AF内固定器不同置钉角度的有限元分析  

Finite element analysis of AF internal fixation device under different angle of pedicle screws

作　　者：宋富立[1] 靳安民[1] 张美超[2] 张辉[1] 王瑞[1] 童斌辉[1] 闵少雄[1] 

机构地区：[1]南方医科大学附属珠江医院骨科,广州510282 [2]南方医科大学生物力学实验室,广州510515

出　　处：《中国临床解剖学杂志》2005年第3期310-312,共3页Chinese Journal of Clinical Anatomy

摘　　要：目的:研究AF内固定系统在螺钉不同置钉角度时的应力分布,寻求置钉最佳角度以减少AF内固定系统的断裂。方法:建立AF内固定系统不同置钉角度三维有限元模型,采用有限元分析法,研究模拟椎弓根螺钉不同置钉角度的压力载荷状态,观察AF内固定系统不同置钉角度受力情况。结果:(1)AF内固定系统中螺钉的根部及连接棒下部承受应力最大。(2)置钉角度的不同可以影响内固定系统的应力分布;随着水平角(TSA角0°,5°,10°,15°)增大内固定系统受力加大。结论:在加载下AF内固定器的螺钉根部及螺钉和连接棒的结合处为应力最集中的部位,容易发生疲劳和断裂。Objective: To study the stress state of AF instrument under different angle of pedicle screw. Methods: The three-dimensional finite element models of AF instrument under the different angle of pedicle screws were created in order to analyze its stress distribution during weight loading. Results: The stress distribution showed some characteristics as follow: 1) The stress endured on the end of pedicle screws and the connective part between screw and rod were larger than other parts. 2) The stress distribution of pedicle screw can be affected by the angle of the pedicle screws. As adding the TSA (0°,5°,10°,15°), the stress of device increased gradually. Conclusions: Stress of AF device concentrates on the end of pedicle screw and the connective part between screw and rod where fatigue breakage is liable to occur when excessive force is loaded.

关 键 词：椎弓根螺钉 置钉角度 生物力学 有限元法 

分 类 号：R681.4[医药卫生—骨科学]