中文摘要：

背景：骨盆经常需要在骨头肿瘤切除术以后被重建。为矫形外科医生的这里的主要挑战是选择给取决于它的简历的最好的表演机械性质的一个方法。在这研究， 3-dimensional 有限元素分析(FEA ) 被用来分析重建的骨盆使用腓骨 transplant 的机械性质由四个通常使用的杆螺丝钉系统修理了的简历。方法：包括腰骶的脊骨和近似腿节的一个彻底的骨盆的有限元素的模型从一个健康志愿者基于 CT 图象的几何学被构造。三维的有限元素模型不同植入包括腓骨，杆和螺丝钉用稳固的建模的方法被模仿。然后各种各样的重建的有限元素模型与不同有限元素 implant 模型和类型一起被装配我 resected 骨盆的有限元素模型。500 N 的负担垂直地被强加到 L3 脊椎的身体的优异表面上，并且骨盆在承受位置的双边的腿被修理。FEA 被执行在骨头上说明压力分发并且植入。所有节点和元素上的不同杆螺丝钉固定方法和最大的相等的压力(最大 EQV ) 的骨盆排水量被弄明白评估不同改造方法的优点和劣势。结果：在腓骨 transplant 的压力集中在重建的骨盆极其高，但是能被内固定实质地减少，它部分从腓骨把压力转移了到杆螺丝钉系统。高强调集中也在 implants 被发现，特别在在螺丝钉和杆之间的连接地点。在固定的四个方法之中，有 L5-S1 小花梗和肠骨螺丝钉(L5-S1 HR ) 的一个双杆系统生产了最好的表演：最不强调集中和最不全部的排水量。结论：根据稳定性和压力集中， HR 固定与腓骨移植相结合的 L5-S1 的方法比在在类型以后的骨盆的重建的另外的固定方法好我切除术。

英文摘要：

Background The pelvis often needs to be reconstructed after bone tumor resection. A major challenge here for the orthopedic surgeons is to choose a method that gives the best performance which depends upon its biomechanical properties. In this study, a 3-dimensional finite element analysis （FEA） was used to analyze the biomechanical properties of reconstructed pelvis using fibula transplant fixed by four commonly used rod-screw systems. Methods A total pelvic finite-element model including the lumbar-sacral spine and proximal femur was constructed based on the geometry of CT image from a healthy volunteer. Three-dimensional finite element models of different implants including fibula, rod and screw were simulated using ways of solid modeling. Then various reconstructed finite element models were assembled with different finite element implant model and type Ⅰ resected pelvic finite element model. The load of 500 N was imposed vertically onto the superior surface of L3 vertebral body, and the pelvis was fixed in bilateral leg standing positions. FEA was performed to account for the stress distribution on the bones and implants. The pelvis displacement of the different rod-screw fixation methods and the maximum equivalent stress （max EQV） on all nodes and element were figured out to evaluate the advantages and disadvantages of different reconstructive methods. Results Stress concentration in the fibula transplant was extremely high in the reconstructed pelvis, but could be substantially decreased by internal fixation, which partially transferred the stress from the fibula to the rod-screw systems. High stress concentration was also found in the implants, especially in the connection sites between screw arid rod. Among the four methods of fixation, a double rod system with L5-S1 pedicle and ilium screws （L5-S1 HR） produced the best performance： least stress concentrations and least total displacement. Conclusion According to the stability and stress concentration, the method of L5-S1 HR fixation