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

Chatzistergos, Panagiotis E., ALLAN, David, CHOCKALINGAM, Nachiappan and NAEMI, Roozbeh (2022) Shore hardness is a more representative measurement of bulk tissue biomechanics than of skin biomechanics. Medical Engineering & Physics, 105. p. 103816. ISSN 13504533

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Abstract or description

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.

Item Type: Article
Uncontrolled Keywords: Plantar soft tissue, Skin, Subcutaneous tissue, Stiffness, Diabetic foot, Finite element, In vivo testing, Heel pad
Faculty: School of Life Sciences and Education > Sport and Exercise
Depositing User: Panagiotis CHATZISTERGOS
Date Deposited: 01 Jun 2022 14:51
Last Modified: 01 Mar 2023 16:09

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