中国组织工程研究 ›› 2019, Vol. 23 ›› Issue (8): 1208-1213.doi: 10.3969/j.issn.2095-4344.0396

• 骨与关节生物力学 bone and joint biomechanics • 上一篇    下一篇

复合载荷条件下运动膝关节软骨的数值分析

李进军,门玉涛,张春秋   

  1. 天津市先进机电系统设计与智能控制重点实验室、机电工程国家级实验教学示范中心,天津市  300384
  • 出版日期:2019-03-18 发布日期:2019-03-18
  • 通讯作者: 张春秋,博士,教授,天津市先进机电系统设计与智能控制重点实验室、机电工程国家级实验教学示范中心,天津市 300384
  • 作者简介:李进军,男,1992年生,湖北省孝昌县人,汉族,天津理工大学在读硕士,主要从事生物力学、膝关节软骨研究。
  • 基金资助:

    国家自然科学基金面上项目(11672208);国家自然科学重点基金(11432016);天津市自然科学基金重点项目(18JCZDJC36100)

Numerical analysis of knee articular cartilage under compound loads

Li Jinjun, Men Yutao, Zhang Chunqiu   

  1. Tianjin Key Laboratory of Advanced Electromechanical System Design and Intelligent Control, National Experimental Teaching Demonstration Center of Mechanical and Electrical Engineering, Tianjin 300384, China
  • Online:2019-03-18 Published:2019-03-18
  • Contact: Zhang Chunqiu, PhD, Professor, Tianjin Key Laboratory of Advanced Electromechanical System Design and Intelligent Control, National Experimental Teaching Demonstration Center of Mechanical and Electrical Engineering, Tianjin 300384, China
  • About author:Li Jinjun, Master candidate, Tianjin Key Laboratory of Advanced Electromechanical System Design and Intelligent Control, National Experimental Teaching Demonstration Center of Mechanical and Electrical Engineering, Tianjin 300384, China
  • Supported by:

    the National Natural Science Foundation of China (General Program), No. 11672208; the National Natural Science Foundation of China (Key Program), No. 11432016; the Natural Science Foundation of Tianjin (Key Program), No. 18JCZDJC36100

摘要:

文章快速阅读:

 
 

 

文题释义:
膝关节运动学:股胫关节在3个解剖轴上有6个自由度,在每一个轴(纵轴、前后轴和横向轴),胫骨相对于股骨既可以平移也可以旋转,由此形成了6个成对运动:屈/伸、内/外翻和内/外旋转;关节压缩/拉离、前后轴向平移以及横向平移。
膝关节运动所受复合载荷:在人体的正常活动中,关节软骨受到直接压缩,滑动剪切和滚压载荷。正常行走过程中股骨远端与胫骨近端相互接触,滚压载荷出现在一个步态周期的初始,此时脚尖着地,膝关节受力较大,股骨远端与胫骨近端相对滚动,滑动载荷是在一个步态周期中逐渐增加,直至胫骨摆动,股骨远端与胫骨近端相对滑动,此时受力较小。因此力学环境可选择滚压载荷、滑动载荷、动态压缩以及可能的复合载荷作为加载条件。
 
摘要
背景:有报道通过建立软骨两相模型,数值模拟循环压缩载荷下固体基质的应变,在细胞水平上研究了机械刺激对关节炎的影响。但考虑软骨实际运动所受到变化的载荷和运动角度方面的研究较少。
目的:揭示膝关节软骨的压缩、滚动、滑动或旋转以及复合载荷下的力学状态。
方法:建立考虑钙化层、软骨下骨作用的关节软骨模型,使模型更接近完整的软骨天然生理结构。膝关节运动为胫骨平台与股骨远端的相对运动,简化为一刚化球体作用在平面软骨的几何模型。考虑屈伸、内/外翻及内/外旋转等运动特性,建立人行走时膝关节可实现复合载荷的三维有限元模型。研究膝关节软骨的压缩、滚动、滑动或旋转及复合载荷下的数值分析。
结果与结论:①模拟步态过程中,关节软骨所受的最大应力区域分布在软骨下骨;②随着压缩过程的进行,Mises应力、应变与孔隙压力随压缩量的增大而增大,且增幅呈非线性减小的趋势;③结果发现,滚压载荷与总的复合载荷最为接近,可为组织工程体外功能化培养实验和方案的设计提供数据参考。

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程
ORCID: 0000-0002-2407-9193(李进军)

关键词: 关节软骨, 软骨组织工程, 复合载荷, 数值分析, 股胫关节, 膝关节运动复合载荷

Abstract:

BACKGROUND: By establishing biphasic cartilage model and simulating solid matrix stress under compressive load, the effect of mechanical stimulation on arthritis is investigated at molecular level. However, the changes of loads and movement angle of cartilage in actual exercise are little reported. 

OBJECTIVE: To reveal the mechanical characteristics of knee joint cartilage under compression, rolling, sliding or rotation and combined loads.
METHODS: An articular cartilage model considering the role of the calcified layer and subchondral bone was established, which was closer to the natural physiological structure of cartilage. The motion of the knee joint was the relative motion between tibial plateau and distal femur, which was simplified as a geometric model of rigid sphere acting on the plane cartilage. Considering the kinematics of flexion, extension, introversion, extroversion, internal rotation and external rotation, the three-dimensional finite element model of knee joint during walking under combined load was established. The mechanical characteristics of knee joint cartilage under compression, rolling, sliding or rotation and combined loads were analyzed. 
RESULTS AND CONCLUSION: (1) In the gait process, the maximum stress area of articular cartilage was distributed on the subchondral bone. (2) With the progress of the compression, the Mises stress, strain and pore pressure increased with the compressive load increasing, and the increase range showed a trend of nonlinear decrease. (3) These results imply that the rolling load is closest to the total combined loads, which provides reference for the in vitro functional cultivation of tissue-engineered cartilage and protocol design. 

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

Key words: Cartilage, Articular, Gait, Numerical Analysis, Computer-Assisted, Tissue Engineering

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