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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...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Molecular Diversity Preservation International (MDPI)
2010
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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. |
format | Online Article Text |
id | pubmed-3231015 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2010 |
publisher | Molecular Diversity Preservation International (MDPI) |
record_format | MEDLINE/PubMed |
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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