A statistical evaluation of geometric total knee arthroplasties.

Seventy-five knees in 56 patients were examined preoperatively and at two years after geometric total knee surgery. Thirty-three knees were in 28 patients with osteoarthritis. Fourty-two knees were in 28 patients with rheumatoid arthritis. Pain was significantly decreased and the use of aids was significantly decreased in both groups. The distance walked increased significantly for the osteoarthritic group but not for the rheumatoid group. Rheumatoid patients did not fare as well as osteoarthritic patients in distance walked and use of aids. Knees with osteoarthritis had more evidence of lucent lines and implant loosening than did the rheumatoid patients.