Abstract
From 1985 to 1990, the porous-coated anatomic (PCA) primary total knee system was employed at our hospital in Japan. Eighty TKAs with PCA primary were performed in 55 patients. Seventy-four joints in 50 patients were followed up for this study. The follow-up period was 6 to 11 years, and the follow-up rate was 91%. In both the RA and OA patients, the pain scores improved remarkably, and the scores for ambulation, contracture, deformity, and ADL increased, but the scores for ROM did not rise. Revision surgery was performed on six joints because of polyethylene wear in four and mechanical loosening in two. Definitive diagnosis of polyethylene wear was made by varus/valgus stress testing under fluoroscopy. Early diagnosis of polyethylene wear is important to prevent further severe damage to the knee joint.
