Evaluation of Hylamer-zirconia hip arthroplasty in patients less than 50 years of age.

The purpose of this prospective study was to determine the clinical outcomes of patients who had total hip arthroplasties with a zirconia (Zr) - Hylamer pairing. Fifty-eight consecutive cemented total hip arthroplasties with a Hylamer cup and 22.25 mm Zr head were examined for component wear and failure. The SF-36 and Mayo hip score were used to evaluate patient outcome. Regression and Kaplan Meier survival analyses were used to determine outcome. The mean Mayo postoperative score was 94 points. The median post-operative SF-36 score was 84 points. The mean rate of wear was 0.097 +/- 0.02 mm/year, with no evidence of loosening or significant osteolysis at a minimum follow-up of 5 years. Kaplan-Meier survival analysis was 98% at 3-year follow-up and 94% at 5-year follow-up. This study has confounded previous reports relating to Zirconia-Hylamer counter-surface components.