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This article is part of the supplement: Proceedings of the Society of Chiropodists and Podiatrists Annual Conference 2010

Open Access Poster presentation

Within-subject foot motion variability in patients with Rheumatoid Arthritis

Lindsey Hooper1*, Lucy Gates1, Lyndsey Goulston1, Cathy Bowen1, Christopher Edwards1 and Nigel Arden2

  • * Corresponding author: Lindsey Hooper

Author Affiliations

1 University of Southampton, Southampton, UK

2 University of Oxford, Oxford, UK

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Journal of Foot and Ankle Research 2010, 3(Suppl 1):P7  doi:10.1186/1757-1146-3-S1-P7


The electronic version of this article is the complete one and can be found online at: http://www.jfootankleres.com/content/3/S1/P7


Published:20 December 2010

© 2010 Hooper et al; licensee BioMed Central Ltd.

This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Introduction

Multi-segment three-dimensional analysis is a complex yet rapidly evolving methodology in podiatric mechanical research. The purpose of this study was to explore the within-subject foot motion variability (MoVa) during the stance phase of gait.

Methods

A 3D motion analysis system was used to collect gait data for 5 healthy participants and 5 patients with RA. The oxford foot model was used to characterise dynamic foot & ankle kinematics and spatio-temporal parameters. Inter-segmental motions of interest were defined as tibia-rearfoot and rearfoot-forefoot. The main outcome of interest was within-subject MoVa, expressed as mean standard deviation (SD).

Results

MoVa ranged from 0.94- 2.33SD and was similar for both groups. Increased MoVa was largely accounted for by rearfoot variance. There is a trend towards increased forefoot MoVa in the RA group (RA 0.65-1.78, Control 0.34-0.9). No single episode during the stance phase had greater variability than any other.

Discussion

MoVa rather than a particular gait event may be an alternative outcome warranting further investigation. These results suggest care should be taken when assuming mean within-subject MoVa in mechanical analyses. This preliminary work suggests that greater forefoot MoVa may occur in RA participants. This pilot investigation provides useful preliminary data to inform future studies.