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Goniometer Crosstalk Compensation for Knee Joint Applications

Electrogoniometers are prone to crosstalk errors related to endblocks rotation (general crosstalk) and to the characteristics of each sensor (individual crosstalk). The aim of this study was to assess the crosstalk errors due to endblock misalignments and to propose a procedure to compensate for the...

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Autores principales: de Oliveira Sato, Tatiana, Hansson, Gert-Åke, Coury, Helenice Jane Cote Gil
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Molecular Diversity Preservation International (MDPI) 2010
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3231015/
https://www.ncbi.nlm.nih.gov/pubmed/22163452
http://dx.doi.org/10.3390/s101109994
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author de Oliveira Sato, Tatiana
Hansson, Gert-Åke
Coury, Helenice Jane Cote Gil
author_facet de Oliveira Sato, Tatiana
Hansson, Gert-Åke
Coury, Helenice Jane Cote Gil
author_sort de Oliveira Sato, Tatiana
collection PubMed
description Electrogoniometers are prone to crosstalk errors related to endblocks rotation (general crosstalk) and to the characteristics of each sensor (individual crosstalk). The aim of this study was to assess the crosstalk errors due to endblock misalignments and to propose a procedure to compensate for these errors in knee applications. A precision jig was used to simulate pure ±100° flexion/extension movements. A goniometer was mounted with various degrees of valgus/varus (±20°) and rotation (±30°) misalignments. For valgus/varus misalignments, although offset compensation eliminated the error in the valgus/varus recordings for 0° of flexion/extension and reduced it to a few degrees for small (±30°) flexion/extension angles (root mean square error = 1.1°), the individual crosstalk caused pronounced errors for large (±100°) angles (18.8°). Subsequent compensation for this crosstalk reduced these errors to 0.8° and 4.5°, respectively. For rotational misalignment, compensation for the general crosstalk by means of coordinate system rotation, in combination with compensation for the individual crosstalk, reduced the errors for small (±30°) and large (±100°) flexion/extension angles from 3.6° to 0.5° and from 15.5° to 2.4°, respectively. Crosstalk errors were efficiently compensated by the procedures applied, which might be useful in preprocessing of knee functional data, thereby substantially improving goniometer accuracy.
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spelling pubmed-32310152011-12-07 Goniometer Crosstalk Compensation for Knee Joint Applications de Oliveira Sato, Tatiana Hansson, Gert-Åke Coury, Helenice Jane Cote Gil Sensors (Basel) Article Electrogoniometers are prone to crosstalk errors related to endblocks rotation (general crosstalk) and to the characteristics of each sensor (individual crosstalk). The aim of this study was to assess the crosstalk errors due to endblock misalignments and to propose a procedure to compensate for these errors in knee applications. A precision jig was used to simulate pure ±100° flexion/extension movements. A goniometer was mounted with various degrees of valgus/varus (±20°) and rotation (±30°) misalignments. For valgus/varus misalignments, although offset compensation eliminated the error in the valgus/varus recordings for 0° of flexion/extension and reduced it to a few degrees for small (±30°) flexion/extension angles (root mean square error = 1.1°), the individual crosstalk caused pronounced errors for large (±100°) angles (18.8°). Subsequent compensation for this crosstalk reduced these errors to 0.8° and 4.5°, respectively. For rotational misalignment, compensation for the general crosstalk by means of coordinate system rotation, in combination with compensation for the individual crosstalk, reduced the errors for small (±30°) and large (±100°) flexion/extension angles from 3.6° to 0.5° and from 15.5° to 2.4°, respectively. Crosstalk errors were efficiently compensated by the procedures applied, which might be useful in preprocessing of knee functional data, thereby substantially improving goniometer accuracy. Molecular Diversity Preservation International (MDPI) 2010-11-09 /pmc/articles/PMC3231015/ /pubmed/22163452 http://dx.doi.org/10.3390/s101109994 Text en © 2010 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/. (http://creativecommons.org/licenses/by/3.0/) )
spellingShingle Article
de Oliveira Sato, Tatiana
Hansson, Gert-Åke
Coury, Helenice Jane Cote Gil
Goniometer Crosstalk Compensation for Knee Joint Applications
title Goniometer Crosstalk Compensation for Knee Joint Applications
title_full Goniometer Crosstalk Compensation for Knee Joint Applications
title_fullStr Goniometer Crosstalk Compensation for Knee Joint Applications
title_full_unstemmed Goniometer Crosstalk Compensation for Knee Joint Applications
title_short Goniometer Crosstalk Compensation for Knee Joint Applications
title_sort goniometer crosstalk compensation for knee joint applications
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3231015/
https://www.ncbi.nlm.nih.gov/pubmed/22163452
http://dx.doi.org/10.3390/s101109994
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