Characterisation of Anisotropic and Non-linear Behaviour of Human Skin<i>In Vivo</i>

Meijer, Riske; Douven, Lfa Lucien; Oomens, Cwj Cees

doi:10.1080/10255849908907975

Cited by 56 publications

(32 citation statements)

References 8 publications

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“…The bottleneck still is to determine the material properties for skin, fat and muscle, but also in this area many interesting tools have been developed in the recent past. The development of numerical/experimental methods has been formed basis of a number of in-vivo techniques to determine material properties of biological tissues [35,36] and has been recently used to measure in-vivo transverse mechanical properties of skeletal muscle [26]. Validation of the models is possible using MRI and/or MRI-tagging techniques [29,30].…”

Section: Discussionmentioning

confidence: 99%

Can Loaded Interface Characteristics Influence Strain Distributions in Muscle Adjacent to Bony Prominences?

Oomens

Bressers

Bosboom

et al. 2003

Computer Methods in Biomechanics and Biomedical Engineering

162

130

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Pressure distributions at the interface between skin and supporting tissues are used in design of supporting surfaces like beds, wheel chairs, prostheses and in sales brochures to support commercial products. The reasoning behind this is, that equal pressure distributions in the absence of high pressure gradients is assumed to minimise the risk of developing pressure sores. Notwithstanding the difficulty in performing reproducible and accurate pressure measurements, the question arises if the interface pressure distribution is representative of the internal mechanical state of the soft tissues involved.The paper describes a study of the mechanical condition of a supported buttock contact, depending on cushion properties, relative properties of tissue layers and friction. Numerical, mechanical simulations of a buttock on a supporting cushion are described. The ischial tuberosity is modelled as a rigid body, whereas the overlying muscle, fat and skin layers are modelled as a non-linear Ogden material. Material parameters and thickness of the fat layer are varied. Coulomb friction between buttock and cushion is modelled with different values of the friction coefficient. Moreover, the thickness and properties of the cushion are varied.High shear strains are found in the muscle near the bony prominence and the fat layer near the symmetry line. The performed parameter variations lead to large differences in shear strain in the fat layer but relatively small variations in the skeletal muscle. Even with a soft cushion, leading to a high reduction of the interface pressure the deformation of the skeletal muscle near the bone is high enough to form a risk, which is a clear argument that interface pressures alone are not sufficient to evaluate supporting surfaces.

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Section: Discussionmentioning

confidence: 99%

Can Loaded Interface Characteristics Influence Strain Distributions in Muscle Adjacent to Bony Prominences?

Oomens

Bressers

Bosboom

et al. 2003

Computer Methods in Biomechanics and Biomedical Engineering

162

130

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“…The test conditions were as follows: (1) indentation speed fixed at 1.0 mm/s, with an indentor area of 1.0 cm 2 with chamfered edges to minimize any edge effects; (2) loading followed by unloading when the subject pressed the pain button (this process helped ensure subject safety); (3) to minimize foot skeletal motion and the corresponding effects changes of the test locations (such as the metatarsal bones) during the indentation procedure [4], subject constrained to a natural, standing posture with half the body weight on each foot; (4) similar to many previous studies [33][34], test was conducted with no preconditioning trials, because this represents the state of tissue at clinical intervention [35]. Lack of preconditioning also helps to minimize subject fatigue and sensitization or adaptation due to repeated pressure stimuli [36][37].…”

Section: Test On Footmentioning

confidence: 99%

An indentation apparatus for evaluating discomfort and pain thresholds in conjunction with mechanical properties of foot tissue in vivo

Xiong

Goonetilleke²,

Witana³

et al. 2010

JRRD

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Abstract-The mechanical properties of human foot tissue in vivo as well as discomfort and pain thresholds are important for various applications. In this study, an apparatus for measuring the discomfort and pain thresholds and the mechanical properties of human tissues is presented. The apparatus employs a stepper motor that controls the indentation speed, as well as a load cell and potentiometer that determine the corresponding reaction force and tissue deformation (displacement), respectively. A LabVIEW program (LabVIEW 8, National Instruments Corporation; Austin, Texas) was developed to control the indentation via a data acquisition card. The apparatus can accommodate indentor displacements up to 35 mm and can impart forces up to 150 N at a controlled indentation speed in the range of 0 to 10 mm/s. Tests showed that the displacement measurement error is 0.17 mm in the nominal range (0.5% in the full scale) and the measurement error of force is 1.6 N in the nominal range (1.1% in the full scale). Experimental results indicate that the apparatus is reliable and flexible for measuring the mechanical properties of foot tissue in vivo in conjunction with pain and discomfort thresholds.

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“…Although Lanir [93] did not identify its model with experimental data, Meijer et al [94] exploited it by characterizing in-plane mechanical properties of human forearm skin using an hybrid numerical-experimental approach. Collagen fibre stiffness and mean undulation were estimated from the physical tests while the other constitutive parameters were extracted from the literature.…”

Section: (I) Lanir's Modelmentioning

confidence: 99%

Mathematical and computational modelling of skin biophysics: a review

Limbert

2017

Proc. R. Soc. A.

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The objective of this paper is to provide a review on some aspects of the mathematical and computational modelling of skin biophysics, with special focus on constitutive theories based on nonlinear continuum mechanics from elasticity, through anelasticity, including growth, to thermoelasticity. Microstructural and phenomenological approaches combining imaging techniques are also discussed. Finally, recent research applications on skin wrinkles will be presented to highlight the potential of physics-based modelling of skin in tackling global challenges such as ageing of the population and the associated skin degradation, diseases and traumas.

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Characterisation of Anisotropic and Non-linear Behaviour of Human SkinIn Vivo

Cited by 56 publications

References 8 publications

Can Loaded Interface Characteristics Influence Strain Distributions in Muscle Adjacent to Bony Prominences?

Can Loaded Interface Characteristics Influence Strain Distributions in Muscle Adjacent to Bony Prominences?

An indentation apparatus for evaluating discomfort and pain thresholds in conjunction with mechanical properties of foot tissue in vivo

Mathematical and computational modelling of skin biophysics: a review

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