抄録
Heterotopic ossification after total knee arthroplasty (TKA) is rarely seen. We performed uncemented TKA on 70 knees in 56 patients with osteoarthrosis and rheumatoid arthritis, and heterotopic ossification was observed in 4 knees of 4 cases. It began to form sometime between 2 months to 5 years postoperatively for 2-4 weeks and reached its peak at 6 weeks. The maximum diameter of the newly formed bones was 11-25mm, and the location was in the suprapatellar region in all cases. The possible etiology might be rasped bone dust from the anterior femur, or damaged surrounding soft tissue in the AMK-type operation, or severe preoperative malalignment in cases with rheumatoid arthritis. We have to carry out further examination of other factors to determine what caused flexion disturbance in 2 cases.
