変形性膝関節症におけるProfix型人工膝関節置換術の中期成績
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Between September 1995 and March 1998, mid-term results of 66 knees in 55 patients with osteoarthritis treated by Profix (Smith and Nephew, Inc, Memphis, TN) total knee arthroplasty were evaluated clinically and radiologically. All cases were cementless femurs and tibial components were implanted. The average age was 74.1 years (range; 60 to 89 years) at the time of surgery. The follow-up period was an average of 5 years and 10 months (range; 5 to 7 years).The mean JOA knee rating score improved from 46.4 to 73.7 points. The mean extension was —12.2° preoperatively and increased to a mean of —2.3°. The mean FTA improved from 186° to 171° postoperatively. The mean flexion went from 117.5° preoperatively to a mean of 101.5° postoperatively. The mean FTA improved from 186° to 171° postoperatively.There was no loosening or sinking radiographically. On the tibial side, radiolucent lines were noted in 15 knees (22.7%). On the femoral side, radiolucent lines were noted in 7 knees (10.7%). There were no radiolucent lines of more than 2mm in thickness.There was no statistically significant correlation between the occurrence of radiolucent lines and postoperative clinical resuits. Considering loosening and infection, survival rate was 0 %.The Profix system provided excellent and predictable mid-term clinical results in the current series of patients. Total knee arthroplasty with cementless technique was a reliable and effective means of treating osteoarthritis.
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