Catalyst CSR Shoulder System for Semi or Total Shoulder Arthroplasty

Inclusion Criteria:

• 18 years of age or older

• Patient must be skeletally mature with degenerative disease of the glenohumeral joint where hemi or total shoulder arthroplasty

• Meets the Catalyst CSR Shoulder System Indications for Use according to approved labeling

Exclusion Criteria

• Has a history of open surgery to index shoulder prior to treatment with the Catalyst CSR system? (history of previous arthroscopic surgery allowed)

• Has a full thickness rotator cuff tear diagnosed by MFI or marked posterior glenoid wear

• Patient is unwilling or unable to comply with the post-operative care instructions, attend follow visits per the study schedule and complete the study assessments (i.e., Pros)

• The patient is a non-English speaker

• In the opinion of the investigator, is it not in the patient's best interest to participate in this study

• Local or systemic infection, or osteomyelitis of the proximal humerus or scapula; if a systemic infection or a secondary remote infection is suspected or confirmed, joint replacement surgery should be delayed until infection is resolved

• Inadequate or malformed bone that precludes adequate support of fixation of the prosthesis

• Osteoporosis

• Neuromuscular disorders that do not allow control of the joint

• Chronic instability, chronic dislocation or deficient soft tissues and other support structures (e.g., brachial plexus or deltoid muscles)

• Vascular insufficiency

• Subject's age, weight or activity level cause the surgeon to expect early failure of the system

• The patient is unwilling to comply or unable to comply with the post-operative care instructions

• Alcohol, drug, substance abuse or other conditions that would affect or impair the patient from complying with post-operative instructions

• Patients with known sensitivity to Co-Cr-Mo alloys typically used prosthetic devices

• Any disease that could adversely affect the function or expected longevity of the implants (e.g., metabolic disorders)