Three-dimensional Finite Element Analysis Of The Influence On Biomechanics Of Meniscus After PCL Rupture

Objective:1. To reconstruct a finite element model of human knee containing posterior cruciate ligament and meniscus as well as other main structure and verify its validity;2. Using the verified finite element model of knee discuss the influence on biomechanics of meniscus after PCL rupture, ascertain the effect on the biomechanics of meniscus when PCL was rupture, to provide a theoretical basis for the reconstruction of PCL and prevent meniscal injury even osteoarthritis.Methods:1. Choose a normal adult male of knee after CT and MRI scanning to obtain the digital image date of bone and soft tissues, use the E-feature Biomedical Modeler to reconstruct a three-dimensional model of normal knee. Then define the boundary condition and material properties and import it into ANSYS finite element analysis software to verify its effectiveness;2. Set the loading condition, after load a1150N axial compressive force,134N posterior load and5Nm external rotation torque apply respectively in tibia, calculated and record the variation of peak stress and Von Mises stress distribution nephogram of normal knee and PCL-deficiency knee and compare the result.Results:1. The three-dimensional finite element model of human knee is constructed successfully and passed the validation and simulate the PCL completely rupture on the model;2. In response to the1150N axial compressive force in femur and posterior tibial load of134N, with PCL deficiency, the peak Von Mises stress of medial meniscus increase by19.79%, the lateral one increase by33.41%;3. With PCL deficiency, in response to the1150N axial compressive force in femur and5Nm external rotation torque in tibia, the peak Von Mises stress of medial meniscus increase by17.82%, the lateral one increase by30.21%。Conclusion:1. The three-dimensional finite element model of normal human knee which reconstructed by CT and MRI data as well as E-feature Biomedical Modeler software are real and reliable.2. There are bad influence on biomechanics of medial and lateral meniscus after PCL rupture, the stress concentration of lateral meniscus is more obvious when the posterior load and external rotation torque were applied in the three-dimensional finite element study.3. The chronic injury of meniscus may occur in PCL-deficiency knee, the risk of the lateral meniscus is higher, which prompt that PCL reconstruction implement early may prevent meniscus injury and deterioration.