1.上海交通大学 机械与动力工程学院;2.宁夏大学 机械工程学院;3.东方医院 创伤骨科
目的 建立T2-L5胸腰椎有限元模型并验证其有效性，为探究脊柱冲击载荷下的动态响应特性及损伤机理提供数值模型支撑。 方法 基于CT断层扫描图像数据建立T2-L5胸腰椎三维有限元模型；仿真分析施加不同力矩下（屈伸、旋转和侧弯工况）T12-L1段载荷-转角曲线并与文献报道的数据进行对比，对T2-T6、T7-T11和T12-L5三段脊柱有限元模型施加不同高度下的自由落体载荷并进行仿真分析，获得轴向力峰值和弯矩并与文献报道的数据进行对比分析。 结果 T12-L1段脊柱有限元模型受不同方向力矩发生最大转角在-2.24°~1.55°，与文献数据吻合良好。在不同跌落高度下，T2-T6、T7-T11和T12-L5三段脊柱有限元模型的轴向峰值力分别为1.7 kN~5.3 kN、1.3 kN~5.5 kN和1.3 kN~7.5 kN，均处于文献数据误差范围内；脊柱与椎间盘应力云图显示，椎体由外缘最先受力，椎间盘由髓核承受主要载荷，符合实际脊柱损伤发生机制。 结论 本文所建立的T2-L5脊柱模型能够正确模拟不同工况下脊柱的生物力学行为特性，分析结果是有效性的。
Objective A finite element model of T2-L5 thoracolumbar spine was established. The model was validated under various load conditions to provide model support for exploring the dynamic response characteristics and injury mechanism under spinal impact load. Methods A three-dimensional finite element model of T2-L5 thoracolumbar spine was established based on CT scan data. The load-rotation angle curve of T12-L1 segment under different moments (flexion and extension, rotation and lateral bending conditions) was calculated and compared with the data reported in the literatures. The free-fall load at different heights was applied to the finite element models of T2-T6, T7-T11 and T12-L5 spine. The peak axial force and bending moment were obtained by finite element simulation analysis and compared with the data reported in the literatures. Results The maximum rotation angle of T12-L1 finite element model was -2.24 ° ~ 1.55 ° under different direction moments, which was in good agreement with the literature data. The peak axial force of three segments of spine finite element models T2-T6, T7-T11 and T12-L5 subjected to different free-fall load was 1.7 kN~5.3 kN, 1.3 kN~5.5 kN and 1.3 kN~7.5 kN respectively, which were within the range of literature data errors; the spine and intervertebral disc stress clouds showed that the vertebral body was first stressed from the outer edge, and the intervertebral disc was subjected to the main load by the nucleus pulposus, which was in line with the actual spinal injury mechanism. Conclusion The T2-L5 spine model established in this paper can correctly simulate the biomechanical behavior characteristics of the spine under different operating conditions, and the analysis results are effective.