INFLUENCE OF THE INTRA-OPERATIVE FEMOROTIBIAL ANTEROPOSTERIOR CHANGES ON POST-OPERATIVE MAXIMUM FLEXION ANGLES IN NAVIGATED CRUCIATE-RETAINING TKA

IntroductionRange of motion (ROM) is one of the important factor for better functional outcome after total knee arthroplasty (TKA). In posterior cruciate ligament (PCL) retaining (CR) TKA, adequate PCL function is suggested to be important for better kinematics and ROM. However, intraoperative assessment of PCL function is relatively subjective, thus more objective evaluation is required to improve the functional outcomes after TKA. In clinical practice, tibial posterior sagging sign is well known to indicate PCL deficiency. Hence, we hypothesized that intraoperative femorotibial antero-posterior (AP) changes at 90° of flexion indirectly reflected the PCL function and associated with postoperative maximum flexion angles in CR TKA. The purpose of this study was to investigate the correlation between intraoperative femorotibial AP changes at 90° of flexion and postoperative maximum flexion range in navigated CR TKA.MethodsBetween March 2014 and March 2015, forty patients with varus osteoarthritis underwent ...