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Arch indexes from ink footprints and pressure platforms are different

Urry, Stephen R. & Wearing, Scott C. (2005) Arch indexes from ink footprints and pressure platforms are different. The Foot, 15(2), pp. 68-73.

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Abstract

Background: Footprints from force sensitive resistor (FSR) type pressure platforms have been shown to differ from ink prints, leading to a relative distortion of the arch index (AI). Objective: To compare the accuracy of the AI derived from a capacitance pressure platform relative to ink footprints. Method: Area measurements (heel, midfoot, forefoot, hallux and lesser toes) were acquired simultaneously from ink footprints and a pressure platform. Difference between paired values revealed relative measurement error. Results: The platform overestimated heel area (2.2%), but underestimated midfoot area (10.2%), and lesser toe area (17.7 %). The mean AIs were 0.206 (platform) and 0.230 (ink prints). Conclusions: The pressure platform closely estimated contact areas for the heel and forefoot. Midfoot areas were underestimated sufficiently to bias the AI towards lower values. Therefore, the AI derived from a capacitance pressure platform is not the same as that from an ink footprint, and the two should not be used interchangeably. Feet classified according to AI from a pressure platform may be categorised differently than they would by using ink footprints. Pressure platform data cannot be used to determine AI with confidence until relative measurement error for isolated foot regions has been determined, or appropriate normative values established.

Impact and interest:

9 citations in Scopus
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ID Code: 10560
Item Type: Journal Article
Additional Information: For more information, please refer to the journal’s website (see hypertext link) or contact the author.
Keywords: Footprint, Arch index, Pressure platform, Contact area, Long plantar angle
DOI: 10.1016/j.foot.2005.02.001
ISSN: 0958-2592
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > CLINICAL SCIENCES (110300) > Podiatry (110318)
Divisions: Current > Research Centres > Centre for Health Research
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2005 Elsevier
Deposited On: 02 Nov 2007
Last Modified: 29 Feb 2012 23:15

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