This study aims to gather information on shoulder replacement surgeries using the Shoulder Innovations (SI) Total Shoulder System. It is an observational study, meaning researchers watch and collect data without changing anything. Arthroplasty is a type of surgery to replace a joint, in this case, the shoulder. The study looks at both anatomic and reverse shoulder replacements. Anatomic means the new joint is like the original, while reverse switches the ball and socket parts. The registry will track patients for up to 10 years after surgery to see how well their shoulders work and how the implant looks on X-rays.

• Participants must be at least 18 years old and have had or plan to have shoulder replacement surgery with an SI device.
• The study involves regular check-ups and answering questions about your shoulder's function.
• It requires a commitment to follow-up visits for up to 10 years.