Minimum 10-year results of a tapered cementless hip replacement

Seventy-one total hip arthroplasties with a cementless, wedge fit, cobalt c hrome femoral component were reviewed in 60 patients at a minimum 10-year f ollowup (mean, 11.5 years). For the femoral component, the mechanical failu re rate was 5% and the revision rate for aseptic loosening was 0%. The mean Charnley scores for pain, function, and motion changed from preoperative m ean values of 3.0, 2.7, and 3.2 to followup mean values of 5.7, 5.5, and 5. 2, respectively. The followup mean Harris hip Score was 91. The incidence o f thigh pain was 1.4% at 10-year followup. Ninety-five percent of femoral c omponents showed radiologic evidence of stable, bone ingrowth fixation, whe reas loosening was seen in 5% of stems. Despite the high incidence of aceta bular osteolysis, no osteolysis was seen on the femoral side distal to the lesser trochanter. Nonmodularity of the femoral component led to unavoidabl e revision of stably fixed femoral components in seven (9.8%) hips: during the revision of a loose socket. Design features (collarless, tapered, wedge fit, and circumferentially porous coated) were thought to be crucial to th e superlative results with the cobalt chrome femoral component.