Abstract
BACKGROUND: The aim of this study is to identify risk factors for prolonged operative duration in anatomic total shoulder arthroplasty (ATSA) and reverse total shoulder arthroplasty (RTSA) for patients with glenohumeral osteoarthritis (GHOA). METHODS: A retrospective chart review of electronic medical records was conducted to identify patients who underwent shoulder arthroplasty for GHOA by one of six surgeons across two academic institutions between 2017 and 2023. Multivariate linear regression was used to identify factors associated with operative duration. RESULTS: In total, 513 patients underwent primary ATSA, and 528 underwent primary RTSA. The mean operating room (OR) time was significantly longer in patients undergoing ATSA (183.5 ± 39.5 minutes) compared to those undergoing RTSA (150.5 ± 33.4 minutes). For ATSA, older patient age, male sex, increased body mass index, lower Charlson comorbidity index (CCI), increased preoperative retroversion, increased preoperative inclination, and a glenoid Walch classification of B2 or B3 were significant predictors of OR time. For RTSA, younger patient age, lower CCI, and increased preoperative retroversion were significant predictors of OR time. CONCLUSION: ATSA has a significantly longer mean OR time than RTSA for the treatment of isolated GHOA. Preoperative demographic and radiographic data can be used to predict operative duration.