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Finite Element Analysis of a Controlled Dynamization Device for External Circular Fixation.

Fernando Ferraz Faria¹, Carlos Eduardo Miers Gruhl¹, Rafaela Rebonato Ferro²

¹Escola de Ciências da Vida, Departamento de Ciências da Saúde, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Paraná, Brazil.

Revista Brasileira De Ortopedia

|February 25, 2021

Summary

This study virtually prototyped an external fixation device for long bone fractures, using finite element analysis (FEA) to predict mechanical behavior. The device demonstrated acceptable stress support and deformation in both locked and dynamized modes, suitable for stainless steel or titanium fabrication.

Keywords:

dynamization external fixators fracture healing fractures, bone

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Area of Science:

Biomaterials Engineering
Orthopedic Biomechanics
Computational Mechanics

Background:

External fixation devices are crucial for managing long bone fractures.
Controlled dynamization can enhance fracture healing.
Predictive modeling is essential for optimizing device design.

Purpose of the Study:

To virtually prototype an external circular fixation device for long bone fractures.
To incorporate controlled dynamization capabilities into the device design.
To predict the mechanical behavior of the device using finite element analysis (FEA).

Main Methods:

3D modeling of a device with two metal parts and a silicone damper.
Finite element analysis (FEA) simulations were performed.
Evaluated two materials (stainless steel, titanium) under static and dynamic loading conditions in locked and dynamized modes.

Main Results:

The FEA model comprised 81,872 nodes and 45,922 elements.
Maximum stress peaks were observed under static loading with the device locked (140.98 MPa for stainless steel, 141.45 MPa for titanium).
Greatest displacements occurred under dynamic loading with the device locked (2.415 × 10^-3 mm for stainless steel, 3.975 × 10^-3 mm for titanium).

Conclusions:

The virtual prototype functions as a stress-supporting device.
The device exhibits acceptable deformation in both locked and dynamized modes.
Fabrication with either stainless steel or titanium is feasible.