Midterm Results of Optetrak Posterior-Stabilized Total Knee System After 7 to 12 Years in a University Hospital

A clinical study has been carried out on 434 posterior-stabilized knee prostheses (Optetrak; Exactech, Gainesville, Fla) implanted between 1995 and 2000 in a university general hospital by 23 surgeons. At a mean follow-up of 8.8 years, 297 knees in 249 patients were available for review. Average patient age at surgery was 71.8 years. Average body mass index was 28.8 kg/m². Mean flexion range was 108° .The average knee score (Hospital for Special Surgery) increased from 48 points preoperatively to 86 points (60-97 points) at the final review. Of the patients, 81% had an excellent or good result, 14.9% had a fair result, and 4.1% had a poor result. Using the Kaplan-Meier method, we obtained a 91.3% predicted implant survival at 12 years including septic and aseptic revision in the best-case scenario.