[Comparison of the results of PCA knee joint endoprosthesis in patients with rheumatoid arthritis and gonarthrosis].

Hundred and forty two porous-coated anatomic (PCA) total condylar arthroplasties were performed from 1985 to 1991 in hundred and twenty-four patients, ninety-seven women and twenty-seven men. The diagnosis was osteoarthritis in 96 cases and rheumatoid arthritis in 46 cases. The mean follow-up was 88 months, range from 51 to 137 months. All operated patients were evaluated based on survivorship of the endoprosthesis with the cumulative survivorship method according to Kaplan-Meier method. The end point was defined as endoprosthesis in situ. The overall cumulative survival rate for mean follow up time was 77%. The survival rate of the rheumatoid arthritis group was significantly higher (82.5%) than that of the osteoarthritis group (73.8%). 108 PCA arthroplastes were evaluated regarding Baltimore's score. The mean postoperative Baltimore's score was 68.7. In the rheumatoid arthritis group score was 74.8 and in the osteoarthritis group it was 65.9 but this difference is not statistically significant (p = 0.06).