载荷速率对股骨颈骨折裂纹扩展影响的有限元分析

被引:10
作者
郑利钦 [1 ]
林梓凌 [2 ,3 ]
陈心敏 [1 ]
梁子毅 [1 ]
李木生 [1 ]
郑永泽 [1 ]
机构
[1] 广州中医药大学第一临床医学院
[2] 广州中医药大学第一附属医院创伤骨科
[3] 广州中医药大学岭南医学研究中心
关键词
跌倒载荷速率; 股骨颈骨折; 裂纹扩展; 断裂力学; 有限元; 跌倒; CT数据; 股骨头下骨折;
D O I
暂无
中图分类号
R683 [骨折、骨的损伤];
学科分类号
100220 [骨科学];
摘要
背景:骨折发生发展是个动态过程,传统有限元方法不能很好地预测及展示骨折发生的确切起点、骨质断裂过程及该过程的应力、应变、裂纹扩展情况。目的:模拟不同跌倒载荷速率对股骨颈骨折裂纹扩展的影响。方法:将1名健康志愿者的股骨原始CT数据导入Mimics19.0软件,经区域增长、编辑笼罩、光滑、包裹等重建股骨近端三维有限元模型,并在Hypermesh14.0中进行松质骨、皮质骨网格划分、定义材料属性、设定边界条件、模拟股骨内旋、内收位跌倒状态、加载载荷-时间函数[F1=2500t、F2=(10000/3)t、F3=5 000t、F4=10 000t]等前处理,将生成的K文件导入LS-DYNA求解器中运算。结果与结论:(1)骨折起始裂纹均出现在股骨颈下后方,初始裂纹长度呈载荷速率依赖性;(2)皮质骨断裂时的最大应力均分布在股骨颈后外侧,随着载荷速率升高,应力分布从转子间逐渐向股骨颈缩小;(3)股骨颈的压缩应变主要集中在股骨颈下后方,在裂纹走行处出现最大应变值;(4)载荷速率越高皮质骨越早发生断裂,断裂历程越短,裂纹扩展速率越高,骨折线逐渐变粗糙并上移,形成头下型骨折,同时Pauwels角也随之增大;(5)结果说明,载荷速率会改变股骨颈骨折裂纹扩展行为,进而影响髋部骨折类型。
引用
收藏
页码:3148 / 3152
页数:5
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