Effects of Posterior Cruciate Ligament Deficient on Biomechanics of Knee´s Principal Ligaments at Different Flexion Angles

To investigate the response of posterior cruciate ligament rupture on the biomechanics of other principal ligaments, the MRI images of normal human knee at various flexion angles(0°,25°,60° and 80°)were developed through SONATAMESTRO 1.5T and the intact and posterior cruciate ligament deficient knee models were built based on these images. Then three different loads were applied to these models for the finite element simulation to obtain the reaction force and stress state of the other three principal ligaments. The results show that:(1) ligaments´ tensions significantly changed at 0° and 60° flexion angles, and were more sensitive to flexion angles than load conditions; (2) a larger maximum von-Mises equivalent stress can be found at four flexion angles especially at 60°.