A Clinical Investigation of the Copeland™ Humeral Resurfacing Head

Inclusion Criteria: * Non-inflammatory degenerative joint disease including osteoarthritis and avascular necrosis. * Rheumatoid arthritis * Correction of functional deformity * Reconstructable Rotator Cuff * Treatment of acute fracture of the humeral head * Traumatic arthritis Exclusion Criteria: * Patients less than 18 years. * Patients with rapid joint destruction, osteomalacia, osteoporosis, or marked bone loss, which would preclude proper fixation of the prosthesis. * Patients with marked bone loss apparent on roentgenogram. * Metabolic disorders, which may impair bone formation. * Patients who are pregnant. * Patients with an active or suspected infection in or around the shoulder or distant foci of infections, which may spread to the implant site. * Patients with severe instability or deformity of the ligaments and/or surrounding soft tissue, which would prelude stability of the prosthesis. * Patients who have had revision procedures where other devices or treatments have failed. * Patients with a highly communicable disease or diseases that may limit follow-up (e.g. immuno-compromised conditions, hepatitis, active tuberculosis, neoplastic disease, etc). * Patients unwilling or unable to comply with a rehabilitation program for a cemented or cementless partial or total shoulder replacement or who indicate difficulty or inability to return for follow-up visits prescribed by the study protocol. * Patients with previous shoulder surgery or conditions that may interfere with the partial or total shoulder replacement's survival or outcome. * Patients who qualify for inclusion in the study, but refuse consent to participate in the study. * Patients who have had a partial or total shoulder arthroplasty on the contralateral shoulder within the last year.