Dynamic finite element analysis of unstable intertrochanteric fractures fixed with PFNA-Ⅱ
JIANG Ziwei
HU Qunsheng
HUANG Feng
ZHENG Xiaohui
ZHAO Jingtao
ZHOU Qishi
Abstract：Objective To explore the dynamic biomechanical properties of unstable intertrochanteric fracture fixed with proximal femoral nail antirotation Ⅱ(PFNA-Ⅱ)through finite element analysis,and therefore to provide theoretical foundation for clinic application.Methods Finite element model of Evans IV intertrochanteric fracture fixed by PFNA-Ⅱwas developed.We simulated the conditions of fracture union and internal fixation removal by adjusting the contact relation-ship of fractures and taking out of PFNA-Ⅱ.Stress peak and biomechanical stability of models were compared with normal femur model through finite element analysis.Results The highest stress concentration area of fixation models was located in the caudal passage of the blade through the nail.After fracture union,the stress of internal fixation increased.After in-ternal fixation was removed,the stress of femoral neck increased significantly and the stability decreased.Conclusions In order to avoid internal fixation rupture after fracture union,PFNA-Ⅱ should be removed,meanwhile the risk of femoral neck fracture requires attention.
Keywords：intertrochanteric fracturesinternal fixationproximal femoral nail antirotation Ⅱfinite element analysis
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 14-17,21 )