Abstract
Nine total knee arthroplasties (TKAs) were performed on deformed knees with bone defects in 7 patients. Deformities were as follows: three valgus deformities, four varus deformities, one flexion contracture deformity and one subluxation. Posterior stabilizing (PS) type implants with long stems were used. Bone defects were filled with metal spacers in 6 knees, a metal spacer and thicker insert in 1 joint, bone graft in 1 knee, and bone graft and metal spacer in 1 joint. Arc of motion and JOA knee scores were improved in 8 knees. Deformity reappeared in two patients. Valgus with recurvatum deformity reappeared in one rheumatoid patient who had had severe valgus knee deformity preoperatively and the other joints had fixed deformities in the ipsilateral lower leg. In another patient who had severe varus knee deformity after purulent gonoarthritis, varus with recurvatum deformity reappeared. If a PS knee implant is used for a patient with severe preoperative deformity, and the deformity recurs, use of a constrained type implant may be better for such a case.
