title: Constitutive formulation and numerical analysis of the biomechanical behaviour of forefoot plantar soft tissue.
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.
authors.affiliation: Centre for Mechanics of Biological Materials, University of Padova, Padova, Italy chiaragiulia.fontanella@unipd.it.
authors.forename: Chiara Giulia
authors.initials: CG
authors.lastname: Fontanella
authors.affiliation: Centre for Mechanics of Biological Materials, University of Padova, Padova, Italy.
authors.forename: Elena
authors.initials: E
authors.lastname: Favaretto
authors.affiliation: Centre for Mechanics of Biological Materials, University of Padova, Padova, Italy Department of Industrial Engineering, University of Padova, Padova, Italy.
authors.forename: Emanuele Luigi
authors.initials: EL
authors.lastname: Carniel
authors.affiliation: Centre for Mechanics of Biological Materials, University of Padova, Padova, Italy Department of Industrial Engineering, University of Padova, Padova, Italy.
authors.forename: Arturo Nicola
authors.initials: AN
authors.lastname: Natali
mesh_terms: D000328:Adult; D000368:Aged; D001696:Biomechanical Phenomena / Q000502:physiology*; D003198:Computer Simulation; D004548:Elasticity; D020342:Finite Element Analysis; D005528:Foot / Q000033:anatomy & histology* / Q000502:physiology*; D006801:Humans; D021621:Imaging, Three-Dimensional; D008875:Middle Aged; D008954:Models, Biological; D014783:Viscosity
keywords: Plantar soft tissue; constitutive analysis; forefoot; numerical models; visco-elasticity