Wear rates of 32 mm and 40 mm glenospheres in a reverse total shoulder arthroplasty in vitro wear simulation model

Purpose: Larger glenosphere diameters have been shown to increase prosthesis stability and impingement-free range of motion in reverse total shoulder arthroplasty (rTSA). Higher wear rates increase the potential for polyethylene wear-induced osteolysis and aseptic component loosening. The goal of this study is to evaluate the rate of polyethylene wear for 32 mm and 40 mm glenosphere sizes utilized in rTSA. It is hypothesized that increased polyethylene wear occurs with larger glenosphere diameters.