应用三维有限元分析髋臼骨结核软骨下骨塌陷的风险

Application of Finite Element Analysis of Acetabular Tuberculosis Subchondral Bone Risk of Collapse

目的建立人体髋臼骨结核三维有限元模型,探讨不同部位髋臼骨结核软骨下骨塌陷的风险。方法通过正常髋关节CT数据,利用Mimics软件和ANSYS有限元软件,建立正常髋关节三维有限元模型(模型A)、髋臼顶部骨结核(模型B)、髋臼中心部骨结核(模型C)、髋臼前部骨结核(模型D)、髋臼后部骨结核(模型E)三维有限元模型,模拟人体单脚站立进行加载,分析髋臼软骨下骨峰值Von Mises应力和初始微动值。结果建立了正常髋关节和不同部位髋臼骨结核三维有限元模型,各模型含节点269284,三维四面体单元184786个。通过加载分析结果显示:与正常髋关节相比,峰值Von Mises应力,依次增加84%、3%、21%、67%;髋臼软骨下骨初始微动值依次增加66%、11%、17%、29%。结论髋臼顶部结核软骨下骨峰值Von Mises应力和初始微动值最大,塌陷的风险最大。

Objective To establish three-dimensional finite element model of acetabular bone tuberculosis and analyze the risk of subchondral bone collapse risk.Methods through the normal hip CT data,using Mimics software and ANSYS finite element software,establish the normal hip joint three-dimensional finite element model（model A）,the top of acetabular bone tuberculosis（model B）,the center of the acetabulum bone tuberculosis（Model C）,anterior acetabular bone tuberculosis（Model D）,posterior acetabular bone tuberculosis（model E） three-dimensional finite element model,and simulate the human standing on one foot to load,analysis of acetabular subchondral bone peak Von Mises stress and the initial micro displacement.Results Establish the normal hip joint and acetabular bone tuberculosis three-dimensional finite element model,the model contains nodes 269,284,three-dimensional tetrahedral element 184 786.The loading tests revealed： compared with the normal hip,the peak Von Mises stress,followed by an increase of 84%,3%,21%,67%;the initial micro displacement of subchondral bone followed by an increase of 66%,11%,17%,29%.Conclusion The top of acetabular bone tuberculosis alter the stress and initial micro displacement of acetabular subchondral bone significantly,Most at risk of collapse.