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CC BY-NC-ND 4.0 · Rev Bras Ortop (Sao Paulo) 2021; 56(01): 036-041
DOI: 10.1055/s-0040-1721368
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Finite Element Analysis of a Controlled Dynamization Device for External Circular Fixation

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Fernando Ferraz Faria 
1   Escola de Ciências da Vida, Departamento de Ciências da Saúde, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Paraná, Brazil
,
Carlos Eduardo Miers Gruhl 
1   Escola de Ciências da Vida, Departamento de Ciências da Saúde, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Paraná, Brazil
,
Rafaela Rebonato Ferro 
2   Departamento de Ortopedia e Traumatologia, Hospital Universitário Cajuru, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Paraná, Brazil
,
Rodrigo Nunes Rached 
3   Programa de Pós-Graduação em Odontologia, Faculdade de Ciências da Vida, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Paraná, Brazil
,
Jamil Faissal Soni 
4   Programa de Pós-Graduação em Medicina, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Paraná, Brazil
,
Paula Trevilatto 
3   Programa de Pós-Graduação em Odontologia, Faculdade de Ciências da Vida, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Paraná, Brazil
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Abstract

Objective To virtually prototype a device for external circular fixation of long bone fractures with controlled dynamization made of two different materials and predict their mechanical behavior by using the finite element analysis (FEA) method.

Method A software was used for 3D modeling two metal parts closely attached by a sliding dovetail joint and a high-density silicone damper. Distinctive FEAs were simulated by considering two different materials (stainless steel or titanium), modes (locked or dynamized) and loading conditions (static/point or dynamic/0.5 sec) with uniform 150 kg axial load on top of the device.

Results The finite elements (FEs) model presented 81,872 nodes and 45,922 elements. Considering stainless steel, the maximum stress peak (140.98 MPa) was reached with the device locked under static loading, while the greatest displacement (2.415 × 10−3 mm) was observed with the device locked and under dynamic loading. Regarding titanium, the device presented the maximum stress peak (141.45 MPa) under static loading and with the device locked, while the greatest displacement (3.975 × 10−3 mm) was found with the device locked and under dynamic loading.

Conclusion The prototyped device played the role of stress support with acceptable deformation in both locked and dynamized modes and may be fabricated with both stainless steel and titanium.

Keywords

fractures, bone - external fixators - fracture healing - dynamization


Publikationsverlauf

Eingereicht: 31. Januar 2020

Angenommen: 17. September 2020

Artikel online veröffentlicht:
19. Februar 2021

© 2021. Sociedade Brasileira de Ortopedia e Traumatologia. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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