桡骨三维模型的建立及其生物力学意义

背景桡骨骨折常遗留严重的并发症如骨不连等,采用新的生物力学分析手段为肱骨骨折、骨不连的功能预后提供新思路.目的建立桡骨三维有限元模型,并探讨其相关的生物力学意义.设计以三维有限元模型分析桡骨生物力学特征.单位解放军第二军医大学附属长海医院骨科和同济大学生命科学与生物工程学院. 材料实验于2001-01/2003-05在解放军第二军医大学长海医院骨科实验室和同济大学生命科学与生物工程学院实验室完成.选择典型的成年男性湿桡骨标本1根,行CT成像得到桡骨每层横截面图像.方法采用大型有限元分析软件ANSYS 5.6建立桡骨三维模型,建模步骤为①对齐切片.②确定坐标原点.③提取轮廓.采用三维十结点四面体实体单元进行网格划分及计算.主要观察指标①构建的桡骨三维有限元模型的生物力学特性.②三维有限元分析及计算.结果所构建桡骨三维模型,共划分为76 089个结点、49111个单元,客观反映桡骨真实解剖形态及生物力学行为,同时与CT切片图相对比以判断其精确性.结论桡骨三维有限元模型的构建,可以为桡骨正常力学行为以及骨折后内固定的力学基础研究提供精确模型.

Construction of three-dimensional model of radius and its biomechanical slgnificance

BACKGROUND: Serious complications like bone disunion, etc. are often left over after radius fracture. New biomechanical analytical methods are adopted to provide new approaches to the functional prognosis on radius fracture and bone disunion.OBJECTIVE: To construct three-dimensional model and explore its correlated biomechanical significance.DESIGN: To construct three-dimensional finite element model of radius and analyze the biomechanical characteristics of radius.SETTING: Department of Orthopaedics, Changhai Hospital, Second Military Medical University of Chinese PLA; College of Life Science and Bioengineering, Tongji University.PARTICIPANTS: The study was conducted in the laboratory of Department of Orthopaedics, Changhai Hospital, Second Military Medical University of Chinese PLA and Laboratory of College of Life Science and Bioengineering, Tongji University from January 2001 to May 2003. One piece of typical adult male wet radius sample was selected. Cross section image of each radius layer was obtained from the selected wet radius sample by CT scanning.METHODS: Three-dimensional model of radius was constructed using large finite element analytic software ANSYSS.6. The procedure of modtetrahedron entity unit was used to perform graticide division and calculation.three-dimensional finite element mode.RESULTS: The constructed three-dimensional model of radius was divided into 76089 nodes and 49111 units, which reflects the true anatomic morphology and biomechanical behavior externally. Its precision is judged by comparison with CT image.CONCLUSION: The construction of three-dimensional finite element model of radius provides a precise model for the researches of normal mechanical behavior of radius and the basic mechanics of internal fixation after fracture.