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research-article

Modeling and Identification of Mechanical Properties of Achilles Tendon with application to health monitoring

[+] Author and Article Information
Piotr Kohut

AGH University of Science and Technology, Department of Robotics and Mechatronics, Faculty of Mechanical Engineering and Robotics, A. Mickiewicza 30, 30-059 Krakow, Poland
pko@agh.edu.pl

Krzysztof Holak

AGH University of Science and Technology, Department of Robotics and Mechatronics, Faculty of Mechanical Engineering and Robotics, A. Mickiewicza 30, 30-059 Krakow, Poland
holak@agh.edu.pl

Rafal Obuchowicz

Department of Radiology, Collegium Medicum, Jagiellonian University, Sw. Anny 12, 31-008 Krakow, Poland
gechrzas@cyf-kr.edu.pl

Martyna Ekiert

AGH University of Science and Technology, Department of Robotics and Mechatronics, Faculty of Mechanical Engineering and Robotics, A. Mickiewicza 30, 30-059 Krakow, Poland
mekiert@agh.edu.pl

Andrzej Mlyniec

AGH University of Science and Technology, Department of Robotics and Mechatronics, Faculty of Mechanical Engineering and Robotics, A. Mickiewicza 30, 30-059 Krakow, Poland
mlyniec@agh.edu.pl

Lukasz Ambrozinski

AGH University of Science and Technology, Department of Robotics and Mechatronics, Faculty of Mechanical Engineering and Robotics, A. Mickiewicza 30, 30-059 Krakow, Poland
ambrozin@agh.edu.pl

Krzysztof A. Tomaszewski

Department of Anatomy, Collegium Medicum, Jagiellonian University, Kopernika 12, 31-034 Krakow, Poland
krzysztof.tomaszewski@uj.edu.pl

Tadeusz Uhl

AGH University of Science and Technology, Department of Robotics and Mechatronics, Faculty of Mechanical Engineering and Robotics, A. Mickiewicza 30, 30-059 Krakow, Poland
tuhl@agh.edu.pl

1Corresponding author.

ASME doi:10.1115/1.4042397 History: Received July 20, 2018; Revised December 21, 2018

Abstract

In this study, we develop a modeling and experimental framework for multiscale identification of the biomechanical properties of the human Achilles tendon. For this purpose, we extend our coarse-grained model of collagen fibrous materials with a chemomechanical model of collagen type I decomposition. High-temperature degradation of molecular chains of collagen in a water environment was simulated using a reactive molecular dynamics method. The results from molecular dynamics simulations allowed us to define the Arrhenius equation for collagen degradation kinetics and calculate the energy of activation together with the frequency factor. Kinetic coefficients obtained from a Molecular Dynamics (MD) simulations were further used to provide better calibration of the a Coarse Grained (CG) model of collagen denaturation. For the experimental part of our framework, we performed a uniaxial tensile test of the human AT with additional use of Digital Image Correlation for ex-vivo strain tracking. Using a different path of strain tracking, we were able to include the inhomogeneity of deformation and, therefore, regional variations in tissue stiffness. Our results, both in modeling and the experimental part of the study, are in line with already existing reports and thus provide an improved approach for multiscale biomechanical and chemomechanical studies of the human Achilles Tendon.

Copyright (c) 2018 by ASME
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