Onlay Versus Inlay Humeral Component in Reverse Total Shoulder Arthroplasty

This study aims to determine if active external rotation two years postoperatively varies based on whether an inlay or onlay humeral component is used in reverse shoulder arthroplasty (RTSA). The study also aims to determine whether active forward elevation, abduction, scapular notching, and functional outcomes two years postoperatively vary based on whether an inlay or onlay humeral component is used in reverse shoulder arthroplasty. Patients undergoing primary RTSA by Dr. J. Michael Wiater, Dr. Brett Wiater, or Dr. Alexander Martusiewicz at Beaumont Health will be screened for eligibility. Following informed consent, participants will be randomised (1:1) to one of the following groups: 1) RTSA with inlay humeral component (Tornier Perform Stem Reverse+) or 2) RTSA with onlay humeral component (Tornier Ascend Flex stem). At baseline, participants will complete study questionnaires, receive a range-of-motion (ROM) exam, and standard of care x-rays and computed tomography (CT) scans. These evaluations will be repeated at 3 months, 12 months and 24 months.