表面髋关节置换模型分为三维六面体单元165 886个，节点213 343个。
The model included 165 886 hexahedron elements and 213 343 nodes.
置换组是可兼容内容模型交换元素的机制。
Substitution groups are a mechanism for swapping elements of compatible content models with each other.
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，可以建立腰椎人工椎间盘置换的有限元模型，用于脊柱生物力学的进一步研究。
CONCLUSION: the finite element model of artificial disc replacement can be established by CT scanning, digital processor and computer aided design, and used for further study on spinal biomechanics.
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