An Investigation of Structure, Flexibility and Function Variables that Discriminate Asymptomatic Foot Types

Shultz, Sarah P. and Song, Jinsup and Kraszewski, Andrew P. and Hafer, Jocelyn F. and Rao, Smita and Backus, Sherry and Mootanah, Rajshree and Hillstrom, Howard J. (2017) An Investigation of Structure, Flexibility and Function Variables that Discriminate Asymptomatic Foot Types. Journal of Applied Biomechanics, 33 (3). pp. 203-210. ISSN 1543-2688

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Official URL: http://doi.org/10.1123/jab.2016-0001

Abstract

It has been suggested that foot type considers not only foot structure (high, normal, low arch), but also function (overpronation, normal, oversupination) and flexibility (reduced, normal, excessive). Therefore, this study used canonical regression analyses to assess which variables of foot structure, function, and flexibility can accurately discriminate between clinical foot type classifications. The feet of 61 asymptomatic, healthy adults (18–77 years) were classified as cavus (N = 24), rectus (N = 54), or planus (N = 44) using standard clinical measures. Custom jigs assessed foot structure and flexibility. Foot function was assessed using an emed-x plantar pressure measuring device. Canonical regression analyses were applied separately to extract essential structure, flexibility, and function variables. A third canonical regression analysis was performed on the extracted variables to identify a combined model. The initial combined model included 30 extracted variables; however 5 terminal variables (malleolar valgus index, arch height index while sitting, first metatarsophalangeal joint laxity while standing, pressure-time integral and maximum contact area of medial arch) were able to correctly predict 80.7% of foot types. These remaining variables focused on specific foot characteristics (hindfoot alignment, arch height, midfoot mechanics, Windlass mechanism) that could be essential to discriminating foot type.

Item Type: Journal Article
Additional Information: Accepted author manuscript version reprinted, by permission, from 'Journal of Applied Biomechanics' 2016, http://doi.org/10.1123/jab.2016-0001. © Human Kinetics, Inc.
Keywords: clinical biomechanics, kinematics, musculoskeletal, foot structure
Faculty: Faculty of Science & Technology
Depositing User: Rajshree Hillstrom
Date Deposited: 25 Jan 2017 14:16
Last Modified: 28 Nov 2018 15:24
URI: http://arro.anglia.ac.uk/id/eprint/701393

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