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Gepubliceerd in: Journal of Foot and Ankle Research 1/2014

Open Access 01-04-2014 | Meeting abstract

A novel technique of quantifying first metatarsophalangeal (1stMPJ) joint stiffness

Auteurs: Marabelle L Heng, Pui W Kong

Gepubliceerd in: Journal of Foot and Ankle Research | bijlage 1/2014

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The first metatarsophalangeal joint (1st MPJ) mobility is usually described by (i) range of motion in degrees (°) or (ii) stiffness based on an experienced tester’s subjective feel, ie. hypermobile, normal or stiff. Approximately 65° of 1st MPJ dorsiflexion is required for normal effective walking [1]. Visual estimation of 1st MPJ range of motion is often used in current practice [2], reflecting the absence of a reliable and practical method for clinicians to quantify 1st MPJ stiffness. This study presents a novel technique to measure joint stiffness using a tactile pressure sensing system (Figure 1A) together with simple video analysis.
To illustrate the method, data were collected on one female flat-footed subject with posterior tibial tendon dysfunction (age 25 yr, body mass index 20.6 kg/m2). The moment arm was measured from the tuberosity of the first metatarsal head to just beneath the tuberosity of the 1st distal phalanx (Figure 1B). A qualified podiatrist moved the 1st MPJ of the subject through its full range of motion before data collection. For each trial, joint movement is paused briefly at 3 interval points between the resting and maximally dorsiflexed position. At each interval point, the corresponding force applied was measured using a tactile pressure sensing system (Figure 1C). The procedures were recorded by a synchronised webcam such that the angular displacement of the 1st MPJ can be quantified using video analysis. A total of 3 trials were taken, resulting in nine sets of data points to plot a torque-angular displacement graph (Figure 2). The joint stiffness was then calculated as the slope of the line of best fit as 3.8 Nmm/deg. The R2 indicates that 61% of variability can be explained by this model.
The proposed method of quantifying 1st MPJ stiffness is potentially useful for measuring small joint stiffness in clinical practice. Quantified joint stiffness provides greater accuracy to facilitate clinicians in their diagnoses and prescription of treatment.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://​creativecommons.​org/​licenses/​by/​4.​0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://​creativecommons.​org/​publicdomain/​zero/​1.​0/​) applies to the data made available in this article, unless otherwise stated.
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Literatuur
1.
go back to reference Hopson MM, McPoil TG, Cornwall MW: Motion of the first metatarsophalangeal joint. Reliability and validity of four measurement techniques. Journal of the American Podiatric Medical Association. 1995, 85 (4): 198-204.CrossRefPubMed Hopson MM, McPoil TG, Cornwall MW: Motion of the first metatarsophalangeal joint. Reliability and validity of four measurement techniques. Journal of the American Podiatric Medical Association. 1995, 85 (4): 198-204.CrossRefPubMed
2.
go back to reference Jones AM, Curran SA: Intrarater and interrater reliability of first metatarsophalangeal joint dorsiflexion. Goniometry versus visual estimation. Journal of the American Podiatric Medical Association. 2012, 102 (4): 290-298.CrossRefPubMed Jones AM, Curran SA: Intrarater and interrater reliability of first metatarsophalangeal joint dorsiflexion. Goniometry versus visual estimation. Journal of the American Podiatric Medical Association. 2012, 102 (4): 290-298.CrossRefPubMed
Metagegevens
Titel
A novel technique of quantifying first metatarsophalangeal (1stMPJ) joint stiffness
Auteurs
Marabelle L Heng
Pui W Kong
Publicatiedatum
01-04-2014
Uitgeverij
BioMed Central
Gepubliceerd in
Journal of Foot and Ankle Research / Uitgave bijlage 1/2014
Elektronisch ISSN: 1757-1146
DOI
https://doi.org/10.1186/1757-1146-7-S1-A32

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