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


CONCLUSIONS
Early results of the Oxinium Genesis II prosthesis are comparable to the standard total knee prostheses.
Department of Trauma and Orthopaedic Surgery, Barnet and Chase Farm Hospitals, Barnet, Hertfordshire, United Kingdom.
Derek H
DH
Park
North East Thames (University College London Hospital) Rotation, United Kingdom.
Julian
J
Leong
Department of Trauma and Orthopaedic Surgery, Broomfield Hospital, Chelmsford, Essex, United Kingdom.
Stephen J
SJ
Palmer
D000328:Adult; D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D005269:Femur / Q000601:surgery*; D005500:Follow-Up Studies; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D011474:Prosthesis Design; D011859:Radiography; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D013997:Time Factors; D016896:Treatment Outcome; D015040:Zirconium
D015040:Zirconium; C028541:zirconium oxide
arthroplasty, replacement, knee; zirconium
oxide