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股骨头缺血性坏死塌陷预测的生物力学研究
引用本文:崔旭,赵德伟,古长江.股骨头缺血性坏死塌陷预测的生物力学研究[J].中国临床解剖学杂志,2005,23(2):193-198.
作者姓名:崔旭  赵德伟  古长江
作者单位:1. 大连大学附属中山医院骨科
2. 大连理工大学力学系,辽宁,大连,116001
摘    要:目的:探索不同部位囊性变对股骨头缺血性坏死的生物力学影响,为预测股骨头的塌陷和指导临床治疗方法的选择提供基础。方法:取新鲜股骨上段标本,行螺旋CT断层扫描,所得图像用Efilm软件系统处理,利用Ansys-5.7大型计算机软件建立股骨上段三维有限元异物同构模型,模拟股骨头内囊性变。施加3种不同载荷,分析股骨头内应力分布情况。结果:股骨头受压后,中央区域表现为压应力,而前方和后方区域则表现为张力,符合球体受压后的膨胀趋势。股骨头负重区下方及其内侧和外侧的囊性变应力集中最明显,易引起股骨头塌陷。当囊性变位于股骨头的前方、后方、中心和下方时,其上下缘的应力集中不是很明显,股骨头塌陷断裂风险不大。结论:股骨头内不同部位的囊性变对股骨头缺血性坏死的生物力学影响是不同的,三维有限元应力分析法可以预测坏死股骨头的塌陷,并指导临床选用适当的显微外科治疗方法。

关 键 词:股骨头  缺血性坏死  生物力学  治疗  计算机辅助
文章编号:1001-165X(2005)02-0193-06
修稿时间:2004年7月12日

Biomechanical study on predicting the collapse of ischemic necrosis of the femoral head
CUI Xu,ZHAO De-wei,GU Chang-jiang.Biomechanical study on predicting the collapse of ischemic necrosis of the femoral head[J].Chinese Journal of Clinical Anatomy,2005,23(2):193-198.
Authors:CUI Xu  ZHAO De-wei  GU Chang-jiang
Institution:CUI Xu,ZHAO De-wei,GU Chang-jiang Department of Orthopaedics,Zhongshan Hospital of Dalian University,Dalian 116001,China
Abstract:Objective:To explore the biomechanical influences of cystic degeneration in different locations on femoral head, and predict the collapse of the articular surface and guide the appropriated microsurgical treatment to preserve the femoral head. Methods:To scan a upper femur specimen with SCT and deal the two-dimensional image with Efilm software, identify the outline of the femoral head by range estimation, input coordinate value of the femur into the computer to build up three-dimensional finite element model of the upper femur by Ansys-5.7 software, then simulate cystic degeneration by analogue computer and put three kinds of pressure on the femoral head respectively to analyze the stress distribution and the stress/strength ration ,while predict the collapse of the femoral head. Results:The central part of the femoral head displayed stress, however the anterior and posterior part of the femoral head displayed tension, which was in conformity with the principle of ball expansion after being compressed. The tension concentrated on the site beneath the underside of the loading area and the site medial or lateral of the loading area on the femoral head, which tended to cause the collapse of the femoral head. When the cyst located on the central and inferior parts of the femoral head, the tension concentration was not obvious and the stress/strength ratio of the cancellous bone under the articular surface was normal and the femoral head had little danger of collapse. Conclusions:The cystic degeneration locating on the different part of the femoral head influences its biomechanical mechanism differently, which show different collapse probability of the femoral head. The stress analysis basing on three-dimensional finite element theory can predict the collapse of the femral head and guide the appropriate microsurgical treatment.
Keywords:femoral head  ischemic necrosis  biomechanics  therapy  computer-assisted
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