股骨头内撑器的三维有限元分析-外科学骨科学专业论文.docxVIP

PAGE PAGE 10 股骨头内撑器的三维有限元分析 中文摘要 目的 应用三维有限元分析股骨头内撑器的生物力学性能，为其治疗成人 股骨头缺血性坏死提供生物力学依据。 方法 1.采用医用钛合金材料研制股骨头内撑器，形状为中空圆柱状，组件 包括有①顶盖②撑叶③顶紧螺帽④心柱⑤固定螺帽⑥封闭套⑦底盖。2.建立实验 标本模型①正常股骨头颈模型，②内撑器模型，③内撑器置入并植骨模型。3. 有限元分析：应用 Philips MX8000 型 64 排螺旋 CT 机由模型近端向远端垂直纵 轴进行扫描，获得图像数据。将扫描数据以 Dicom 格式导入 Mimics 软件，进行 灰度阈值调整、区域分割后，重建股骨、内撑器、内撑器置入并植骨三维有限元 模型。设定边界及载荷条件，对三种模型受压后的应力与应变情况进行有限元分 析。 结果 1.内撑器具有较好的强度和刚度，在载荷条件下，应力分散于撑叶上，分布均匀， 并沿内撑器杆向下传导，在内撑器中下段内侧存在应力集中。 2.在载荷的条件下，股骨头内撑器周围骨质应力分布较正常部位应力提高，力学 传导与正常股骨头内部分析接近，不会发生应力集中。 结论 ①应用三维有限元建立的模型逼真，能客观真实地反应模型的几何结构和力 学属性。 ②股骨头内撑器弹性模量接近并高于正常皮质骨，负载后内撑器及周围骨道 应力分布均匀，应变接近正常；与正常股骨距相似，应力沿内撑器向股骨近端传 导。 关键词 股骨头 内撑器 有限元 生物力学 Three-dimensional finite element analyze the femoral head interior supporting system Abstract Objectives: To application three-dimensional finite element analyze biomechanical properties of femoral head interior supporting system,and provide biomechanical basis for the treatment of adult femoral head necrosis. Methods:1. Femoral head interior supporting system was developed by titanium alloy of medical device stays,components including roof ①cover②leaf support③top nut④center column⑤lock nut⑥closed sets⑦bottom. 2.Model of experimental specimens were established.①normal model of the head and neck,②model of femoral head interior supporting system,③model of femoral head interior supporting system within the implantation and bone grafting. Finite element analysis:The femoral head was scaned by computer tomography along longitudinal aixs of the femoral from the proximal to the distal application of Philips MX8000 type (64-slice)spiralCT machine, to obtain image data of proximal femur.The CT scan data in Dicom format into Mimics software(Materialise, Belgium computer),the gray threshold adjustment,segmentation,the reconstruction of three-dimensional model of the femoral.According to data of the femoral head interior supporting system set three dimensional finite element model of normal model of the head and neck, head interior supporting system,an