中国组织工程研究

中国组织工程研究 ›› 2011, Vol. 15 ›› Issue (22): 3997-4001.doi: 10.3969/j.issn.1673-8225.2011.22.003

• 数字化骨科 digital orthopedics • 上一篇    下一篇

坐位骨盆的三维有限元分析

高应超1，郭  征1，付  军1，田维军2   

  1. 1解放军第四军医大学西京医院全军骨科研究所，陕西省西安市  710032
    2西北工业大学机械工程系，陕西省西安市  710072
  • 收稿日期:2011-03-25 修回日期:2011-04-24 出版日期:2011-05-28 发布日期:2011-05-28
  • 通讯作者: 郭征，博士生导师，教授，解放军第四军医大学西京医院全军骨科研究所，陕西省西安市 710032 guozheng@fmmu.edu.cn
  • 作者简介:高应超★，男，1981年生，甘肃省张掖市人，汉族，解放军第四军医大学在读硕士，主要从事骨肿瘤及骨关节重建的研究。 jirui.999@163.com

Three-dimensional finite element analysis of the pelvis in sitting stance

Gao Ying-chao1, Guo Zheng1, Fu Jun1, Tian Wei-jun2   

  1. 1Institute of Orthopaedics, Xijing Hospital, the Fourth Military Medical University of Chinese PLA, Xi’an  710032, Shaanxi Province, China
    2Department of Mechanical Engineering, Northwestern Polytechnical University, Xi’an  710072, Shaanxi Province, China
  • Received:2011-03-25 Revised:2011-04-24 Online:2011-05-28 Published:2011-05-28
  • Contact: Guo Zheng, Doctor, Professor, Institute of Orthopaedics, Xijing Hospital, the Fourth Military Medical University of Chinese PLA, Xi’an 710032, Shaanxi Province, China guozheng@fmmu.edu.cn
  • About author:Gao Ying-chao★, Studying for master’s degree, Institute of Orthopaedics, Xijing Hospital, the Fourth Military Medical University of Chinese PLA, Xi’an 710032, Shaanxi Province, China jirui.999@163.com

PDF

440

被引次数

42

摘要：

背景：由于骨盆具有复杂的结构，目前对于坐位骨盆的生物力学研究较少，有限元法日益成为骨盆生物力学研究的重要手段。
目的：以有限元法研究成人正常静态坐位骨盆应力分布。
方法：获取正常成年女性全骨盆CT扫描图像，利用CT数据通过Mimics 10.0对图像数据进行重建，利用Geomagic，Proe5.0进行实体建模，输入ANSYS。再根据解剖部位建立骨盆主要韧带。对S1椎体上终板施加600 N静载荷模拟坐位时骨盆受力环境，计算该加载方式下骨盆的应力、应变及位移的分布情况。
结果与结论：垂直加载600 N载荷于骶骨上表面时重力由骶骨经骶髂关节向下传递，到达坐骨结节。此时的坐骨结节处承受较大压应力。有限元模型在静载荷下的特征部位应力、应变值基本能够反应骨盆特有的力学结构特性，模型的准确性较高。计算结果与文献中报道的结果相近，建立的人体全骨盆三维有限元模型较客观地反映人体骨盆的解剖结构和力学特性，可作为骨盆生物力学研究的工具及满足临床研究的需要。

关键词: 骨盆, 生物力学, 三维有限元法, 应力, 应变

Abstract:

BACKGROUND: As the the pelvis has complex structure, the studies of pelvis biomechanical properties are fewer in sitting stance. Finite element analysis is accepted gradually for biomechanics of the pelvis.
OBJECTIVE: To study the stress distribution on the pelvis of the adult in static sitting stance with three-dimensional finite element model.
METHODS: One healthy volunteer was scanned by multi-slices computerized tomography (MSCT). The three-dimensional images of the pelvis were reconstructed with the software Mimics 10.0. With the use of Geomagic and Proe5.0, the three-dimensional model of the pelvis was imported into the ANSYS10.0. Digital three-dimensional structures of the pelvic, such as ligament, were added to the three-dimensional model with powerful pre-processing modular of ANSYS. Finally, the integrated three-dimensional finite elemental model of the pelvis was established. The vertical load pressure (600 N) was exerted on the upper terminal plate of the first body of the sacrum to simulate sitting biomechanics. The stress, strain and displacement nephogram were obtained under axial load.
RESULTS AND CONCLUSION: The distribution of stress in bilateral iliac bones was equal. The stress passed through the ala of sacrum and the sacroiliac joint to the tuberodties of ischium. The highest stress was found at the tuberodties of ischium. The von Mises stress and strains for specific location could reflect the characteristic biomechanics of the pelvic ring, implying the accuracy of the finite element model. The results agreed with those by other biomechanics test. The established three-dimensional finite element model of normal adult is valid and reasonable. It can be used for biomechanical analysis and also can meet the needs of clinical situation.

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