髋关节外固定器对股骨头压力影响的三维有限元分析

目的从三维有限元分析的角度,探讨髋关节外固定器对股骨头压力的影响。方法建立正常的髋关节三维有限元模型、安装单轴髋关节外固定器(A型)髋关节三维有限元模型、安装双轴髋关节外固定器(B型)的髋关节三维有限元模型,应用接触压力分析的方法,观察并分析髋关节双足站立位、单腿站立髋关节中立位股骨头的峰值压力,并进行统计学分析。结果髋关节外固定器均能减少股骨头的接触压力(P<0．05),髋关节外固定器在双腿站立时减少最明显,B型髋关节外固定器组较A型髋关节外固定器的股骨头接触压力减小。结论髋关节外固定器可减少股骨头的压力,可辅助治疗髋关节疾病。

Three dimensional finite element analysis on pressure of femoral head affected by hip external fixator

Objective To investigate pressure of femoral head affected by hip external fixator according to three dimensional finite element analysis. Methods The three dimensional finite element hip models of normal, type A hip external fixator with single-axis, type B hip external fixator with double-axis were established to observe and analyse pressure of femoral head in double-leg stance, single-leg stance . Results It was found that hip external fixator can decrease pressure on femoral head (P<0.05), especially in double-leg stance. Type B hip external fixator can decrease pressure on femoral head greatly than type A. Conclusion Hip external fixator can decrease pressure on femoral head, and it can assist on treating hip disease.