Shore hardness is a more representative measurement of bulk tissue biomechanics than of skin biomechanics.

P.E. Chatzistergos, D. Allan, N. Chockalingam, R. Naemi

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Abstract

To support the effective use of Shore hardness (SH) in research and clinical practice this study investigates whether SH should be interpreted as a measurement of skin or of bulk tissue biomechanics. A 3D finite element model of the heel and a validated model of a Shore-00 durometer were used to simulate testing for different combinations of stiffness and thickness in the skin and subcutaneous tissue. The results of this numerical analysis showed that SH is significantly more sensitive to changes in skin thickness, relatively to subcutaneous tissue, but equally sensitive to changes in the stiffness of either tissue. Indicatively, 25% reduction in skin thickness (0.3 mm thickness change) or in subcutaneous tissue thickness (5.9 mm thickness change), reduced SH by 7% or increased SH by 2% respectively. At the same time, 25% reduction in skin stiffness (10.1 MPa change in initial shear modulus) or of subcutaneous tissue (4.1 MPa change in initial shear modulus) led to 11% or 8% reduction in SH respectively. In the literature, SH is commonly used to study skin biomechanics. However, this analysis indicates that SH quantifies the deformability of bulk tissue, not of skin. Measurements of skin thickness are also necessary for the correct interpretation of SH.

Original languageEnglish
Article number103816
JournalMedical Engineering and Physics
Volume105
Early online date7 May 2022
DOIs
Publication statusPublished (in print/issue) - 1 Jul 2022

Bibliographical note

Copyright © 2022 The Author(s). Published by Elsevier Ltd.. All rights reserved.

Keywords

  • Diabetic foot
  • Finite element
  • Heel pad
  • In vivo testing
  • Plantar soft tissue
  • Skin
  • Stiffness
  • Subcutaneous tissue

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