Factors contributing to glenoid baseplate micromotion in reverse shoulder arthroplasty: a biomechanical study

This is a biomechanical study evaluating the micromotion of a baseplate in a reverse shoulder arthroplasty during simulated abduction. We tested the following factors: bone density, screw length, number of screws, screw angle, and central peg length. Our findings corroborate the importance of higher bone densities, longer central peg length, and greater peripheral screw length in improving initial fixation of the baseplate.