经伤椎短节段内固定治疗骨质疏松性胸腰椎骨折的三维有限元分析

Three-dimensional Finite Element Analysis of Short-segment Internal Fixation with Screw of Fractured Vertebra for Osteoporotic Thoracolumbar Fractures

本文在CT扫描数据的基础上通过逆向建模构建人体脊柱T11-L3椎段三维几何模型,去除L1椎体下部的骨质模拟爆裂性骨折,然后建立经伤椎短节段内固定有限元模型,赋予各个组织材料属性,在模型上施加不同的载荷模拟人体胸腰椎前屈、后伸、左侧弯、右侧弯、左轴向旋转、右轴向旋转六种生理运动状态。通过有限元仿真计算经伤椎短节段内固定方式治疗骨质疏松性胸腰椎骨折时,椎体活动度(range of motion,ROM)以及内固定系统的应力。

On the basis of CT scan data,the three-dimensional geometric model of human spine T11-L3 vertebra is constructed by reverse modeling,the burst fracture is simulated by removing the bone in the lower part of L1 vertebra,a nd then the finite element model of the short-segment internal fixation model with screw of fractured vertebra is established,and the properties of each tissue were given to the model.Six movements(flexion,extension,left bending,right bending,left axial rotation,right axial rotation)were simulated by applying different loads to the model.The range of motion(ROM)of segments and the stress of the internal fixation system in the treatment of osteoporotic thoracolumbar fractures with short-segment internal fixation with screw of fractured vertebra were calculated by finite element simulation.