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Journal of the American Podiatric Medical Association Volume 91 Number 4 203-209 2001
Copyright © 2001 American Podiatric Medical Association

A Comparison of Footprint Indexes Calculated from Ink and Electronic Footprints

Stephen R. Urry, DPodM* and Scott C. Wearing, BHMS, BAppSc{dagger}

* Fellow, Society of Chiropodists and Podiatrists (UK); Lecturer, School of Public Health, Queensland University of Technology, Kelvin Grove, Queensland 4059, Australia.
{dagger} Submitted during doctoral studies, Centre for Public Health Research, School of Public Health, Queensland University of Technology, Kelvin Grove, Queensland.

Abstract

Pressure platforms offer the potential to measure and record electronic footprints rapidly; however, the accuracy of geometric indexes derived from these prints has not been investigated. A comparison of conventional ink footprints with simultaneously acquired electronic prints revealed significant differences in several geometric indexes. The contact area was consistently underestimated by the electronic prints and resulted in a significant change in the arch index. The long plantar angle was poorly correlated between techniques. This study demonstrated that electronic footprints, derived from a pressure platform, are not representative of the equivalent ink footprints and, consequently, should not be interpreted with reference to literature on conventional footprints. (J Am Podiatr Med Assoc 91(4): 203-209, 2001)




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