两种非解剖复位内固定Pauwels Ⅲ型头下型股骨颈骨折的有限元分析

doi:10.13418/j.issn.1001-165x.2017.06.015

Abstract

Abstract:

Objective　To explore and compare the biomechanical properties of two nonanatomic reductions of Pauwels Ⅲ subcapital femoral fractures fixation using finite element analysis, therefore to provide theoretic reference for clinic application.　Methods　Using a CT scan from a 25-year-old healthy male femur and the measuring data of a PH Nail (Physiological Hip Nail) and screws, positive buttress reduction and negative buttress reduction models of Pauwels Ⅲ subcapital femoral fracture fixation were developed using finite element soft wares. The maximum displacement of the fracture sites, the maximum Von Mises strain on femur, the maximum von Mises stress on implants were compared under two loading conditions simulating “stance” and “walking” respectively. 　Results　The maximum displacement of the fracture sites of two models under “stance” and “walking” conditions were 0.87 mm and 1.38 mm, 1.27 mm and 1.98 mm, respectively. The maximum Von Mises strains on femur were 1.77e-2 and 2.47e-2, 1.89e-2 and 2.12e-2, respectively. The maximum von Mises stresses on implants were 304.47 Mpa and 359.03 Mpa, 362.24 Mpa and 391.52 Mpa, respectively. Conclusions The reduction of positive buttress has better biomechanical properties than negative buttress under the same loading conditions for Pauwels Ⅲ subcapital femoral fracture fixation. Results of this study support the Yechiel Gotfried theory for Pauwels Ⅲ subcapital femoral fracture fixation from a biomechanical perspective.

Key words: Subcapital femoral fracture, 　Nonanatomic reduction, 　Positive buttress, 　Negative buttress, 　Finite element analysis

ZHENG Xiang, XU Jin-huang, HUANG jian-rong. Finite element analysis of two nonanatomic reductions of Pauwels Ⅲ subcapital femoral fractures fixation[J]. Chinese Journal Of Clinical Anatomy, 2017, 35(6): 665-670.

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Finite element analysis of two nonanatomic reductions of Pauwels Ⅲ subcapital femoral fractures fixation

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