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Pettenuzzo S, Belluzzi E, Pozzuoli A, Macchi V, Porzionato A, Boscolo-Berto R, Ruggieri P, Berardo A, Carniel EL, Fontanella CG. Mechanical Behaviour of Plantar Adipose Tissue: From Experimental Tests to Constitutive Analysis. Bioengineering (Basel) 2023; 11:42. [PMID: 38247919 PMCID: PMC10813593 DOI: 10.3390/bioengineering11010042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 12/22/2023] [Accepted: 12/28/2023] [Indexed: 01/23/2024] Open
Abstract
Plantar adipose tissue is a connective tissue whose structural configuration changes according to the foot region (rare or forefoot) and is related to its mechanical role, providing a damping system able to adsorb foot impact and bear the body weight. Considering this, the present work aims at fully describing the plantar adipose tissue's behaviour and developing a proper constitutive formulation. Unconfined compression tests and indentation tests have been performed on samples harvested from human donors and cadavers. Experimental results provided the initial/final elastic modulus for each specimen and assessed the non-linear and time-dependent behaviour of the tissue. The different foot regions were investigated, and the main differences were observed when comparing the elastic moduli, especially the final elastic ones. It resulted in a higher level for the medial region (89 ± 77 MPa) compared to the others (from 51 ± 29 MPa for the heel pad to 11 ± 7 for the metatarsal). Finally, results have been used to define a visco-hyperelastic constitutive model, whose hyperelastic component, which describes tissue non-linear behaviour, was described using an Ogden formulation. The identified and validated tissue constitutive parameters could serve, in the early future, for the computational model of the healthy foot.
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Affiliation(s)
- Sofia Pettenuzzo
- Department of Civil, Environmental and Architectural Engineering, University of Padova, 35131 Padova, Italy; (S.P.); (A.B.)
| | - Elisa Belluzzi
- Musculoskeletal Pathology and Oncology Laboratory, Department of Surgery, Oncology and Gastroenterology, University of Padova (DiSCOG), Via Giustiniani 3, 35128 Padova, Italy; (E.B.); (A.P.)
- Orthopedics and Orthopedic Oncology, Department of Surgery, Oncology and Gastroenterology (DiSCOG), University of Padova, Via Giustiniani 3, 35128 Padova, Italy;
- Centre for Mechanics of Biological Materials, University of Padova, 35131 Padova, Italy; (V.M.); (A.P.); (R.B.-B.); (E.L.C.)
| | - Assunta Pozzuoli
- Musculoskeletal Pathology and Oncology Laboratory, Department of Surgery, Oncology and Gastroenterology, University of Padova (DiSCOG), Via Giustiniani 3, 35128 Padova, Italy; (E.B.); (A.P.)
- Orthopedics and Orthopedic Oncology, Department of Surgery, Oncology and Gastroenterology (DiSCOG), University of Padova, Via Giustiniani 3, 35128 Padova, Italy;
- Centre for Mechanics of Biological Materials, University of Padova, 35131 Padova, Italy; (V.M.); (A.P.); (R.B.-B.); (E.L.C.)
| | - Veronica Macchi
- Centre for Mechanics of Biological Materials, University of Padova, 35131 Padova, Italy; (V.M.); (A.P.); (R.B.-B.); (E.L.C.)
- Department of Neuroscience, Institute of Human Anatomy, University of Padova, 35121 Padova, Italy
- Veneto Region Reference Center for the Preservation and Use of Gifted Bodies, Veneto Region, 35100 Padua, Italy
| | - Andrea Porzionato
- Centre for Mechanics of Biological Materials, University of Padova, 35131 Padova, Italy; (V.M.); (A.P.); (R.B.-B.); (E.L.C.)
- Department of Neuroscience, Institute of Human Anatomy, University of Padova, 35121 Padova, Italy
- Veneto Region Reference Center for the Preservation and Use of Gifted Bodies, Veneto Region, 35100 Padua, Italy
| | - Rafael Boscolo-Berto
- Centre for Mechanics of Biological Materials, University of Padova, 35131 Padova, Italy; (V.M.); (A.P.); (R.B.-B.); (E.L.C.)
- Department of Neuroscience, Institute of Human Anatomy, University of Padova, 35121 Padova, Italy
- Veneto Region Reference Center for the Preservation and Use of Gifted Bodies, Veneto Region, 35100 Padua, Italy
| | - Pietro Ruggieri
- Orthopedics and Orthopedic Oncology, Department of Surgery, Oncology and Gastroenterology (DiSCOG), University of Padova, Via Giustiniani 3, 35128 Padova, Italy;
- Centre for Mechanics of Biological Materials, University of Padova, 35131 Padova, Italy; (V.M.); (A.P.); (R.B.-B.); (E.L.C.)
| | - Alice Berardo
- Department of Civil, Environmental and Architectural Engineering, University of Padova, 35131 Padova, Italy; (S.P.); (A.B.)
- Centre for Mechanics of Biological Materials, University of Padova, 35131 Padova, Italy; (V.M.); (A.P.); (R.B.-B.); (E.L.C.)
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | - Emanuele Luigi Carniel
- Centre for Mechanics of Biological Materials, University of Padova, 35131 Padova, Italy; (V.M.); (A.P.); (R.B.-B.); (E.L.C.)
- Department of Industrial Engineering, University of Padova, 35131 Padova, Italy
| | - Chiara Giulia Fontanella
- Centre for Mechanics of Biological Materials, University of Padova, 35131 Padova, Italy; (V.M.); (A.P.); (R.B.-B.); (E.L.C.)
- Department of Industrial Engineering, University of Padova, 35131 Padova, Italy
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