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Vestn. Samar. Gos. Tekhn. Univ., Ser. Fiz.-Mat. Nauki [J. Samara State Tech. Univ., Ser. Phys. Math. Sci.]:
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Vestn. Samar. Gos. Tekhn. Univ., Ser. Fiz.-Mat. Nauki [J. Samara State Tech. Univ., Ser. Phys. Math. Sci.], 2015, Volume 19, Number 4, Pages 768–784 (Mi vsgtu1441)  

This article is cited in 1 scientific paper (total in 1 paper)

Mechanics of Solids

Mathematical modeling of deformation of reinforced femur during prolonged static loads

V. P. Radchenko, A. V. Nekhozhin

Samara State Technical University, Samara, 443100, Russian Federation

Abstract: A two-layer mathematical model of a human femur neck reinforced implants of different design for modeling stress-strain state which occurs during a surgical procedure to prevent femur neck fractures by the forced introduction of metallic implants is proposed. Engineered implant designs are provided. Methods and software for geometric modeling of femur embedded with the implants are developed. New boundary value problems to evaluate kinetics in creep conditions of the stress-strain state of reinforced and non-reinforced femoral neck during prolonged static loads corresponding to human foot traffic are formulated. Effective elastic properties of cortical and cancellous bone, power and kinematic boundary value problems. A phenomenological creep model for compact bone tissue is constructed. The technique of identifying the parameters is developed. A check of its adequacy to experimental data is carried out. Based on the finite element method the numerical method for solving the provided boundary value problems at macro level of continuum mechanics is developed. A lot of variative calculations allowed developing recommendations for the rational positioning of the implant in order to minimize stress concentrations. The performed analysis showed that there is a significant relaxation of stresses in the most loaded areas due to creep. Relaxation is more intense in reinforced femoral neck than in the unreinforced. Thus the tension in the most loaded femoral neck area due to creep is reduced by 49 % with respect to the intensity of the initial time of loading for femur which is reinforced by the spoke-spoke-type implant when loading duration is 1 year under natural loads corresponding to human foot traffic. It was found that the time component (long-term fixed load) does not impair the positive effect of reducing the stress concentration due to a femoral neck reinforcement which is a positive fact from the medical practice point of view.

Keywords: femur bone, implant, femoral neck, geometric modeling, finite element method, creep, stress-strain state, relaxation
Author to whom correspondence should be addressed

DOI: https://doi.org/10.14498/vsgtu1441

Full text: PDF file (1134 kB) (published under the terms of the Creative Commons Attribution 4.0 International License)
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Bibliographic databases:

UDC: 539.376 + 612.76:616.71-001.5
MSC: 74L15
Original article submitted 04/VII/2015
revision submitted – 18/IX/2015

Citation: V. P. Radchenko, A. V. Nekhozhin, “Mathematical modeling of deformation of reinforced femur during prolonged static loads”, Vestn. Samar. Gos. Tekhn. Univ., Ser. Fiz.-Mat. Nauki [J. Samara State Tech. Univ., Ser. Phys. Math. Sci.], 19:4 (2015), 768–784

Citation in format AMSBIB
\Bibitem{RadNek15}
\by V.~P.~Radchenko, A.~V.~Nekhozhin
\paper Mathematical modeling of deformation of reinforced femur during prolonged static loads
\jour Vestn. Samar. Gos. Tekhn. Univ., Ser. Fiz.-Mat. Nauki [J. Samara State Tech. Univ., Ser. Phys. Math. Sci.]
\yr 2015
\vol 19
\issue 4
\pages 768--784
\mathnet{http://mi.mathnet.ru/vsgtu1441}
\crossref{https://doi.org/10.14498/vsgtu1441}
\zmath{https://zbmath.org/?q=an:06969193}
\elib{http://elibrary.ru/item.asp?id=25687502}


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    This publication is cited in the following articles:
    1. V. P. Radchenko, A. V. Nekhozhin, A. L. Matveev, “Napryazhenno-deformirovannoe sostoyanie v armirovannoi sheike bedra v usloviyakh polzuchesti”, Trudy desyatoi Vserossiiskoi nauchnoi konferentsii s mezhdunarodnym uchastiem: v 3-kh tomakh, Matematicheskoe modelirovanie i kraevye zadachi, 2016, 182–189  elib
  • Вестник Самарского государственного технического университета. Серия: Физико-математические науки
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