中国组织工程研究

中国组织工程研究 ›› 2011, Vol. 15 ›› Issue (35): 6546-6550.doi: 10.3969/j.issn.1673-8225.2011.35.020

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

正常髋部与佩戴保护支具髋部的有限元对比分析

何剑颖，董谢平   

  1. 江西省人民医院骨二科，江西省南昌市  330006
  • 收稿日期:2011-03-22 修回日期:2011-05-13 出版日期:2011-08-27 发布日期:2011-08-27
  • 通讯作者: 董谢平，主任医师，硕士生导师，江西省人民医院骨二科，江西省南昌市 330006
  • 作者简介:何剑颖★，男，1980年生，江西省上饶市人，汉族，2006年南昌大学毕业，硕士，主治医师，主要从事脊柱、关节的研究。
  • 基金资助:

    国家“十一五”科技支撑项目(2008BAI68B06)。

Normal hips and the hips covered with protective brace：A finite-element comparative analysis

He Jian-ying, Dong Xie-ping   

  1. Second Department of Orthopedics, Jiangxi People’s Hospital, Nanchang  330006, Jiangxi Province, China
  • Received:2011-03-22 Revised:2011-05-13 Online:2011-08-27 Published:2011-08-27
  • Contact: Dong Xie-ping, Chief physician, Master’s supervisor, Second Department of Orthopedics, Jiangxi People’s Hospital, Nanchang 330006, Jiangxi Province, China dongxieping@medmail.com.cn
  • About author:He Jian-ying★, Master, Attending physician, Second Department of Orthopedics, Jiangxi People’s Hospital, Nanchang 330006, Jiangxi Province, China hejianying1980@sohu.com
  • Supported by:

    the National Key Technology Research & Development Program of China during the Eleventh Five-year Period, No. 2008BAI68B06*

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被引次数

1

摘要：

背景：有限元法因其具有不受样本量限制，实验误差小，重复性好等优点而成为防滑倒生物力学研究的重要手段。
目的：建立正常骨盆以及佩戴护具骨盆的三维有限元模型，分析滑倒过程中骨盆各部位的应力、应变和位移分布，验证护具的有效性。
方法：以中国数字人原始资料应用Abaqus 6.51软件构建正常骨盆以及佩戴护具骨盆的三维有限元模型，固定约束地面刚体，对整个骨盆模型加载2 m/s的速度载荷，程序运算后观测骨盆模型佩戴护具前后的应力、应变及位移随时间的变化规律和分布云图。
结果与结论：与未佩戴护具比较，佩戴护具时滑倒过程中骨盆与地面的接触力、骨盆与地面产生最大接触力时松质骨最大压缩应变、大转子以及股骨颈周围应变最大值、大转子和股骨颈附近的最大von-Mises应力值、大转子和股骨颈处的平均应力值等均明显减小。提示髋部保护支具对大转子具有保护作用，能有效降低人体滑倒时转子间骨折的发生率。

关键词: 骨盆, 有限元分析, 生物力学, 髋部护具, 滑倒

Abstract:

BACKGROUND: Finite element method has become an important means for biomechanical study against sideways falls because of its unlimited sample size, small experimental error and good repeatability.
OBJECTIVE: To establish three-dimensional normal pelvis and brace-covered pelvis models and then to analyze the stress, strain and displacement distribution during sideways fall and to verify the effectiveness of hip brace.
METHODS: Digital human Abaqus 6.51 software was used to build three-dimensional normal pelvis and brace-covered pelvis models. The rigid constraint surface was fixed. The whole pelvic model was loaded with 2 m/s loading. The stress, strain and displacement variation with time and contours were detected prior to and after wearing the hip brace.
RESULTS AND CONCLUSION: Compared with the normal model, the contact force between the pelvis and the ground, the maximal compression strain of the cancellous bone when the maximal contact force between the pelvis and the ground generated, the maximal strain of the greater trochanter and femoral neck, the maximal von-Mises stress of the greater trochanter and femoral neck, and the mean stress of the greater trochanter and femoral neck were significantly reduced in the brace-covered pelvis model during sideways falls. These findings indicate that the hip brace can play a protective role in the greater trochanter, and effectively reduce the incidence of intertrochanteric fractures during sideways fall.

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