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Improving goniometer accuracy by compensating for individual transducer characteristics

Sato, Tatiana de Oliveira; Cote Gil Coury, Helenice Jane and Hansson, Gert-Åke LU (2009) In Journal of Electromyography & Kinesiology 19(4). p.704-709
Abstract
Flexible goniometers are useful for direct movement measurements. Crosstalk due to rotation between the endblocks is well known. However, even without any rotation, some crosstalk can occur. The objective of this study was to elucidate the effect of, and compensate for, the inherent crosstalk in biaxial goniometers, with specific relevance for applications with one dominating movement direction. Six biaxial goniometers (M110, Biometrics Ltd., Gwent, UK) were evaluated. A precision jig, for simulating pure flexion/extension angles, was constructed. Each sensor produced a consistent and specific crosstalk pattern, when tested over a +/-100 degrees range of motion. A procedure for correction for the inherent crosstalk of individual... (More)
Flexible goniometers are useful for direct movement measurements. Crosstalk due to rotation between the endblocks is well known. However, even without any rotation, some crosstalk can occur. The objective of this study was to elucidate the effect of, and compensate for, the inherent crosstalk in biaxial goniometers, with specific relevance for applications with one dominating movement direction. Six biaxial goniometers (M110, Biometrics Ltd., Gwent, UK) were evaluated. A precision jig, for simulating pure flexion/extension angles, was constructed. Each sensor produced a consistent and specific crosstalk pattern, when tested over a +/-100 degrees range of motion. A procedure for correction for the inherent crosstalk of individual goniometer, based on polynomial adjust, is presented. The method for compensation, which reduced the root mean square error from, on average for the six goniometers, 3.7 degrees (range 1.8-10.1 degrees) to 0.35 degrees (0.12-0.55 degrees), might be required for obtaining valid goniometer measurements, e.g. of valgus/varus of the knee during gait flexion/extension movements. (C) 2008 Elsevier Ltd. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Crosstalk, Goniometer, Knee, Gait
in
Journal of Electromyography & Kinesiology
volume
19
issue
4
pages
704 - 709
publisher
Elsevier
external identifiers
  • wos:000267836000019
  • scopus:67349285694
ISSN
1873-5711
DOI
10.1016/j.jelekin.2008.01.006
language
English
LU publication?
yes
id
f99336cc-b213-4772-b04a-baed45818105 (old id 1462473)
date added to LUP
2009-08-31 11:03:17
date last changed
2017-01-01 04:52:53
@article{f99336cc-b213-4772-b04a-baed45818105,
  abstract     = {Flexible goniometers are useful for direct movement measurements. Crosstalk due to rotation between the endblocks is well known. However, even without any rotation, some crosstalk can occur. The objective of this study was to elucidate the effect of, and compensate for, the inherent crosstalk in biaxial goniometers, with specific relevance for applications with one dominating movement direction. Six biaxial goniometers (M110, Biometrics Ltd., Gwent, UK) were evaluated. A precision jig, for simulating pure flexion/extension angles, was constructed. Each sensor produced a consistent and specific crosstalk pattern, when tested over a +/-100 degrees range of motion. A procedure for correction for the inherent crosstalk of individual goniometer, based on polynomial adjust, is presented. The method for compensation, which reduced the root mean square error from, on average for the six goniometers, 3.7 degrees (range 1.8-10.1 degrees) to 0.35 degrees (0.12-0.55 degrees), might be required for obtaining valid goniometer measurements, e.g. of valgus/varus of the knee during gait flexion/extension movements. (C) 2008 Elsevier Ltd. All rights reserved.},
  author       = {Sato, Tatiana de Oliveira and Cote Gil Coury, Helenice Jane and Hansson, Gert-Åke},
  issn         = {1873-5711},
  keyword      = {Crosstalk,Goniometer,Knee,Gait},
  language     = {eng},
  number       = {4},
  pages        = {704--709},
  publisher    = {Elsevier},
  series       = {Journal of Electromyography & Kinesiology},
  title        = {Improving goniometer accuracy by compensating for individual transducer characteristics},
  url          = {http://dx.doi.org/10.1016/j.jelekin.2008.01.006},
  volume       = {19},
  year         = {2009},
}