(广州市番禺区中医院，广东 广州 511400)
(Guangzhou Panyu Hospital of Traditional Chinese Medicine, Guangdong Guangzhou 511400)
〔摘 要〕 目的：构建三维有限元模型，借助三维有限元技术针对桡骨远端应力传导及分布水平进行评估，进而为临床诊断提供参考。方法：以健康成年男性左前臂作为研究样本，经桡骨纵轴针对冠状面进行电子计算机断层扫描（CT）技术，扫描层距大概是 2 mm，将断面 CT 检测数据导入到计算机中，以 3D–DOCTOR（3.5 版本）进行桡骨远端 3D 有限元模型的构建；在 ANSYS（10.0 版本）中置入模型，设置合理的边界条件，并且进行负荷加载处理，针对桡骨远端展开应力传达及分布设置，并在此基础上完成三维有限元评估。结果：借助 CT 技术，分析各层面的图像信息，并且借助 3D–DOCTOR（3.5 版本）展开构建，实现桡骨远端模型；针对有限元分析数据进行分析，若是出现 Colles 骨折的症状，桡骨密质骨及松质骨相接的位置会出现应力集中度显著提升的现象，并且掌侧拉应力相对于背侧而言，会显著提升；若是出现 Smith 骨折症状，桡骨密质骨及松质骨相接的位置会出现应力集中度显著提升，可是背侧拉应力会显著强于掌侧。结论：联系 CT 技术及 3D–DOCTOR（3.5 版本）进行三维有限元模型的构建，此种方式具备有效、便捷的优势，所呈现的模型具备良好的精确 性；根据有限元分析数据可知，桡骨骨折伸直型裂纹会在桡骨表面密质骨及松质骨相接的掌侧位置产生。
〔Abstract〕Objective To construct a three-dimensional finite element model and evaluate the stress conduction anddistribution level of the distal radius with the help of three-dimensional finite element technology, so as to provide reference for clinical diagnosis. MethodsThe left forearm of healthy adult male was used as the study sample. CT technique was performed on the coronal plane of the longitudinal axis of the radius with a scanning interval of about 2 mm. CT detection data of the section was imported into the computer, and a 3D finite element model of the distal radius was constructed using 3D-Doctor (version 3.5). The model was placed in ANSYS (version 10.0), reasonable boundary conditions were set, and load processing was carried out. The stress transmission and distribution Settings were carried out for the distal radius, and the three-dimensional finite element evaluation was completed on the basis of this. Results CT technology was used to analyze the image information at all levels, and 3D-Doctor (version 3.5) was used to construct the distal radius model. According to the analysis of the finite element analysis data, if the symptoms of Colles fracture are present, the stress concentration of the radius where the dense bone and cancellous bone meet will be significantly increased, and the volar tensile stress will be significantly increased compared with the dorsal. In the presence of Smith fracture symptoms, there is a significant increase in stress concentration where the dense bone and cancellous bone of the radius meet, but the dorsal tensile stress is significantly stronger than the palmar. ConclusionCombined with CT technology and 3D-DOCTOR (version 3.5) to construct 3D finite element model, this method has the advantages of effectiveness and convenience, and the presented model has good accuracy. According to the finite element analysis data, the extensional crack of the radial fracture will occur in the palmar position where the dense bone and the cancellous bone meet on the radial surface.