Range of motion after reverse shoulder arthroplasty: which combinations of humeral stem and glenosphere work best?
Abstract A variety of changes in prosthetic design have been proposed to address the complications of Grammont-style reverse shoulder arthroplasty (RSA). The Grammont RSA is excellent at restoring forward flexion, but often leads to little improvement in external and internal rotation. The purpose of this review was to analyze the effect of different glenoid and humeral configurations on range of motion (ROM) following RSA. With low neck-shaft angle (135–145 degrees), glenosphere lateralization, and eccentricity, elevation remains unchanged, abduction slightly decreases, but a dramatic improvement in adduction, extension, and rotations with the elbow at the side are observed. However, all prosthetic designs should be considered on a case-by-case basis to optimize outcome.