Abstract
Anterior Cruciate Ligament (ACL) plays an important role in controlling tibial anterior translation and tibial internal rotation. But knee rotational instability does not improve after ACL Reconstruction (ACLR) for ACL Injury. Therefore, there is surgery to perform ACLR and Anterolateral Ligament Reconstruction (ALLR) at the same time. Anterolateral Ligament(ALL) controls tibial internal rotation. However, It has been reported that the reconstruction position of ALL affects tibial internal rotation. In this study, we first made a 3D knee joint model consisting of the femur, tibia, and fibula. Next, in the knee joint model which ALL, ACL, Posterior Cruciate Ligament (PCL), Lateral collateral ligament (LCL), and Medial collateral ligament (MCL) were attached, the effect of the attachment position of ALL on the internal rotation control function was evaluated by the finite element method (FEM). Using a 3D digitizer, we performed 3D scanning while rotating the right knee model by 20 °. The ligament model was made with a linear spring. When an anterior drawer force of 135 N was applied to the tibia, there was no difference in the tibial anterior translation amount with and without ALL. On the other hand, when an internal rotation torque of 5 N·m was applied, there was a difference in the tibial internal rotation amount with or without ALL.
