Follow up Study of Okayama Knee Prosthesis (Mark II)

The results of 38 kness in 31 patients treated by Okayama knee prosthesis (Mark II) were evaluated by clinical and radiological findings and compared with 41 knees (Miller/Galante). An average age was 66.4 years old and the mean of follow-up period was 4.5 years. These were 19 knees in 17 patients with OA and 19 knees in 17 patients with RA.Using the criteria described by three universities, clinical score after surgery was 71.7 points gained by Mark II and 77.6 poins by M/G.Radiologically, an average femoro-tibial angle was 176.2° in the former and 174.0° in the latter.As a whole, there was no difference between the two clinically, but the range of motion obtained and the angle of positioning of the femoral and tibial components radiologically were different fairly between them. We discussed these ploblems.