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  • Title: Hip arthroplasty for osteonecrosis in patients with systemic lupus erythematosus.
    Author: Chen YW, Chang JK, Huang KY, Lin GT, Lin SY, Huang CY.
    Journal: Kaohsiung J Med Sci; 1999 Dec; 15(12):697-703. PubMed ID: 10645131.
    Abstract:
    Thirty-seven hip arthroplasties including 19 bipolar hemiarthroplasties (BH) and 18 total hip arthroplasties (THA) were performed in our hospital in 23 patients with systemic lupus erythematosus (SLE) for femoral head osteonecrosis between July 1984 and July 1996. These patients were followed up retrospectively to compare the results of BH and THA. One case with right side BH and left side THA expired about 1 year after operation and was excluded from this study. In both groups, these hips with pre-operative osteonecrosis were subclassified in Ficat and Arlet classification. The mean duration of follow-up was 44.5 months (24-85 months) for THA was 70.2 months (24-119 months) for BH. The mean Harris scores pre-operatively were 56.7 +/- 1.09 points in the BH group and 50.7 +/- 1.29 points in the THA group. The mean post-operative scores were 81.9 +/- 4.37 points in the BH group and 95.5 +/- 0.80 points in the THA group at final follow up. The clinical results of the THA group were better than those of the BH group. However, at an early stage before collapse of the femoral head (Ficat stage II), the results of BH were as good as those of THA. Five BH were converted to THA at the time ranging from 39 months to 113 months (mean 63.2 months) after primary operation due to acetabular cartilage wearing or severe groin pain. The failure rate of BH group was 27.8% (5/18). There was no loosening or revision in the THA group. Although the follow-up durations were different in these two groups, the clinical result was obviously superior in the THA group, particularly after the femoral heads had collapsed. Considering the relatively short life span of SLE patients, we prefer THA over BH in the treatment of the femoral head osteonecrosis in SLE patients. However, based on our results, BH is still a very good choice of treatment before the collapse of the femoral head.
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