Biomechanical Study Of Human Knee Joint Based On Motion Capture And Foot Pressure Test

Knee arthritis is a chronic disease in humans,and its incidence continues to increase with age.Therefore,studying the biomechanical characteristics of the knee joint is of great significance for the prevention and treatment of the disease.In this paper.Firstly,the motion capture system,and the plantar pressure test system to collect the gait data of the subj ect's walking,and analyzes the movement law of the human lower limb kinematics and dynamic parameters in a single gait cycle.Secondly,the finite model of the Knee joint is established,and numerical simulation about the force change in knee joint under standing conditions are completed,and draws some valuable conclusions.The main research contents of this paper are as follows:(1)Introduced knee osteoarthritis and its effects,introduced motion capture system and plantar pressure test system and their application research.The D-H five-link motion model was used to establish the kinematics model of the lower limb of the human body,and the reaction force of the ground was obtained by measuring the pressure of the plantar pressure to obtain the external force on the knee joint,and the mechanical model of the knee joint was completed;(2)An experimental scheme for gait data collection is proposed.Gait data was collected using VICON optical motion capture system and an AMTI foot pressure force plate.The results were processed and analyzed and the accuracy of the knee joint mechanical model was verified.Get knee force and moment through Opensim software;(3)The knee joint of the subject's left limb was measured with an MRI scan to measure the gait parameters,and the knee joint model was reconstructed using MIMICS software;the knee joint model was substantiated using Geomagic Studio software and Rhinoceros software to obtain a three-dimensional geometric model of the knee;(4)The HyperMesh mesh is used to obtain the knee joint finite element model.The ABAQUS 2016 software is used for finite element analysis.The quasi-static method is used to simulate representative moments in the gait,and then the str,ess changes of the knee internal structure are analyzed.It is found through research that:(1)during the gait cycle,at 50%of the time,the unilateral knee joint is subjected to the greatest stress,(2)during the gait cycleff the contact stress of the inner meniscus is always greater than that of the outer meniscus,and the contact stress of the inner edge of the meniscus is greater than the outer edge.This article combines theory with experimental tests,analyzes the laws of lower limb movement and knee force in a single gait cycle of human walking,and draws some valuable conclusions.The research results of this paper have certain reference significance for the prevention of knee joint diseases,sports injuries,knee joint rehabilitation,wear mechanism,and the design and manufacture of personalized knee joint prostheses.