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Fiber Bragg grating sensors for clinical measurement of the first metatarsophalangeal joint quasi-stiffness

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posted on 2019-10-10, 13:18 authored by Pui Wah Kong, Chi Chiu Chan, Marabelle Li-wen Heng, Yimin Liu, Yixuan Leow, Daniel FongDaniel Fong
Assessing the mobility of the first metatarsophalangeal joint (MTPJ) of a human foot is useful in clinical practice but there are no standard methods of measurement. The present study developed a new instrumentation using Fiber Bragg grating (FBG) sensor and load cell to quantify the first MTPJ quasi-stiffness in a clinical setting. This system is portable, lightweight, and allows quantification of quasi-stiffness over different ranges of motion in both loading and unloading directions. The laboratory setting validation results showed that FBG sensors could measure MTPJ angular displacement with reasonably good accuracy. The proposed system was successfully trialed in a hospital setting operated by a clinician on eight human subjects. Non-linear torque-angular displacement relationship was observed in both loading and unloading phases, with varying MTPJ quasi-stiffness in the early [loading 6.30 (2.62) Nmm/o unloading 8.46 (2.29) Nmm/ o], middle [loading 7.13 (2.17) Nmm/ o, unloading 11.11 (2.94) Nmm/ o], and late [loading 24.54 (7.14) Nmm/ o, unloading 14.50 (4.77) Nmm/ o] ranges of motion. The new method for measuring the first MTPJ quasi-stiffness established in the present study serves as a reference and opens up opportunities for future clinical investigations.

Funding

Singapore Ministry of Education Academic Research Fund, Tier 1 Grant

History

School

  • Sport, Exercise and Health Sciences

Published in

IEEE Sensors Journal

Volume

20

Issue

3

Pages

1322 - 1328

Publisher

Institute of Electrical and Electronics Engineers

Version

  • AM (Accepted Manuscript)

Rights holder

© IEEE

Publisher statement

© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Acceptance date

2019-09-17

Publication date

2019-10-10

Copyright date

2020

ISSN

1530-437X

eISSN

1558-1748

Language

  • en

Depositor

Dr Daniel Fong

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