objective:Three dimensional digital modeling of human knee joint is carried out, and the
mechanical behavior of knee joint in landing impact motion is analyzed by finite element method, which
provides a reasonable basis for prevention of knee joint sports injury.Methods: three dimensional
geometric model of knee joint was reconstructed by software Mimics;Transforming 3D geometric model
into 3D finite element model by 3-matic software;The finite element software ANSYS was used to
analyze the stress and strain of the cruciate ligament, tibial cartilage and meniscus in different impact
motions.Results and conclusion:1. jumping and landing impact moment, knee cartilage, ligament,
meniscus stress increases with the increase of the height of jumping, the tibia, the average distribution of
the lateral platform landing impact load, the stress is greater than the anterior cruciate ligament posterior
cruciate ligament, jumping height is 66cm, should be the force of posterior cruciate ligament in very close
to the maximum, suggesting jumping height greater than 66cm in normal life or race training is easy to
damage the posterior cruciate ligament.2, the posterior cruciate ligament with limited internal rotation of
the femur in knee function, under the situation that internal rotation of the femur or tibia external rotation
may damage the posterior cruciate ligament.