Three-dimensional Reconstruction And Stress Analysis Of Knee Joint Based On CT Image

Knee joint as the body's largest and most complex joint in the ankle and hip,which is the hub of lower extremity,and its importance is self-evident.The disease on the knee attracts more and more people's attentions,the researchers at home and abroad also has more and more in-depth study on the knee.Knee anatomy and the corresponding biomechanical properties become the focus of researchers in recent years.The biomechanical environment of the knee joint have an important effect on the injuries of knee joint and arthritis of lesions,therefore,the biomechanical analysis of knee joint not only can help us understand the mechanism of knee trauma,but also can provide scientific guidance and plans for the diagnosis and rehabilitation after surgical.Recently,with exploring the biomechanical analysis of knee joint,many scientific researchers have proposed different static and dynamic model of the knee,but most of these models are only knee bone structure,not including the knee meniscus and cartilage structure,therefore,it's inaccurate to use these models to analyze the result of the knee joint's mechanical properties.The thesis is based on the physiological anatomy structure of knee joint and uses the two-dimensional CT image of the knee joint as the data source.Reconstructing the three-dimensional knee by using the image processing software Mimics and then using the finite element analysis software ANSYS Workbench to establish three-dimensional finite element model of knee joint.The thesis chooses the material property according to the experimental verified data to apply the loads and boundary to the whole model.The model simulates the force situation of the knee joint when a man stands still.And we will get the femoral cartilage,meniscus and tibia cartilage plateau stress distribution.The conclusion is:The medial of the knee joint bear the more weight than lateral,and more likely to resulting in the meniscus and cartilage degeneration,which will cause the knee joint disease.When the axis of the knee joint force inward,the articular surface decreases and the stress increase,which causes increase pressure on the unit area and is more obvious in medial,which is in accordance with the clinical data.