Structural and Functional Characteristics of the Medial Longitudinal Arch

NewsBot · Jan 15, 2020

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Measuring Structural and Functional Characteristics of the Medial Longitudinal Arch: Building a Classification System
Sydney Schmidt
Master of Science Thesis; University of Alberta 2019

Historically, foot type has been classified on a single, linear continuum ranging from flat, to normal, to high,
with minimal distinction made between differences in the medial longitudinal arch (MLA) orientation in
different postures or tasks. Structural arch data has been recorded in various static positions, but functional
assessment typically relies on methodologies that are difficult to replicate en mass. Because of this, a
classification scheme that independently evaluates structural and functional foot arch characteristics using
a simple field tool is required. A mirror box unit was used to record images of participant’s footprints while
they were in a sitting, standing, and partial squat position in order to progressively deform the MLA.
Differences in Arch Index scores from the weighted (standing and partial squat) and unweighted (sitting)
position were used to determine MLA function. Observable changes between positions were detected,
indicating that functional arch type can be measured using quasi-static techniques. Accounting for both
structural and functional arch characteristics will allow practitioners to be more targeted when training or
treating individuals in the future. The methodology used in this study also showed that MLA deformation
is impacted by body position, thus requiring standardized protocols for future data collection if results are
to be considered comparable going forward.
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