The effect of glenoid version on internal and external rotation in reverse total shoulder arthroplasty

Abstract Background There is currently limited understanding of the contribution of glenoid version to postoperative internal (IR) and external rotation (ER) after reverse total shoulder arthroplasty (RTSA). The purpose of this study was to determine the impact of glenoid version on postoperative rotation after RTSA. Methods Forty-five 3-dimensional (3D) computer models of human scapulae were created from de-identified computed tomography (CT) scans. The scapulae were divided into 3 separate groups based on glenoid version: normal (10° to -10°), moderate (-10 to -25°), and severe ( Results Glenoids with a narrow width ( Conclusion Placement of the glenoid component in increasing retroversion during RTSA results in a loss of IR and a corresponding increase in ER. Level of Evidence Basic Science Study