应用生物力学模拟腰椎突出症椎间盘受力分布的有限元分析

A finite element analysis using biomechanics to simulate the force distribution of intervertebral discs in lumbar spondylosis

目的 运用有限元分析腰椎突出的椎间盘的生物力学效应,分析其受力特性。方法 选择一名中老年男性椎间盘突出志愿者,根据其CT扫描结果构建全腰椎(L4~S1)三维有限元模型,在L4上表面施加朝下的500N力以及前后、左右以及平面旋转的10N·m的扭矩,分析邻近节段的活动度(Range Of Motion,ROM)、椎间盘变形量和应力变化情况。结果 此研究建立了腰椎突出症椎间盘受力的有限元模型,和相关文献数据比较,模型在L5~S1节段的ROM,比参考模型分别下降41.6%~54.9%,12.9%~33.7%,前屈处变形量和应力均为最大,后伸处变形量和应力最小,前屈活动度受限最为明显。结论 应用三维有限元技术模拟了腰椎突出症椎间盘受力分布的情况,并根据计算结果分析不同角度的受力特性,为临床诊疗提供了相应参考。

Objective To use finite element to analyze the biomechanical effects of lumbar herniated intervertebral discs and analyze their stress characteristics.Methods A middle-aged and elderly male volunteer with intervertebral disc herniation was selected,and a three-dimensional finite element model of the whole lumbar spine(L4 ~ S1) was constructed based on the CT scan results.A downward force of 500N and a front-to-back,left-right,and plane rotation of 10N were applied to the upper surface of L4.m torque,calculate its deformation and stress distribution changes.Results Compared with the relevant literature data,the ROM of the model in the L5 ~ S1 segment decreased by 41.6% ~54.9% and 12.9% ~33.7%,respectively,and the deformation and stress were the largest in forward flexion,the lowest in posterior extension,and the limitation of forward flexion range of motion was the most obvious.Conclusion The three-dimensional finite element technology was used to successfully simulate the force distribution of the intervertebral disc in lumbar spondylosis,and the analysis and discussion were conducted to provide corresponding reference for clinical diagnosis and treatment.