Biomechanical study using surrogate bone models and electronic goniometry testing seven reverse shoulder arthroplasty configurations to determine how glenosphere center of rotation offset — the distance from the glenoid surface to the geometric center of the glenosphere — affects abduction range of motion and the location of impingement points.
When selecting a reverse shoulder glenosphere, recognize that lateralizing the center of rotation (larger offset from glenoid) linearly increases abduction arc — but also weigh that a more medial center of rotation may improve baseplate fixation and stability in cases with bone loss or instability risk, where ROM maximization is not the primary goal.
Biomechanical study using surrogate bone models and electronic goniometry testing seven reverse shoulder arthroplasty configurations to determine how glenosphere center of rotation offset — the distance from the glenoid surface to the geometric center of the glenosphere — affects abduction range of motion and the location of impingement points.
When selecting a reverse shoulder glenosphere, recognize that lateralizing the center of rotation (larger offset from glenoid) linearly increases abduction arc — but also weigh that a more medial center of rotation may improve baseplate fixation and stability in cases with bone loss or instability risk, where ROM maximization is not the primary goal.