Comparison of 1-mm Thickness Variance Polyethylene Insert Total Knee Arthroplasty System and 2-mm Thickness Variance Polyethylene Insert Total Knee Arthroplasty System in the Same Patients

Total knee arthroplasty(TKA) is a successful orthopedic surgery with excellent clinical outcome and survival. However, there are concerns about patient satisfaction in previous reports, and dissatisfaction rate of 15-30% is reported in clinical outcomes(PROMs) of some studies. Therefore, for improving the patient's outcome and satisfaction after total knee arthroplasty, it is necessary to change the design of the conventional total knee arthroplsaty implant. The knee is a joint structure with several dynamic functions, and not only the skeletal structure but also the soft tissue balance plays an important role in the function of the knee joint. New implants are being developed to overcome the limitations of conventional TKA implant, including the Exult total knee system (Exult; Corentec). Exult implant has 1mm thickness variance of polyethylene insert, which is different from the conventional total knee systems. This new total knee system has been shown in experimental studies to produce nearly normal knee movement.

The clinical results of this more specific variance of polyethyelen insert thickness total knee implant system are insufficient, and there is also a lack of comparative studies with conventional total knee arthroplasty implant. The purpose of this study is to compare outcomes between 1-mm thickness variance polyethylene insert total knee arthroplasty system(Exult, total knee system, Corentec) and conventional 2-mm thickness variance polyethylene insert total knee arthroplasty system(Lospa total knee system, Corentec) in the same patients. This study is a randomized controlled study in patients undergoing both knee total knee arthroplasty in a day. Radiologic parameter, patients preference and clinical results was investigated in both knee of same patients who received TKA during minimum 2 year follow up.