This study aims to find out if releasing a muscle called the pectoralis minor can help reduce pain and improve movement after a shoulder surgery called Reverse Shoulder Arthroplasty (RSA). RSA is a surgery where the shoulder joint is replaced to help with shoulder pain and movement. Sometimes, even after this surgery, patients still feel pain and have trouble moving their shoulders. The study will compare two groups: one with the muscle released during surgery and one without. The main focus is on seeing if releasing the muscle helps with pain relief, better shoulder movement, and improved outcomes reported by patients themselves. Participants will be randomly chosen for either group.

• Participants need to be adults having RSA surgery.
• Study involves comparing two surgical methods during RSA.
• Potential participants should not be pregnant or imprisoned.

Eligibility: Adults having RSA surgery who can give consent. Not eligible if revising previous surgeries, have certain fractures, or are underage.