Micro-CT月骨矢状面有限元模型建立及应力分析（英文）

发布时间：2019-07-07 07:26

【摘要】：背景:腕关节生物力学机制复杂,过去的研究多着眼于腕骨间应力的传导,但对腕骨内部骨小梁的应力分布及形变特点研究极少。目的:建立人月骨矢状面的二维有限元模型,并探讨在月骨矢状面上施加轴向应力时应力的分布规律及形变特点。方法:运用Micro-CT扫描离体的正常人月骨标本,将处理后的矢状面图像导入有限元分析软件,建立起月骨矢状面的二维有限元模型。在二维有限元模型上均匀地选取9个兴趣区,计算每个兴趣区的第一主应力、第三主应力及节点等效应力、平面剪切力及纵向位移,比较其大小和方向,并生成月骨矢状面二维有限元模型的形变图、各应力及位移云图。结果与结论:①人月骨矢状面的二维有限元模型分析:月骨矢状面近端兴趣区所受的应力大于远端兴趣区所受的应力;月骨矢状面掌侧兴趣区所受的应力大于背侧兴趣区所受的应力;月骨矢状面近端和远端的掌、背侧兴趣区所受的应力分别大于对应的月骨中间兴趣区所受的应力;月骨矢状面远端兴趣区被压向近端,近端中间区域的兴趣区被压向远端,而近端掌侧和背侧兴趣区的纵向位移方向随着腕关节姿势的不同而不同;屈腕位和背伸位时各兴趣区的应力和位移明显增加。此外,实验还发现应力集中区域是平面剪切力方向发生变化及轴向位移方向发生变化的主要区域。②结果证实:月骨矢状面在施加轴向应力时,其应力分布具有一定的规律,在月骨矢状面近端的掌、背侧及远端的掌、背侧形成4个应力集中区。而且,腕关节的姿势可以明显地影响月骨矢状面上所受的应力大小和分布。
[Abstract]:Background: the biomechanical mechanism of wrist joint is complex. In the past, most of the previous studies have focused on the stress conduction between carpal bones, but few studies have been done on the stress distribution and deformation characteristics of bone trabeculae in carpal bone. Aim: to establish a two-dimensional finite element model of sagittal plane of human lunar bone and to explore the distribution of stress and deformation characteristics when axial stress is applied on sagittal plane of lunar bone. Methods: the processed sagittal images were introduced into the finite element analysis software to establish the two-dimensional finite element model of the sagittal surface of the lunar bone. Nine regions of interest are uniformly selected on the two-dimensional finite element model, and the first principal stress, the third principal stress and the equivalent stress of the node, the plane shear force and the longitudinal displacement of each region of interest are calculated, the size and direction of the two-dimensional finite element model of the sagittal plane of the lunar bone are compared, and the deformation diagram, stress and displacement cloud images of the two-dimensional finite element model of the sagittal plane of the lunar bone are generated. Results and conclusion: 1 two-dimensional finite element model analysis of sagittal surface of Lunate bone: the stress in the proximal region of interest on the sagittal plane of lunar bone was greater than that in the distal region of interest, the stress on the palmar area of interest on the sagittal surface of lunar bone was greater than that in the dorsal region of interest, and the stress in the proximal and distal palms and dorsal regions of interest on the sagittal surface of lunar bone was higher than that in the middle region of interest of the corresponding lunar bone, respectively. The region of interest in the distal part of the sagittal surface of the lunar bone is pressed to the proximal end, and the region of interest in the middle region of the proximal end is pressed to the distal end, while the longitudinal displacement direction of the region of interest varies with the posture of the wrist joint, and the stress and displacement of each region of interest increase obviously in the flexion position and the back extension position. In addition, it is also found that the stress concentration region is the main area in which the direction of plane shear force changes and the direction of axial displacement changes. 2 the results show that the stress distribution of the sagittal surface of lunar bone has a certain regularity when the axial stress is applied, and four stress concentration areas are formed in the proximal palms of the sagittal surface of the lunar bone, the palms of the dorsal and distal sides, and the dorsalis of the sagittal surface of the lunar bone. Moreover, the posture of wrist joint can significantly affect the stress size and distribution on the sagittal plane of lunar bone.
【作者单位】：北京积水潭医院手外科;清华大学第一附属医院;北京大学工学院生物力学实验室;北京大学工学院;
【基金】：the National Clinical Key Construction Project-Hand Surgery,No.(2010)305 the High-Level Health Technology Talent Training Program of Beijing Health System,No.2009-3-17~~
【分类号】：R68

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