The proper distribution of stress & a low rate of wear has become major concern in recent design consideration of total knee prosthesis. The TC IV knee system has kept the original anatomical design of the total condylar knee and improved and refined it. And it has some characteristics: deep patellar groove of the femoral component, 5 degree posterior tilted tibial UHMWPE articulating surface with increased potential range of motion, and beaded porous coating applied to the bone-component interface. This study reports the consecutive 61 arthroplasties in 42 patients. Follow up period was average three years and six months. There were 29 osteoarthritis, 29 rheumatoid arthritis, and three infection sequelae. In all cases, we used TC IV prosthesis, bone-cement for prosthesis fixation and sacrificed PCL. All patients were assessed using HSS knee score and American knee society clinical rating system, and roentgenographic evaluation and scoring system. 1. The range of motion was significantly increased from average 87.8 degrees preoperatively to average 122.9 degrees postoperatively. 2. The HSS knee score increased from average 47.7 points preoperatively to average 90.9 points postoperatively, and the functional score of AKS was average 85.6 and knee score was 93.4 postoperatively. 3. The flexion contracture was decreased from average 29.3 degrees preoperatively to average 3.9 degrees postoperatively. 4. In radiological review, the tibiofemoral angle changed from average varus 1.5 degrees preoperatively to average valgus 6.3 degrees postoperatively, and the joint line changed average 9.3mm preoperatively to average 13.7mm postoperatively, and nine knees(14%) had a radiolucency with a width of 2mm or more beneath one or two tibial zone. 5. Complications included two superficial infections and each case of transient peroneal palsy and patellar component wear in the metal backing type. 6. In summary, although the follow-up period was short, functional score of TC IV is no less than that of the other prosthesis with PCL retention.