Biomechanics Of OA Knee Joint Based On Finite Element Method

Knee joint is an important sports joint of human lower limbs.When Osteoarthritis(OA)occurs in the knee joint,the pathological changes of bone structure and soft tissue change the load distribution mechanism in the joint.Recent progress in biomechanical studies of the knee joint shows that meniscus and articular cartilage have a reasonable load distribution mechanism under the normal knee joint.However,the biomechanical characteristics of OA at different stages are still unclear,and there are few studies on the establishment of anatomical models and finite element models of OA knee joint.In this paper,a threedimensional anatomical model was constructed by collecting image data of patients with bilateral OA knee joint,and the biomechanical characteristics of mild and severe OA knee joint were simulated based on the finite element method to explore the influence of meniscus subluxation on the development of OA..In this study,based on CT and MRI images of the knee,Mimics software was used to reconstruct three-dimensional anatomical models of bone and non-bone structures of the knee,including distal femur,proximal tibia,fibula,patella,meniscus,articular cartilage and main ligament,to visually represent the geometric changes of articular cartilage and meniscus at different OA stages.With knee vitamin capsules of the external fixation and bone structure of anatomy as a biomarker for registration of image sequence registration,registration process can be divided into the same registration and registration,use after registration in addition the fusion of image fusion,image sequence of multimodal image data sequence.After the fusion registration,a three-dimensional anatomical model with bone structure and non-bone structure was obtained.In Hypermesh were divided into mild OA knee and severe OA knee grid,and the models are necessary to simplify the process to reduce the cost,finite element analysis is imported in INP format of Abaqus software defined parameters such as material properties,boundary conditions,simulation of articular cartilage of the knee joint brief contact with standing and biomechanics of the meniscus,the finite element analysis results to the contact pressure and Mises stress with reference to the numeric data and analysis of meniscus subluxation quantity's influence on the load distribution.The finite element method was used to simulate the load distribution in the standing position of OA knee joint,and the damage to articular cartilage and meniscus during the dynamic motion of OA knee joint was predicted.Along with the degeneration of articular cartilage and meniscus,the loss of load distribution and lubrication mechanism in the joint would become the main factors causing joint space stenosis.Finite element simulation results show that the medial meniscus subluxation increase the load of the medial tibial cartilage,comparative and mild OA with severe OA knee off the muscle stress distribution and the contact pressure,the degree of the medial meniscus subluxation is associated with the distribution and the load of tibial cartilage,meniscus further increases the amount of dislocation on both sides of the slippage of the femoral muscle direction inward,increase patients with varus Angle,meniscal subluxation exacerbated the OA knee lower limb power line changes,this may be a remarkable feature in the process of the evolution of knee joint OA.