Advanced Glenohumeral Osteoarthritis

The goal of this clinical trial is to assess if concomitant open pectoralis minor release would improve pain and outcomes after Reverse Shoulder Arthroplasty (RSA). The main questions it aims to answer are: * whether releasing the pectoralis minor prophylactically could have better pain relief * whether releasing the pectoralis minor prophylactically could have increased Range of motion (ROM) outcomes * whether releasing the pectoralis minor prophylactically could have higher final Patient Reported Outcome Measurements (PROMs) Participants will be randomized to either undergo RSA with pectoralis minor release or RSA without pectoralis minor release.