Biomechanical analysis of proximal femoral nail antirotation-II and Asia 2 femur nail fixation for femoral subtrochanteric fractures in the elderly

doi:10.3969/j.issn.2095-4344.2016.31.012

Abstract

Abstract:

BACKGROUND: Biomechanical studies on elderly subtrochanteric fracture by different fixation ways were more, but study on relatively proximal femoral nail antirotation-II (PFNA) and Asia 2 femur nail (A2FN) fixation for femoral subtrochanteric fractures in the elderly was less.

OBJECTIVE: To study the biomechanical analysis of intramedullary nail PFNA-II and A2FN fixation for elderly femoral subtrochanteric fractures.

METHODS: Three-dimensional finite element models of femoral subtrochanteric fractures fixed by PFNA-II and A2FN in the elderly were established. Three-dimensional finite element analysis was used to analyze stress distribution and displacement after femoral subtrochanteric fractures by PFNA-II and A2FN fixation. RESULTS AND CONCLUSION: (1) The overall maximum stress, nail maximum stress and hip screw or spiral blade maximum stress values of PFNA-II intramedullary fixation system were higher than that of A2FN intramedullary fixation system. The distal locking maximum stress value and femoral head surface maximum stress values of PFNA-II intramedullary fixation system were lower than that of A2FN intramedullary fixation system. (2) The maximum displacement of PFNA-II intramedullary fixation system was mainly concentrated in the large trochanter and femoral head pole. The maximum displacement of A2FN intramedullary fixation system was mainly concentrated in the large trochanter. The maximum displacement of PFNA-II intramedullary fixation system was higher than that of A2FN intramedullary fixation system. The maximum axial displacement of PFNA-II intramedullary fixation system was higher than that of A2FN intramedullary fixation system. The maximum sagittal displacement of PFNA-II intramedullary fixation system was higher than that of A2FN intramedullary fixation system. The maximum coronal displacement of PFNA-II intramedullary fixation system was higher than that of A2FN intramedullary fixation system. (3) The lateral fissure, front fissure and rear fissure of PFNA-II intramedullary fixation system were higher than that of A2FN intramedullary fracture fixation system, but the difference was less pronounced. (4) The maximum stress value on fracture section of PFNA-II intramedullary fracture fixation system was lower than that of A2FN intramedullary fixation system. (5) Results showed that A2FN intramedullary fixation system for intertrochanteric fractures has better biomechanical stability than PFNA-II intramedullary fixation system for intertrochanteric fractures.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Femoral Fractures, Internal Fixators, Finite Element Analysis, Biomechanics, Tissue Engineering

CLC Number:

R318

Wang Lian-jing, Zeng Xian-tie. Biomechanical analysis of proximal femoral nail antirotation-II and Asia 2 femur nail fixation for femoral subtrochanteric fractures in the elderly[J]. Chinese Journal of Tissue Engineering Research, 2016, 20(31): 4644-4650.

Figures/Tables 3

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