中国组织工程研究

中国组织工程研究 ›› 2010, Vol. 14 ›› Issue (52): 9873-9876.doi: 10.3969/j.issn.1673-8225.2010. 52.046

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

步态下正常股骨的应力应变、主应力线及微动分布特征

白雪岭1，尚  鹏2，王成焘2   

  1. 1中山大学工学院，广东省广州市  510006；2上海交通大学机械与动力工程学院，上海市  200240
  • 出版日期:2010-12-24 发布日期:2010-12-24
  • 通讯作者: 王成焘，教授，上海交通大学机械与动力工程学院，生物医学制造与生命质量工程研究所，上海市 200240
  • 作者简介:白雪岭☆，男，1977年生，河北省涿县人，汉族，2006年华中科技大学毕业，博士，讲师，主要从事人体生物力学，运动生物力学的研究。
  • 基金资助:

    国家自然科学基金资助项目(30530230，30470455)。

Distribution features of stress-strain, principle stress vectors and displacements of normal femur during gait

Bai Xue-ling1, Shang Peng2, Wang Cheng-tao2   

  1. 1 School of Engineering, Sun Yat-sen University, Guangzhou  510006,Guangzhou Province, China;    2 School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai  200240, China
  • Online:2010-12-24 Published:2010-12-24
  • Contact: Wang Cheng-tao, Professor, School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • About author:Bai Xue-ling☆, Doctor, Lecturer, School of Engineering, Sun Yat-sen University, Guangzhou 510006,Guangzhou Province, China xlbai@sjtu.edu.cn
  • Supported by:

    the National Natural Science Foundation of China, No. 30530230, 30470455**

PDF

398

被引次数

5

摘要：

背景： 研究表明，在运动载荷增大或者有冲击载荷产生的时候，股骨干中下段发生疲劳、断裂破坏的概率最大。
目的：分析正常步态条件下股骨的应力应变分布、主应力线分布以及微动分布的力学特征。
方法：首先，对志愿者大腿进行CT扫描，提取股骨及附着其上的肌肉轮廓，并构建股骨的骨肌系统面模型。其次，构建下肢肌肉的直线模型，并利用多刚体动力学优化方法对步态下股骨的肌肉力和关节力进行预测。最后，将肌肉力和关节力预测结果作为有限元边界条件，计算获取步态下正常股骨的应力应变分布、主应力线分布以及位移分布。
结果与结论：步态下，股骨最大位移发生在股骨头位置，最大应力发生在股骨体中下段。股骨体中下段和股骨颈处存在较大的拉应力集中。从生物力学角度，验证了股骨骨折多发于股骨体中下段、股骨颈处的原因。

关键词: 步态, 股骨, 应力应变, 生物力学, 有限元分析

Abstract:

BACKGROUND: Studies demonstrated that, the probability of middle and distal end of femur bone fatigue or fracture reaches maximum when the moving loads increase or under an impact load.
OBJECTIVE: To analyze the stress-strain distribution, principle stress vectors and displacements of femur during gait.
METHODS: The contour curves of femur and muscles attached to femur were extracted slice by slice based on the serial CT data from a healthy male volunteer, which were used to build musculoskeletal system models. And the straight-line muscle models of the lower extremities were constructed to evaluate muscles forces and joints forces by using a multi-objective optimization method based on gait analysis. The finite element models of femur during gait were built by taking muscle forces and joint forces as boundary conditions in ANSYS 10.0 to obtain the stress-strain distribution and displacements.
RESULTS AND CONCLUSION: The maximal displacement occurred on the femur head, and the maximal stress occurred in the middle and distal end of femur during the whole gait. There exists bigger tensile stress in the location of the femur neck and middle and distal end of corpus ossis femoris. The result validates the fact that femur fracture often happens at the middle and below of femur stem from the viewpoint of biomechanics.

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