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Within-day and between-day reliability of a FBG-based smart sock system for measuring active toe flexion displacement of the hallux

journal contribution
posted on 22.06.2021, 10:07 by Pui Wah Kong, Jing Wen Pan, Daniel FongDaniel Fong, Yixuan Leow, Yimin Liu, Chi Chiu Chan, Marabelle Li-Wen Heng
This study examined the test-retest reliability of hallux flexion displacement measured using a smart sock system with embedded fiber Bragg grating (FBG) sensors. Thirty female participants consisted of 15 hallux valgus (HV) patients and 15 control participants were recruited. Maximum active hallux flexion displacement was measured twice on each participant in the first visit; the same procedures were repeated 7 days later. Intraclass correlation coefficients (ICC2,1) and standard error of measurement (SEM) were applied to test within-day and between-day reliability. Paired-samples T-test was performed to compare the displacements between trials. Results showed almost perfect within-day reliability for both HV and control groups (ICC = .984 and .977, respectively) with small SEM (both 0.5 cm). However, fair to moderate between-day reliability was found (.323 and .438, respectively). Significant differences were found between repeated measurements taken on the same day (mean difference = 0.3 cm, p = .023) and on different days (mean difference = 1.6 cm, p = .027), though the effect size was small. The poorer between-day reliability is likely due to the inconsistency in fitting the sock onto the foot. Future optimization of the prototype design is called for to improve the fitting consistency of wearable sensors onto patients.

Funding

Singapore Ministry of Education Academic Research Fund Tier 1 grant [2015-T1-002-052]

Nanyang Technological University under the Undergraduate Research Experience on CAmpus (URECA) programme

History

School

  • Sport, Exercise and Health Sciences

Published in

Journal of Mechanics in Medicine and Biology

Volume

21

Issue

7

Publisher

World Scientific Publishing

Version

AM (Accepted Manuscript)

Rights holder

© World Scientific Publishing

Publisher statement

This paper was accepted for publication in the journal Journal of Mechanics in Medicine and Biology and the definitive published version is available at https://doi.org/10.1142/S0219519421500573.

Acceptance date

20/06/2021

Publication date

2021-09-09

Copyright date

2021

ISSN

0219-5194

eISSN

1793-6810

Language

en

Depositor

Dr Daniel Fong. Deposit date: 21 June 2021

Article number

2150057