Cementless Total Hip Arthroplasty Using the Conical Femoral Stem / 대한정형외과학회잡지

ABSTRACT

PURPOSE: The purpose of this study is to evaluate the clinical and radiological results of cementless total hip arthroplasty using a conical stem. MATERIALS AND METHODS: From June 2005 to December 2007, total hip arthroplasty using the conical stem was performed in 47 patients and 51 hips. The most common causes for total hip arthroplaty were osteonecrosis of the femoral head in 32 cases. The mean follow-up period was 74.3 months (range 62-93 months) and the mean age was 51.2 years (range 36-84 years). The clinical evaluation included the Harris hip score, the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score, and pain on the inguinal area or thigh. Radiographic evaluation was performed for determination of the fixation status of the implant, the radiolucent line, subsidence, loosening and heterotopic ossification around the acetabular cup and the femoral stem. RESULTS: At the most recent follow-up, the mean Harris hip score was 94.1 points and the WOMAC score was 11.3 points. Radiologically, bone ongrowth was seen in all cases without migration of acetabular cup, femoral stem, changing of the position, subsidence and loosening. Complications included two cases of posterior dislocation, one case of heterotopic ossification, and one case of deep vein thrombosis. CONCLUSION: Cementless total hip arthroplasty using the conical femoral stem shows good clinical and radiologic results in treatment of osteonecrosis of the femoral head with normal canal flare index and femur neck fracture with stove pipe type.