The results of fifty-three unconstrained (Neer-II or Gristina) total
shoulder arthroplasties were reviewed with the use of survivorship
analysis. Failure was defined as the need for revision or the onset of the
patient's dissatisfaction. The method of survivorship analysis is presented
in detail. Fifty-one total shoulder arthroplasties were followed for a
minimum of two years (average, sixty-seven months). The results are
reported with the use of the American Shoulder and Elbow Surgeons' rating
form. After eleven years, the survivorship was 73 per cent for all
prostheses, 71 per cent for the Neer prostheses, and 92 per cent for all
prostheses in patients who had rheumatoid arthritis. Data on survivorship
of the Gristina prosthesis were available after four years only, at which
time it was 100 per cent. The relief of pain, which was the primary reason
for the operation, was good or excellent in 82 per cent, improved in 6 per
cent, and poor in 12 per cent of the shoulders in these patients.