Stability, mobility, and freedom from pain are the requirements of a normal knee. Arthrodesis of a knee damaged by disease or injury will satisfy two of the three requirenents. The current status of knee replacement surgery suggests that high density polyethylene and chrome cobalt alloy or stainless steel are acceptable materials for use in the intra-articular environment of knee. These prosthetic components of artificial knees can be firmly cemented into bone and provide acceptable slinical results if used within their design limits. We have had 3 total knee replacements in the chronic rheumatoid patients. The results of 2 Geometric knee replacements and 1 Guepar knee replacement were assessed from 5 months to 2 years after operation. Total knee replacement improved mobility and reduced pain in these patients.