法医学杂志

法医学杂志 ›› 2011, Vol. 27 ›› Issue (4): 241-245.DOI: 10.3969/j.issn.1004-5619.2011.04.001

• 论著 •    下一篇

股骨有限元模型的建立及损伤生物力学验证

邹冬华1，李正东1，2，黄  平1，刘宁国1，陈忆九1   

  1. （1. 司法部司法鉴定科学技术研究所 上海市法医学重点实验室，上海200063； 2. 复旦大学 上海医学院法医学系，上海 200032）
  • 发布日期:2011-08-25 出版日期:2011-08-28
  • 通讯作者: 通信作者：陈忆九，男，研究员，博士研究生导师，主要从事法医病理学研究；E-mail：yijiuchen@yahoo.com.cn
  • 作者简介:邹冬华（1981—），男，上海人，助理研究员，主要从事法医病理学研究；E-mail：zoudonghua2008@yahoo.com.cn
  • 基金资助:

    国家自然科学基金资助项目（30872920、81072507）；上海市自然科学基金资助项目（10ZR1431200）；科技部科研院所社会公益研究专项（GY0906、GY1105）

Establishment of Femoral 3D Finite Element Model and Validation of Injury Biomechanics

ZOU DONG-HUA1, LI ZHENG-DONG1,2, HUANG PING1, LIU NING-GUO1, CHEN YI-JIU1   

  1. （1. Shanghai Key Laboratory of Forensic Medicine, Institute of Forensic Science, Ministry of Justice, P.R.China, Shanghai 200063, China; 2. Department of Forensic Medicine, Shanghai Medical College, Fudan University, Shanghai 200032, China）
  • Online:2011-08-25 Published:2011-08-28

被引次数

33

摘要： 目的 探讨利用Mimics软件将CT医学影像数据转化为有效的股骨有限元模型的可行性，为股骨骨折的生物力学研究提供模型基础。 方法 利用16排螺旋CT扫描股骨，将扫描结果以DICOM格式导入Mimics软件中，生成股骨三维模型，并对模型网格划分、材料赋值。在LS-DYNA软件中分别施加1 000 N的垂直载荷、进行三点弯曲试验及股骨侧面撞击分析，以验证模型的可行性。 结果 CT扫描共获得521张扫描图片，所建立的股骨三维有限元模型，共17 879个节点，106 834个四面体单元。垂直载荷下股骨颈各节点应力平均为（3.209 7±1.373 5） MPa，股骨三点弯曲试验中应变-挠度曲线与Kennedy试验结果一致，股骨侧面撞击有限元分析结果与法医学尸体解剖所见相符。 结论 本研究建立的模型适用于股骨生物力学碰撞研究。

关键词: 法医病理学, 生物力学, 有限元分析, 体层摄影术, 螺旋计算机, 股骨

Abstract: Objective To investigate the feasibility of creating an effective femoral finite element model from medical images of CT scan with Mimics software, and to provide a good model for femoral fracture biomechanics. Methods CT images of femur were obtained from 16-slice spiral CT, which were subsequently imported into Mimics software according to DICOM standard. The 3D femoral finite element model was developed, meshed and assigned with material properties. The feasibility of the model was tested and validated with LS-DYNA in different modes including vertical load of 1 000 N, 3-points bending and side impacts. Results Five hundred twenty-one scanning images were available and reconstructed to create a femoral finite element model consisting of 17 879 nodes and 106 834 tetrahedron elements. The average stress on the femoral neck nodes under vertical load was （3.209 7±1.373 5） MPa. Strain-deflection curve in 3-points bending test was consistent with Kennedy’s study results. The results of the side impact test were in accordance with the forensic anatomical findings. Conclusion The established model should be applicable to femoral collision biomechanics studies.

Key words: forensic pathology, biomechanics, finite element analysis, tomography, spiral computed, femur

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