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In this study we modeled a patient specific 3D knee after anterior cruicate  ligament (ACL) reconstruction. The purpose of the ACL reconstruction is to  achieve stability in the entire range of motion of the knee and the  establishment of the normal gait pattern. We present a new reconstruction  technique that generates patient-specific 3D knee models from patient’s  magnetic resonant images (MRIs). The motion of the ACL reconstruction  patients is measured by OptiTrack system with six infrared cameras. Finite  element model of bones, cartilage and meniscus is used for determination  stress and strain distribution at different body postures during gait  analysis. It was observed that the maximum effective von Mises stress  distribution up to 8 MPa occurred during 30% of the gait cycle on the  meniscus. The biomechanical model of the knee joint during gait analysis can  provide insight into the underlying mechanisms of knee function after ACL  reconstruction. [Projekat Ministarstva nauke Republike Srbije, br. III-41007,  i br. OI-174028]

Biomechanical modeling of knee for specific patients with chronic anterior cruciate ligament injury