Introduction: We reviewed clinical results of the performance of FNK-type total knee arthroplasties (TKAs) for treatment of rheumatoid arthritis (RA) knees.

Materials and Methods: Materials we had studied were 372 knee joints in 202 cases (21.1%) with RA (36 joints in 22 male patients, and 336 joints in 180 female) out of 1762 knee joints in 1032 cases who had undergone TKA using FNK type prostheses between May 1995 and December 2003. A mean age of patients at index procedures was 62.4 years (24 – 74 years), with a mean follow-up period of 6.7 years (1 – 9.4 years). With these cases, we discussed clinical evaluation on the basis of JOC rating scores, postoperative range of motion, complications, and others.

Results: 288 knee joints (77.4%) in 144 patients were involved in bilateral simultaneous TKA. The range of motion (ROM) had shown a significant improvement from a preoperative average of 15.2 – 110.2° to 2.3 – 125.0° at the last follow-up. There have been no cases of revision surgery at all, with excellent postoperative results.