【摘要】：背景:腕關節(jié)生物力學機制復雜,過去的研究多著眼于腕骨間應力的傳導,但對腕骨內部骨小梁的應力分布及形變特點研究極少。目的:建立人月骨矢狀面的二維有限元模型,并探討在月骨矢狀面上施加軸向應力時應力的分布規(guī)律及形變特點。方法:運用Micro-CT掃描離體的正常人月骨標本,將處理后的矢狀面圖像導入有限元分析軟件,建立起月骨矢狀面的二維有限元模型。在二維有限元模型上均勻地選取9個興趣區(qū),計算每個興趣區(qū)的第一主應力、第三主應力及節(jié)點等效應力、平面剪切力及縱向位移,比較其大小和方向,并生成月骨矢狀面二維有限元模型的形變圖、各應力及位移云圖。結果與結論:①人月骨矢狀面的二維有限元模型分析:月骨矢狀面近端興趣區(qū)所受的應力大于遠端興趣區(qū)所受的應力;月骨矢狀面掌側興趣區(qū)所受的應力大于背側興趣區(qū)所受的應力;月骨矢狀面近端和遠端的掌、背側興趣區(qū)所受的應力分別大于對應的月骨中間興趣區(qū)所受的應力;月骨矢狀面遠端興趣區(qū)被壓向近端,近端中間區(qū)域的興趣區(qū)被壓向遠端,而近端掌側和背側興趣區(qū)的縱向位移方向隨著腕關節(jié)姿勢的不同而不同;屈腕位和背伸位時各興趣區(qū)的應力和位移明顯增加。此外,實驗還發(fā)現(xiàn)應力集中區(qū)域是平面剪切力方向發(fā)生變化及軸向位移方向發(fā)生變化的主要區(qū)域。②結果證實:月骨矢狀面在施加軸向應力時,其應力分布具有一定的規(guī)律,在月骨矢狀面近端的掌、背側及遠端的掌、背側形成4個應力集中區(qū)。而且,腕關節(jié)的姿勢可以明顯地影響月骨矢狀面上所受的應力大小和分布。
[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.
【作者單位】： 北京積水潭醫(yī)院手外科;清華大學第一附屬醫(yī)院;北京大學工學院生物力學實驗室;北京大學工學院;
【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~~
【分類號】：R68

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