Long-Term Results of Total Hip Arthroplasty using a Cemented M$\“{u}$ller Prosthesis

Purpose : The purpose of this study was to evaluate the long-term results of cemented Muller prostheses using a 32 mm metal femoral head. Materials and Methods : We reviewed 43 (31 patients) of 76 (55 patients) consecutive THAs, which were performed between April 1978 and September 1985. The average duration of follow-up was 148 months (range, 65-279 months). The average age at the time of index operation was 44.4 years. Preoperative diagnosis was osteonecrosis in 31 hips, posttraumatic osteonecrosis in 8 hips, osteoarthritis in 2 hips, and rheumatoid arthritis in 2 hips. We assessed cases clinically by Harris hip scores and radiographically by loosening and osteolysis, and measured polyethylene wear by the Livermore method. Kaplan-Meier analysis was used to evaluate survivability. We analyzed the relationship and the statistical difference between wear and age, weight, height, body mass index, diagnosis, polyethylene thickness, and cup inclination (Pearson correlation's analysis, Student t-test, ANOVA test). The p-value was set p/yr respectively, and a 10-year cumulative survival rate was 72% (67-80%, 95% confidence interval). Revision surgery was performed in 27 hips (63%) and the mean time from index operation to revision was 129 months. The linear and volumetric wear rates increase significantly as body mass index increased (p or > ) (p