The Flexion Contracture Of The Knee Correlates With Posterior Offset Ratio After Total Knee Arthroplasty

Introduction: Improving the postoperative knee motion in total knee arthroplasty (TKA) has become a major goal for orthopaedic surgeons and joint prosthesis. The effect of the implant posterior condylar offset has recently generated much enthusiasm among researchers. [1] Some reports were concerned about the relationship between the posterior condylar offset and an extension gap. However, the posterior condylar offset was measured in a flexed knee position or in reference to femoral anatomy alone.[2-4] We have previously reported that posterior femoral condylar offset relative to the posterior wall of the tibia (posterior offset ratio; POR) is possibly the risk of knee flexion contracture associated with posterior femoral condylar offset after TKA. [5] However, there are no reports concerning the relationship between POR and flexion contracture of the knee in vivo. The aim of this study is to evaluate the relationship between the measurement of POR and flexion contracture of the knee in vivo.