Which Factors Influence the Outcome After Anatomical and Reverse Shoulder Arthroplasty?

This study is collecting information from patients who are undergoing shoulder replacement surgery (shoulder arthroplasty) to understand what factors influence how well patients do afterward. There are two main types of shoulder replacement — anatomical (which replaces the shoulder joint in its natural orientation) and reverse (where the ball-and-socket are switched, often used for patients with rotator cuff problems). Researchers want to identify which patient characteristics, health conditions, and surgical details predict the best outcomes. This is an observational registry study, meaning it does not test a new treatment but instead tracks outcomes from standard surgeries. All adults scheduled for their first (primary) shoulder replacement are eligible to participate. You may be eligible if: - You are 18 years of age or older - You are scheduled for a primary (first-time) shoulder arthroplasty (either anatomical or reverse) You may NOT be eligible if: - You are having revision surgery (a repeat surgery to fix or replace a previous shoulder implant) Talk to your doctor to see if this trial is right for you.