Cementless total hip arthroplasty with a close proximal fit and short tapered distal stem (third-generation) prosthesis

This study presents the results of a prospective, consecutive series of 50 patients (60 hips) who were observed for a minimum of 6 years after they had a primary total hip arthroplasty with a cementless Duraloc 100 series cup (DePuy, Warsaw, IN) with a close proximal fit and short tapered distal stem prosthesis (IPS hip; DePuy, Leeds, UK). There were 37 men and 13 women; the mean age was 46.6 years (range, 26 to 70 years). The mean follow-up was 6.3 years (range, 6 to 7 years). The mean preoperative Harris hip score was 42 points, which improved to 96 points at the final follow-up examination. The prevalence of transitory thigh pain was 2%. All hips had a satisfactory fit of the femoral stem in coronal (average, 88%) and sagittal (average, 94%) planes. There was no aseptic loosening or revision of the components. The wear rate per year was 0.23 mm. Four hips (7%) had osteolysis in the calcar femorale <1 cm in diameter. Although there was no aseptic loosening of the components, a low incidence of osteolysis, and a low incidence of thigh pain, a high rate of polyethylene liner wear in these young patients is a problem.