Acute Failure of a Glenoid Component in Anatomic Shoulder Ar
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Glenoid loosening is the most common cause of failure in primary total shoulder arthroplasty (TSA) and often occurs years after the initial surgery. It is rare for a glenoid component to fail acutely. Several case reports of complete glenoid dissociation appear in the literature. It is important to report these failures to identify technical errors or component design flaws to improve outcomes in TSA. In this case report, we present an unrecognized acute failure of a cemented hybrid glenoid component at the time of surgery.

Case Report
The patient is a 65-year-old man referred to the senior author's clinic with persistent right shoulder pain and severely restricted range of motion approximately 10 months after a primary anatomic TSA. The indication for the primary procedure was longstanding severe osteoarthritis with an intact cuff. The Exactech Equinoxe (Exactech Inc., Gainesville, FL) shoulder system was used for the index procedure, with a pegged, caged glenoid (model number 314-02-04). Utilizing a standard deltopectoral approach, a 15?mm press fit humeral stem with a 47 × 18 humeral head, offset with a 4.5?mm replicator plate and a large beta curvature, pegged glenoid with cage was implanted. No complications had been noted at the time of the primary procedure.

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