中国组织工程研究

中国组织工程研究 ›› 2010, Vol. 14 ›› Issue (35): 6500-6503.doi: 10.3969/j.issn.1673-8225.2010.35.010

• 人工假体 artificial prosthesis • 上一篇    下一篇

组配式人工半骨盆假体重建后耻骨板断裂的非线性有限元分析

姬  涛，郭  卫，唐  顺，李大森   

  1. 北京大学人民医院骨与软组织肿瘤治疗中心，北京市  100044
  • 出版日期:2010-08-27 发布日期:2010-08-27
  • 通讯作者: 郭卫，博士，教授，主任医师，博士生导师，北京大学人民医院骨与软组织肿瘤治疗中心，北京市 100044 bonetumor@163.com
  • 作者简介:姬涛☆，男，黑龙江省哈尔滨市人，汉族，2009年北京大学医学部毕业，博士，主治医师，主要从事骨与软组织肿瘤临床与基础研究以及肿瘤型假体设计、生物力学研究。 sarcomasurgeon_cn@yahoo.com.cn

Nonlinear finite element analysis of the breakage in pubic connection plate after pelvic reconstruction with modular hemipelvic endoprosthesis

Ji Tao, Guo Wei, Tang Shun, Li Da-sen   

  1. Musculoskeletal Tumor Center, Peking University People’s Hospital, Beijing  100044, China
  • Online:2010-08-27 Published:2010-08-27
  • Contact: Guo Wei, Doctor, Professor, Chief physician, Doctoral supervisor, Musculoskeletal Tumor Center, Peking University People’s Hospital, Beijing 100044, China bonetumor@163.com
  • About author:Ji Tao☆, Doctor, Attending physician, Musculoskeletal Tumor Center, Peking University People’s Hospital, Beijing 100044, China sarcomasurgeon_cn@yahoo.com.cn

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347

被引次数

3

摘要：

背景：目前有限元法应用于骨科相关生物力学分析主要是静态载荷下的研究，评价系统应力峰值及全场应力分布情况。但由于疲劳计算和体内力学环境复杂，很难明确临床相关的生物力学问题。
目的：利用步行周期动态载荷分析组配式半骨盆假体重建髋臼缺损后耻骨板断裂的生物力学基础。
方法：通过骨盆环三维有限元模型模拟骨盆Ⅱ+Ⅲ区肿瘤切除后骨缺损，并通过CAD软件绘制的半骨盆假体模型进行重建。重建后的三维有限元模型通过Abaqus 6.7有限元分析软件分别计算重建骨盆在站立位及步行周期下耻骨板的应力分布情况，明确应力集中位置及耻骨板应力峰值。
结果与结论：有限元计算结果收敛，站立位时耻骨板应力峰值为3.5 MPa，应力集中点位于耻骨板近中点处；步行周期下耻骨板的应力峰值为273.0 MPa，应力集中点位于耻骨板与人工髋臼连接处，与临床观察到断裂的部位一致。提示组配式半骨盆假体耻骨板断裂的原因主要是由于步行周期载荷下耻骨板应力集中部位引起的高周疲劳断裂。

关键词: 半骨盆假体, 髋臼缺损, 耻骨板断裂, 有限元法, 疲劳断裂, 生物力学

Abstract:

BACKGROUND: Finite element method has been used in studies regarding orthopedics-related biomechanics under static loading, evaluation of stress peak and stress distribution. However, due to fatigue calculation and complex in vivo mechanical environment, clinic-related biomechanics is difficult to identify.
OBJECTIVE: To investigate the biomechanical basis of breakage of pubic connection plate after reconstruction of periacetabular defect by finite element method.
METHODS: The three-dimensional pelvic ring finite element model was reconstructed, and type Ⅱ+Ⅲ resection was simulated. The three-dimensional modular hemipelvic endoprosthesis was reconstructed with CAD software. Finite element model of the reconstructed pelvis was established. The stress distribution of the pubic connection plate was analyzed in simple standing and gait cycle. The position and value of peak stress was analyzed.
RESULTS AND CONCLUSION: The results of finite element analysis showed the peak von Mises stress was 3.5 MPa in the middle of the plate, and the peak stress during the gait cycle was 273.0 MPa located at the junction of plate and artificial acetabulum. The stress concentration position was the same as that of breakage during follow-up. The reason for breakage of the pubic connection plate was attributed to the fatigue fracture during high cycle of gait load.

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