Cementless Total Hip Arthroplasty Using VerSys Fiber Metal Midcoat Stem: a Minimum 3-Years Follow-up

ABSTRACT

PURPOSE: The purpose of this study was to retrospectively evaluate the results of cementless total hip arthroplasties that used a Versys fiber metal midcoat femoral stem. MATERIALS AND METHODS: From March 2000 to June 2005, 28 cases in 23 patients were followed up for a minimum of three years. The average follow up period was 5.1 years. Clinical results were evaluated by Harris hip scores. Radiographic analysis was done by evaluating fixation stability, osteolysis, stress shielding, and cortical hypertrophy. RESULTS: The mean Harris hip score improved from 43.1 to 93.8 at the last follow up. In radiographic analyses of the stem, there was no evidence of positional changes or vertical subsidence. There was heterotopic ossification in four, distal cortical hypertrophy in two, proximal stress shielding in twenty, and femoral osteolysis in five cases. The femoral stem revealed a stable bony ingrowth in all. The acetabular cup revealed a stable bony ingrowth in all. There was no evidence of horizontal or vertical migration or of a change of inclination angle of the acetabular cup. CONCLUSION: Cementless total hip arthroplasty using a Versys fiber metal midcoat femoral stem showed good clinical and radiologic results, but long term follow up is needed.