Total knee arthroplasty with an oxidised zirconium femoral component: a 5-year follow-up study.

Purpose: To report the early results of the Oxinium Genesis II prosthesis with an oxidised zirconium femoral component in 55 patients.

Methods: 71 knees in 21 men and 34 women aged 32 to 75 (mean, 55) years were evaluated; 16 of the patients had bilateral staged total knee replacements with a mean interval of 9 (range, 6-16) months between surgeries. The indications for surgery included osteoarthritis (n=57), rheumatoid arthritis (n=13) and revision from a unicompartmental knee replacement for osteoarthritis (n=1). Postoperatively, patients were evaluated using the Knee Society score (KSS), the modified Oxford Knee Score, and the SF-12 health survey, as were component position, leg and knee alignment, and prosthesis-bone interface or fixation on radiographs.

Results: The mean follow-up was 62 (range, 51-88) months. The mean KSS, Oxford Knee Score, and SF-12 physical component score improved significantly. Radiolucent lines (<2 mm) were noted in the tibial cement-bone interface in 17 knees (most commonly in zones 4 and 1) and in the femoral cement-bone interface in one knee. The alignment of the knees and positioning of the components were acceptable. There were no revisions for septic or aseptic loosening.

Conclusion: Early results of the Oxinium Genesis II prosthesis are comparable to the standard total knee prostheses.