Repeatability of subject/bed interface pressure measurements

Allen, Vincent; Ryan, Dene E.; Murray, Alan

doi:10.1016/0141-5425(93)90011-m

Cited by 29 publications

(19 citation statements)

References 11 publications

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“…underneath the ischial tuberosity, reaching a value of 2 120 kPa. This magnitude is within the range of interface pressures commonly measured for people sitting on hard surfaces [25,31,32]. The stress reduces to zero at the point where buttock and cushion no longer make contact, i.e.…”

Section: Resultssupporting

confidence: 49%

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: Resultssupporting

confidence: 49%

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

View full text Add to dashboard Cite

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“…Interface pressure measurements in patients to predict pressure sore risk were previously claimed to be inaccurate and irrepeatable (Allen et al, 1993;Sprigle et al, 2003). Using a novel MRI-based method of quantification of sub-dermal tissue strains and stresses in sitting human subjects, in vivo, we indicate here that interface-sitting pressures are very problematic as a measure for the risk of DTI.…”

Section: Discussionmentioning

confidence: 89%

Assessment of mechanical conditions in sub-dermal tissues during sitting: A combined experimental-MRI and finite element approach

Linder-Ganz

Shabshin

Itzchak

et al. 2007

Journal of Biomechanics

278

228

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“…Several measurement points are needed, as the pressure over a small area can be highly variable (LE et aL, 1984), and low interface pressure at one anatomical site does not exclude a much higher interface pressure at other sites (ALLEN et aL, 1993b;1994;CLARK, 1994). If a single sensor is used, it has to be moved between measurements to obtain the pressure levels under several bony prominences, which could physiologically stress the tissue and the person.…”

Section: Interface Pressure and Shear Forcesmentioning

confidence: 99%

“…Tissue compliance has an effect on the size of the contact area (ALLEN et al, 1993b). Pressure measurement can be made with a single pressure sensor or with a pressure sensitive mat.…”

Section: Interface Pressure and Shear Forcesmentioning

confidence: 99%

Evaluation of antidecubitus mattresses

Jönsson

Lindén

Lindgren

et al. 2005

Med. Biol. Eng. Comput.

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Pressure sores are a current problem in hospitals and care of the elderly, leading to protracted hospital stays and a high care burden. The trauma for the patients is severe, and the cost of pressure sore prevention and treatment, is considerable. Antidecubitus mattresses are used for prevention and in treatment, but they also contribute to the cost of treating pressure sores. The problem highlighted in the review is that the mattresses' effectiveness in preventing and treating pressure sores has not been sufficiently evaluated. When antidecubitus mattresses are evaluated, it is often only with regard to aspects of the interface pressure and the mattresses' ability to redistribute the pressure. The review points out the important observation that, to be able to evaluate the efficacy of the antidecubitus mattress, the mattress's effect on tissue viability needs to be studied. The parameters that ought to be considered when evaluating a support surface are: interface pressure, pressure and blood flow distribution, temperature and humidity in the skin-support surface interface. The authors propose that the effect on tissue viability of external loading can be assessed by simultaneous measurement of the interface pressure and tissue perfusion.

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Repeatability of subject/bed interface pressure measurements

Cited by 29 publications

References 11 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?

Assessment of mechanical conditions in sub-dermal tissues during sitting: A combined experimental-MRI and finite element approach

Evaluation of antidecubitus mattresses

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