We examined the clinical and radiographic results of total knee arhtroplasties (TKAs). 22 TKAs were performed in 19 patients (15 females and 4 males) consisting of 13 cases of osteoarthritis and 6 cases of rheumatoid arthritis. The average age at the time of surgery was 63.0 years. The follow-up period averaged 6.3 years (range; 5 to 10 years). They were typed as follows: PCA modular (10 cases), Kinemax (1 case) and MG II (11 cases). The Japanese Orthopedic Association (JOA) score improved from a preoperative average of 59.5 points to the average at the mid term of 76.3 points. 1 knee required revision surgery due to the loosening of the femoral and tibial components after 7 years.