Primary uncemented Osteonics total hip arthroplasty: preliminary results of 2-6 year follow-up.

BACKGROUND: Cemented total hip arthroplasty (THA) bears the inherent disadvantages of cement complications. A research toward the improvement of uncemented prosthesis design continues to evolve. The purpose of this report is to present the preliminary results and to identify common problems in uncemented THA. METHODS: The results of 402 primary Osteonics total hip prostheses were reviewed with an average follow-up period of 3.1 years. The postoperative rating according to the modified D' Aubigne & Postel hip score included functional and radiographic analysis. RESULTS: The results were rated as good or excellent in 95% of hips. Stable fixation of the prosthesis was shown in 97% of radiographs. The most common zone of focal osteolysis was in the periarticular area. CONCLUSION: The clinical results in a 2 to 6 year follow-up was encouraging. A relatively high incidence of thigh pain did not correlate with femoral canal filling of prosthesis. Periarticular osteolysis is still an unsettled problem in uncemented prostheses and needs further investigation.