Abstract In order to accurately analyze the most vulnerable fracture points of normal human lumbar vertebrae under upright position, walking and left-right rotation, the spiral computer tomography (CT) was used to scan the segment from the upper edge of lumbar vertebra L1 to the lower edge of lumbar vertebra L5. After reading CT images with Mimics software, the threshold analysis, area segmentation and the whole filling were carried out. The generated 3D geometric model was reconstructed using the Finite Element Analysis (FEA) module of Mimics, and the 3D lumbar model with intervertebral disc established by UG software was used. The model was imported into ANSYS Workbench for finite element analysis. The results showed that when the human body was upright, the displacement of the vertebral body was larger than that of the articular process. The displacement of the leading edge of the upper surface of the disc was the largest and equal to 0.161 mm. The equivalent stress is concentrated on the articular process and spinous process, and the stress on the lower articular process of the L4 is the largest (15.073 MPa) indicating that the relative error between the finite element analysis result and the theoretical calculation result is small. Hence, it proves that the method is correct and feasible.

中文翻译：

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基于CT图像和有限元分析的人体腰椎反演模型

摘要 为了准确分析正常人腰椎在直立位、行走和左右旋转下最易受损伤的骨折点，采用螺旋计算机断层扫描（CT）扫描腰椎L1上缘至腰椎椎体。腰椎 L5 下缘。用Mimics软件读取CT图像后，进行阈值分析、区域分割和整体填充。生成的3D几何模型使用Mimics的有限元分析（FEA）模块重建，使用UG软件建立的3D椎间盘腰椎模型。该模型被导入到 ANSYS Workbench 中进行有限元分析。结果表明，人体直立时，椎体的位移大于关节突的位移。圆盘上表面前缘位移最大，为0.161mm。等效应力集中在关节突和棘突上，L4下关节突的应力最大（15.073 MPa），说明有限元分析结果与理论计算结果的相对误差较小。因此，证明该方法是正确可行的。