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Goniometer Crosstalk Compensation for Knee Joint Applications

Sato, Tatiana de Oliveira; Hansson, Gert-Åke LU and Cote Gil Coury, Helenice Jane (2010) In Sensors 10(11). p.9994-10005
Abstract
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 degrees flexion/extension movements. A goniometer was mounted with various degrees of valgus/varus (+/- 20 degrees) and rotation (+/- 30 degrees) misalignments. For valgus/varus misalignments, although offset compensation eliminated the error in the valgus/varus recordings for 0 degrees of flexion/extension and reduced it to a few degrees for small (+/- 30 degrees)... (More)
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 degrees flexion/extension movements. A goniometer was mounted with various degrees of valgus/varus (+/- 20 degrees) and rotation (+/- 30 degrees) misalignments. For valgus/varus misalignments, although offset compensation eliminated the error in the valgus/varus recordings for 0 degrees of flexion/extension and reduced it to a few degrees for small (+/- 30 degrees) flexion/extension angles (root mean square error = 1.1 degrees), the individual crosstalk caused pronounced errors for large (+/- 100 degrees) angles (18.8 degrees). Subsequent compensation for this crosstalk reduced these errors to 0.8 degrees and 4.5 degrees, 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 degrees) and large (+/- 100 degrees) flexion/extension angles from 3.6 degrees to 0.5 degrees and from 15.5 degrees to 2.4 degrees, 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. (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
movement, knee, gait, measurement errors
in
Sensors
volume
10
issue
11
pages
9994 - 10005
publisher
MDPI AG
external identifiers
  • wos:000284578200028
  • scopus:84871061329
ISSN
1424-8220
DOI
10.3390/s101109994
language
English
LU publication?
yes
id
025d72c9-8791-4438-9645-cb83b0529cb5 (old id 1752025)
date added to LUP
2011-01-04 08:04:49
date last changed
2018-06-10 04:12:07
@article{025d72c9-8791-4438-9645-cb83b0529cb5,
  abstract     = {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 degrees flexion/extension movements. A goniometer was mounted with various degrees of valgus/varus (+/- 20 degrees) and rotation (+/- 30 degrees) misalignments. For valgus/varus misalignments, although offset compensation eliminated the error in the valgus/varus recordings for 0 degrees of flexion/extension and reduced it to a few degrees for small (+/- 30 degrees) flexion/extension angles (root mean square error = 1.1 degrees), the individual crosstalk caused pronounced errors for large (+/- 100 degrees) angles (18.8 degrees). Subsequent compensation for this crosstalk reduced these errors to 0.8 degrees and 4.5 degrees, 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 degrees) and large (+/- 100 degrees) flexion/extension angles from 3.6 degrees to 0.5 degrees and from 15.5 degrees to 2.4 degrees, 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.},
  author       = {Sato, Tatiana de Oliveira and Hansson, Gert-Åke and Cote Gil Coury, Helenice Jane},
  issn         = {1424-8220},
  keyword      = {movement,knee,gait,measurement errors},
  language     = {eng},
  number       = {11},
  pages        = {9994--10005},
  publisher    = {MDPI AG},
  series       = {Sensors},
  title        = {Goniometer Crosstalk Compensation for Knee Joint Applications},
  url          = {http://dx.doi.org/10.3390/s101109994},
  volume       = {10},
  year         = {2010},
}