Effect of floor and chair sit-to-stand motions on determination of optimal surgical site for anterior cruciate ligament reconstruction surgery

There are insufficient studies on whether the shape of motion of the knee during anterior cruciate ligament reconstruction will affect the selection of the surgical site. The present study sought to identify the optimal surgical site for anterior cruciate ligament reconstruction by analyzing the biomechanical effects on the anterior cruciate ligament of both floor sit-to-stand and chair sit-to-stand motions. Human motion analysis and computed tomography were performed on four Korean males in their 20s without orthopedic disorders, and the von-Mises stress of the graft was calculated by performing computational analysis of two motions for each surgical site through multi-flexible body dynamics analysis. As a result, it was the smallest (floor sit-to-stand: 18.9±1.16 MPa, chair sit-to-stand: 17.9±1.2 MPa) at the proximal posterior 45° area with a radius of 15 mm from the lateral epicondyle in both motions. This study suggested that the type of motion does not affect the optimal surgical site during anterior cruciate ligament reconstruction surgery.