A ten-year follow-up of one hundred consecutive müller curved-stem total hip replacement arthroplasties

Abstract

This study involved review of 100 Muller curved stem total hip arthroplasties (THAfs) at 10 years following surgery. Twenty patients with 22 THAfs had died and 25 THA'fs had been revised for various reasons. This left 53 THA'fs for analysis and of these 35 were good or excellent with Harris hip scores.80 while 18 were classifi ed as poor or fair with Harris hip score <80. Ten-year follow up radiographs were performed in 47 hips showing migration in 23 % of acetabular components and 28 % of femoral components. There was a 15 % incidence of bone resorption in the proximal end of the femur without migration and a 4 % incidence of osteolytic defects about the femoral component without migration Combining both the clinically loose (revised) implants with the radiographically loose replacements (migration) this study found that aseptic loosening occurred in 29 % of acetabular components and 40 % of femoral components. Acetabular component loosening was more likely to occur in the elderly while femoral component loosening was more likely to occur in males, younger age, heavy weight and unilateral disease. Loosening of the femoral component occurred earlier after surgery whilst acetabular component loosening increased with time after surgery.