【摘要】 目的:分析桡骨远端骨折柳木夹板外固定及其骨折愈合的生物力学特性，为临床治疗提供依据。方法:将CT影像文件转化为三维有限元模型，采用三维重建软件Mimics10.01重建了尺骨、桡骨、肌肉和夹板的实体模型，并对模型进行网格划分，经光滑处理后以STL格式输出尺骨、桡骨、肌肉和夹板的实体模型。将导出的实体模型再导入点云处理软件Geomagicstudio10中，经过去噪、光滑构造曲面片、构造格栅和生成曲面处理后，形成较为光滑的实体模型，得到的尺骨、桡骨、肌肉和夹板的实体模型以STP格式输出，导入有限元软件ANSYS12.0生成有限元实体模型。将得到的尺骨、桡骨、肌肉和夹板实体模型导入ANSYS12.0后，对肌肉和尺骨、桡骨进行布尔运算，先从肌肉模型中减去尺骨和桡骨，将得到的肌肉模型和尺骨、桡骨模型粘接，再导入夹板模型，生成包括尺骨、桡骨、肌肉和夹板的实体模型。建立桡骨远端AO分型A3骨折，模拟骨折愈合不同阶段进行应力分析。结果:实体模型分为四个接触单元，分别是桡侧夹板与前臂、尺侧夹板与前臂、背侧夹板与前臂及掌侧夹板与前臂，完成夹板绑缚前臂模型的建模。以愈合0%(骨折初始)、愈合20%和愈合50%为例，应力最大区域位于掌侧、桡侧夹板近端和腕部，最大应力分别为8.44 MPa和0.92 MPa。结论:桡骨远端骨折柳木夹板外固定的生物力学特点为压力容易集中在软组织丰厚的掌侧、桡侧夹板近端及骨突处。更多还原

【Abstract】 Objective:To study the biomechanical properties of willow splint external fixation and fracture healing for distal radius fractures, and to provide theoretical basis for clinical treatment.Methods:The CT image file was transformed into a three-dimensional finite element model that can be used for calculation.The solid model of ulna, radius, muscle, and splint was reconstructed by using the three-dimensional reconstruction software Mimics10.01,and the model was meshed.The model was performed for smooth processing before was inputted into the finite element analysis software, and then output the solid model of ulna, radius, muscle and splint in STL format.Then the derived solid model was imported into the point cloud processing software Geomagicstudio10.After denoising, smooth surface patches, grid and curved surface processing, a relatively smooth solid model was formed.The obtained solid models of ulna, radius, muscle, and splint were output in STP format and imported into the finite element software ANSYS12.0 to generate a computable finite element solid model.After introducing the solid model of ulna, radius, muscle, and splint into ANSYS12.0,the boolean operation of muscle, ulna and radius was carried out; the ulna and radius were subtracted from the muscle model; the muscle model was bonded with the model of ulna and radius, and then imported into the splint model to generate the solid model including ulna, radius, muscle and splint.AO type A3 fracture of distal radius was established, and stress analysis was performed at different stages of fracture healing.Results:The solid model was divided into four contact units, namely radial splint and forearm, ulnar splint and forearm, dorsal splint and forearm, and volar splint and forearm, to complete the modeling of the splint-bound forearm model.Taking 0% healing(initial fracture),20% healing, and 50% healing as example, the areas with the greatest stress were located at the palm side, and the proximal end of the radial splint, and the wrist, and the maximum stress was 8.44 MPa and 0.92 MPa, respectively.Conclusion:The biomechanical characteristics of willow splint external fixation of distal radius fracture are that the pressure is easy to concentrate on the palmar side of rich soft tissue, the proximal end of radial splint and bony process.更多还原