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Biomechanics and Modeling in Mechanobiology

, Volume 17, Issue 5, pp 1373–1388 | Cite as

Region-specific constitutive modeling of the plantar soft tissue

  • Haihua Ou
  • Peng Zhan
  • Liping Kang
  • Jialiang Su
  • Xiaodong Hu
  • Shane Johnson
Original Paper
  • 61 Downloads

Abstract

Recent research has shown that hyperelastic properties of the plantar soft tissue consisting of adipose tissue and fibrous septa change from region to region. However, relatively little research has been conducted to develop analytical or computational models to describe the region-specific behavior of the plantar soft tissue. The objective of the research is to develop a region-specific constitutive model of the plantar soft tissue. Plantar soft tissue specimens were dissected from six regions [subcalcaneal (CA), sublateral (LA), subnavicular (Nav), 1st, 3rd, and 5th submetatarsal (M1, M3, M5)] from cadaveric foot samples, and a picrosirius red staining technique was used to visualize the collagen fibers in fibrous septa. The volume fractions of adipose tissue and fibrous septa and the volume fractions of the principal orientations of the fibrous septa were calculated with the intensity gradient method. Region-specific constitutive models were then developed in finite element analysis considering the microstructure of the plantar soft tissue. The hyperelastic region specific material properties of the plantar soft tissue were validated with experimental unconfined compression tests and indentation tests from the literature. The results show that the models give reasonable predictions of the stiffness of the soft tissue within a standard deviation of the tests. The region-specific constitutive models help to explain how changes in the constituents are related to mechanical behavior of the soft tissue on a region specific basis.

Keywords

Foot and ankle Constitutive region specific Finite element analysis Plantar soft tissue Microstructure Collagen fibers 

Notes

Acknowledgements

This study was funded by National Nature Science Foundation of China under Grant Nos. 51505282 and 51550110233.

Compliance with ethical standards

Conflict of interest

The authors have no conflicts to report.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Haihua Ou
    • 1
  • Peng Zhan
    • 1
  • Liping Kang
    • 1
  • Jialiang Su
    • 1
  • Xiaodong Hu
    • 3
  • Shane Johnson
    • 1
    • 2
  1. 1.University of Michigan and Shanghai Jiao Tong University Joint InstituteShanghai Jiao Tong UniversityShanghaiChina
  2. 2.State Key Laboratory of Mechanical Systems and VibrationShanghai Jiao Tong UniversityShanghaiChina
  3. 3.Department of Human Anatomy, Histology and EmbryologyShanghai Jiao Tong UniversityShanghaiChina

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