These authors sought to determine if glenoid peg perforation was associated with an increased rate of glenoid component loosening and whether glenoid peg perforation was associated with inferior clinical outcomes. They performed a case-control retrospective review comparing 25 total shoulder arthroplasties (TSAs) in which one or multiple pegs perforated the medial glenoid vault (uncontained group) with 25 TSAs without peg perforation (contained group). Average clinical follow-up was more than 5 years.
Initially the authors had intended to obtain radiographs at two or more years after surgery. However, a large number of patients were unable to obtain satisfactory x-rays and this aspect of the study was abandoned.
No patient in either group was known to have had revision for glenoid loosening.
Two (8%) patients in the uncontained group required revision for rotator cuff tears. The glenoid components were secure in both.
Penn and ASES scores were significantly lower in the unconfined group. Pain and satisfaction subscores were similar between the groups, but function subscores were significantly lower in the unconfined group.
Comment: Readers may be interested in a previous post discussing glenoid perforation and its possible consequences.
It seems likely that the poorer functional results in the 25 TSAs with peg penetration were due to disease severity and not to the peg penetration. This view is somewhat reinforced by the observation that both shoulders requiring revision for cuff failure were in the penetration (uncontained) group.
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