Constitutive formulation and numerical analysis of the biomechanical behaviour of forefoot plantar soft tissue

Author:

Fontanella Chiara Giulia1,Favaretto Elena1,Carniel Emanuele Luigi12,Natali Arturo Nicola12

Affiliation:

1. Centre for Mechanics of Biological Materials, University of Padova, Padova, Italy

2. Department of Industrial Engineering, University of Padova, Padova, Italy

Abstract

The aim of this work is to provide a numerical approach for the investigation of the mechanical behaviour of the forefoot soft tissues. The development of reliable numerical models of biological structures requires the definition of constitutive formulations that actually interpret the mechanical response of the constituent biological tissues and their structural arrangement. A specific visco-hyperelastic constitutive model is provided to account for the typical features of soft plantar tissue mechanics, as geometric and material non-linearity, almost-incompressible behaviour and time-dependent phenomena. Constitutive parameters are evaluated by the analysis of experimental data from compression and stress relaxation tests on tissue samples. A three-dimensional finite element model of the forefoot region is developed starting from the analysis of biomedical images, leading to the evaluation of overall structural response. The reliability of model and analyses is assessed by the comparison of experimental and numerical results pertaining to indentation tests. The numerical model developed allows to evaluate the mechanical response of plantar soft tissue in terms of stress and strain distribution.

Publisher

SAGE Publications

Subject

Mechanical Engineering,General Medicine

Reference35 articles.

1. Local plantar pressure relief in therapeutic footwear: design guidelines from finite element models

2. Finite Element Modeling of the First Ray of the Foot: A Tool for the Design of Interventions

3. Petre MT. Investigating the internal stress/strain state of the foot using magnetic resonance imaging and finite element analysis. PhD Thesis, Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, 2007.

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