Original articleOutcome of Copeland surface replacement shoulder arthroplasty
Section snippets
Materials and methods
Between 1996 and 2000, 56 consecutive Mark 3 Copeland humeral head surface replacement hemiarthroplasties were performed. All were included in this review. Six patients had died of other causes by the time of review, and two were lost to follow-up. This left 48 shoulders in 44 patients (4 bilateral). There were 32 female and 16 male shoulders. The mean age was 70 years (range, 34-84 years). Preoperative diagnoses are presented in Table I.
The indications for operation were primarily pain and
Results
The mean time between surgery and review for scoring in the research clinic was 34.2 months (range, 24-63 months). Nine shoulders were followed up for more than 4 years.
Constant scores for the whole group improved from a mean preoperative score of 16.4 (range, 8-36) to 54.0 (range, 20-83) at last follow-up (P < .05). Subgroup analysis according to diagnosis (rheumatoid arthritis or osteoarthritis) also yielded statistically significant differences. These data and figures for range of motion are
Discussion
We recognize potential sources of bias in the methodology of this study. Preoperative scoring was done by the same individual who went on to perform the operation. Nonetheless, measurement bias is more likely to occur during the postoperative assessment, which was performed by independent observers. Preoperative scores did not include an assessment of power; however, most patients would have scored 0 at this stage because they could not achieve the required 90° of shoulder abduction.3 Patients
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