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Abstract

Background: While considerable focus has been given to address glenoid morphology and version in anatomic total shoulder arthroplasty (TSA), there has been little attention paid to the potential impacts of humeral version on postoperative outcomes. The purpose of this study is to assess the impact of matching native humeral version on postoperative range of motion (ROM) after anatomic TSA.

Methods: All anatomic TSAs performed by a single surgeon between September 2021 and June 2023 were retrospectively reviewed. Patients undergoing TSA for fracture and/or revision TSA were excluded. This study group consisted of 20 patients whose native humeral version was measured on a preoperative computed tomography (CT) scan and compared to eight patients whose preoperative version was not measured. Primary outcome variables included forward flexion, external rotation at the side, and internal rotation at final follow-up. Rate of complication was also compared between cohorts.

Results: There were no significant differences in age, sex, body mass index, preoperative ROM, or glenoid version. The control cohort did have significantly longer follow-up than the study cohort. There was no significant difference in humeral version established intraoperatively, nor were there differences in forward flexion, external rotation, or internal rotation at two weeks, six weeks, three months, one year, or at final follow-up. Rate of complication was not significantly different between cohorts.

Conclusion: Measuring preoperative humeral version on CT scan did not significantly change the humeral component version established intraoperatively. Attempting to match native humeral version intraoperatively did not significantly affect ROM at final follow-up, nor rate of complication.

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