Plasma Spray Coated Ti Femoral Component for the Cementless Total Hip Arthroplasty
MS Park, JH Park, KH Yang, KB Seo
Department of Orthopaedic Surgery, College of Medicine, Chonbuk National University, and Institute of Medical Science, Chonju, Korea

A retrospective study of the clinical and radiographic results of the Mallory-Head total hip arthroplasties in 67 patients (76 hips) with a mean age of 50.1 years was undertaken. The mean follow-up period was 10.1 years (9-13years). Of the patients, excellent or good clinical results were found in 64 patients. Minimal thigh pain was found in 3 patients (4.4%). Seventy-one hips (93.4%) showed fixation by bony ingrowth and three (3.9%) showed the stable fibrous fixation. Bony on and ingrowth was also observed in 16 hips (21%) at distal smooth and of the grit-blast area. Two femoral components were revised (success rate 97.3%), one was for the subsidence, and the other was for the recurred infection. We suggested that these good results were caused by excellent bony ingrowth on proximal two-thirds of the femoral surface area. In conclusion, proximal of plasma-spray coating and tapered shape of Ti-stem showed excellent bony ingrowth and initial stability. Our results indicate that distal tapered shape will be an important element in the design of a cementless Ti stem.