the radiograph below.
Removal of the glenoid component and cement left a large defect in the scapula.
The humeral head was revised to a CTA head with an extended articular surface. This improved the centering of the humeral joint surface on the glenoid and enabled immediate postoperative active assisted elevation.
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