The Mechanism And Clinical Application Of Strong Non-linear Functional Movement Of Spine Structure

As an important component of the human bones,the spine plays a key mechanical role in maintaining the normal physiology of people,carrying on various loads,protecting the nerve system and maintaining various sports postures.The importance of the spine and the diversity and high incidence of spine disease,spine biomechanical research has been one of the hot spots of contemporary scholars.This paper studies the strong nonlinear functional motion of the spine structure,around the material and contact nonlinearity of the spine structure,and focused on the parameter optimization and model verification of the physical model of the spine structure under static / dynamic loads.The paper is divided into three parts:The first part is the initial establishment stage of Finite Element(FEM)model of spine.Based on CT scanning data,literature research and animal anatomy experiment,L4-L5 FEM model of lumbar spine was established.The stress and strain of the FEM model under the conditions of Flexion and Extension(FE),Axial Rotation(AR),Lateral Bending(LB)and Axial Stretching-compression(AS)are analyzed,and the key structure of the spine is obtained through sensitivity analysis.The second part is the optimization stage of the model.Firstly,the spine mechanical test is carried out to analyze the sensitivity of spine structural parameters under the conditions of FE,LB and AR.Then,the relevant parameters are adjusted and optimized according to the sensitivity analysis results,and the parameters with the smallest relative error of the system are selected as the final mechanical parameters.Finally,considering the compression stiffness of the model,the model is optimized and improved.The third part is the extension of the model and its preliminary clinical application.The FEM model of the whole lumbar L1-L5,sacrum,pelvis and public bone are established.The mechanical analysis when considering the spinal gravity,the simulation of intervertebral disc resection and the biomechanical analysis of the model with internal fixation system are carried out.