Prosthetic arthroplasties of the shoulder.

Twenty-two Neer shoulder arthroplasties were performed in rheumatoid and osteoarthritic patients and followed for a minimum of two years, with an average of four years, seven months. In addition to the Neer humeral prosthesis, eight had Neer glenoid components and seven had a subacromial spacer inserted. Two years postoperation, 11 patients had no pain and eight had only mild discomfort. Shoulder function improved more than 100% compared with the preoperative ratings while the range of motion increased relatively little. There was one failure. Although the hemiarthroplasty group scored similarly to the total shoulder group, total shoulder arthroplasty is preferred because of possible further glenoid deterioration. A subacromial spacer is used if the rotator cuff cannot be repaired. The Neer shoulder prosthesis is recommended for the relief of rheumatoid or osteoarthritic shoulder pain.