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Experimental Mechanics

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17-08-2020 | Research paper

Methodology for Bone–Implant Stiffness Evaluation

Authors: N. Rosa, S. M. O. Tavares, R. J. C. Carbas, R. Simoes, F. D. Magalhães, A. T. Marques

Published in: Experimental Mechanics | Issue 9/2020

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Abstract

Background

It has been difficult to improve the intramedullary nail technique because of the lack of consistency in the procedures used to evaluate the bone-implant stiffness.

Objective

The goal of this study was to develop a simple methodology for determining the stiffness of a bone implant that considers the physiological loads and bone orientation, and allows a finite element analysis and its validation using mechanical experimentation.

Methods

Finite element models for a composite tibia before and after an intramedullary nail was implanted were created and validated using the results of a set of mechanical experiments, in which the stiffness values of the model were measured and compared under axial compression, 4-point bending, shear, and torsional loads considering the patient’s condition in the early healing phase. Grips with personalized bone interfaces were developed to guarantee the physiological loads and bone orientation.

Results

In the 4-point bending, torsional, and shear loading modes, the developed bone-implant finite element model showed a satisfactory level of predictive potential in relation to the experimental observations, with a percentage variation of less than 35%. This study also demonstrated that despite the high stiffness of the bone-implant construct, motion was always generated at the interfragmentary site during the early healing phase. In addition, during this stage, the nail supported most of the load applied to the lower limb (up to 85%).

Conclusions

This strategy could contribute to the future determination of the ideal mechanical environment at a fracture site and how this environment evolves throughout the healing process.

previous article Full-Field Measurement of Residual Stresses in Composite Materials Using the Incremental Slitting and Digital Image Correlation Techniques

next article Circumferential Rosette Design for Extended Depth Hole-Drilling Residual Stress Measurements

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Title: Methodology for Bone–Implant Stiffness Evaluation
Authors: N. Rosa
S. M. O. Tavares
R. J. C. Carbas
R. Simoes
F. D. Magalhães
A. T. Marques
Publication date: 17-08-2020
Publisher: Springer US
Published in: Experimental Mechanics / Issue 9/2020
Print ISSN: 0014-4851
Electronic ISSN: 1741-2765
DOI: https://doi.org/10.1007/s11340-020-00654-w

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Abstract

Background

Objective

Methods

Results

Conclusions

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