BACKGROUND:As lumbar spine biomechanics research is unceasingly thorough and the constant development of related fusion and dynamic fixation device, the spine fusion technique which is represented by artificial disc replacement is a new choice to the spine surgeons. Therefore, it is particularly important to design reasonable artificial intervertebral disc. OBJECTIVE:To establish the finite element model of the new artificial disc replacement of the lumbar motion segment for further biomechanical study. METHODS:The L3-4 thin-section CT images of a healthy male volunteer was selected, combined with human anatomy data and applied the reverse engineering technology to rebuild the lumbar spine model with medical image software Mimics and tool software Geomagic Studio. The three-dimensional model of the silicone artificial disc was converted into a finite element model through software ANSYS12.0. RESULTS AND CONCLUSION:Through CT scanning, digital image processing and computer-aided design, the three-dimensional model of the lumbar motion segment and the finite element model of artificial disc replacement were successful y established. The finite element model contained 691 085 units and 1 008 913 nodes which could be applied constraint and load and could be used for spinal biomechanics and the further research of the new artificial intervertebral disc.% 背景：随着对腰椎生物力学研究的不断深入，相关非融合及动力内固定装置的不断完善和改进，以人工椎间盘置换为代表的脊柱非融合技术的出现给了脊柱外科医师新的选择，因此，设计合理的人工椎间盘显得尤为重要。目的：建立腰椎运动节段新型人工椎间盘置换的有限元模型，用于进一步的生物力学研究。方法：选取1名健康男性志愿者 L3-L4薄层 CT 扫描图像，结合人体解剖学数据，通过医学图像软件Mimics和工具软件 Geomagic Studio，应用逆向工程技术重建腰椎模型。结合硅胶人工椎间盘的三维模型，用有限元分析软件 ANSYS12.0转换成有限元模型。结果与结论：通过 CT 断层扫描、图像数字化处理及计算机辅助设计等方法，成功建立腰椎运动节段的三维模型和人工椎间盘置换的有限元模型。该有限元模型共有691085个单元，1008913个节点，可以施加约束和载荷，用于脊柱生物力学及新型人工椎间盘的进一步研究。
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