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Reliability and validity of the INFOOT three-dimensional foot digitizer for patients with rheumatoid arthritis

Sophie De Mits UGent, Pascal Coorevits UGent, Dirk De Clercq UGent, Dirk Elewaut UGent, James Woodburn and Philip Roosen UGent (2011) JOURNAL OF THE AMERICAN PODIATRIC MEDICAL ASSOCIATION. 101(3). p.198-207
abstract
Background: Abnormal foot posture and deformities are identified as important features in rheumatoid arthritis. There is still no consensus regarding the optimum technique(s) for quantifying these features; hence, a foot digitizer might be used as an objective measurement tool. We sought to assess the validity and reliability of the INFOOT digitizer. Methods: To investigate the validity of the INFOOT digitizer compared with clinical measurements, we calculated Pearson correlation coefficients. To investigate the reliability of the INFOOT digitizer, we calculated intraclass correlation coefficients, SEMs, smallest detectable differences, and smallest detectable difference percentages. Results: Most of the 38 parameters showed good intraclass correlation coefficients, with values greater than 0.9 for 30 parameters and greater than 0.8 for seven parameters. The left heel bone angle expressed a moderate correlation, with a value of 0.609. The SEM values varied between 0.31 and 3.51 mm for the length and width measures, between 0.74 and 5.58 mm for the height data, between 0.75 and 5.9 mm for the circumferences, and between 0.78 degrees and 2.98 degrees for the angles. The smallest detectable difference values ranged from 0.86 to 16.36 mm for length, width, height, and circumference measures and from 2.17 degrees to 8.26 degrees for the angle measures. For the validity of the INFOOT three-dimensional foot digitizer, Pearson correlation coefficients varied between 0.750 and 0.997. Conclusions: In this rheumatoid arthritis population, good validity was demonstrated compared with clinical measurements, and most of the obtained parameters proved to be reliable. (J Am Podiatr Med Assoc 101(3): 198-207, 2011)
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
QUALITY, ANKLE, TEST-RETEST RELIABILITY, SHAPE, INDEX
journal title
JOURNAL OF THE AMERICAN PODIATRIC MEDICAL ASSOCIATION
J. Am. Podiatr. Med. Assoc.
volume
101
issue
3
pages
198 - 207
Web of Science type
Article
Web of Science id
000290825900001
JCR category
ORTHOPEDICS
JCR impact factor
0.567 (2011)
JCR rank
48/63 (2011)
JCR quartile
4 (2011)
ISSN
8750-7315
project
Ghent researchers on unfolded proteins in inflammatory disease (GROUP-ID)
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1319056
handle
http://hdl.handle.net/1854/LU-1319056
date created
2011-06-22 15:31:50
date last changed
2013-02-27 09:09:31
@article{1319056,
  abstract     = {Background: Abnormal foot posture and deformities are identified as important features in rheumatoid arthritis. There is still no consensus regarding the optimum technique(s) for quantifying these features; hence, a foot digitizer might be used as an objective measurement tool. We sought to assess the validity and reliability of the INFOOT digitizer. Methods: To investigate the validity of the INFOOT digitizer compared with clinical measurements, we calculated Pearson correlation coefficients. To investigate the reliability of the INFOOT digitizer, we calculated intraclass correlation coefficients, SEMs, smallest detectable differences, and smallest detectable difference percentages. Results: Most of the 38 parameters showed good intraclass correlation coefficients, with values greater than 0.9 for 30 parameters and greater than 0.8 for seven parameters. The left heel bone angle expressed a moderate correlation, with a value of 0.609. The SEM values varied between 0.31 and 3.51 mm for the length and width measures, between 0.74 and 5.58 mm for the height data, between 0.75 and 5.9 mm for the circumferences, and between 0.78 degrees and 2.98 degrees for the angles. The smallest detectable difference values ranged from 0.86 to 16.36 mm for length, width, height, and circumference measures and from 2.17 degrees to 8.26 degrees for the angle measures. For the validity of the INFOOT three-dimensional foot digitizer, Pearson correlation coefficients varied between 0.750 and 0.997. Conclusions: In this rheumatoid arthritis population, good validity was demonstrated compared with clinical measurements, and most of the obtained parameters proved to be reliable. (J Am Podiatr Med Assoc 101(3): 198-207, 2011)},
  author       = {De Mits, Sophie and Coorevits, Pascal and De Clercq, Dirk and Elewaut, Dirk and Woodburn, James and Roosen, Philip},
  issn         = {8750-7315},
  journal      = {JOURNAL OF THE AMERICAN PODIATRIC MEDICAL ASSOCIATION},
  keyword      = {QUALITY,ANKLE,TEST-RETEST RELIABILITY,SHAPE,INDEX},
  language     = {eng},
  number       = {3},
  pages        = {198--207},
  title        = {Reliability and validity of the INFOOT three-dimensional foot digitizer for patients with rheumatoid arthritis},
  volume       = {101},
  year         = {2011},
}

Chicago
De Mits, Sophie, Pascal Coorevits, Dirk De Clercq, Dirk Elewaut, James Woodburn, and Philip Roosen. 2011. “Reliability and Validity of the INFOOT Three-dimensional Foot Digitizer for Patients with Rheumatoid Arthritis.” Journal of the American Podiatric Medical Association 101 (3): 198–207.
APA
De Mits, S., Coorevits, P., De Clercq, D., Elewaut, D., Woodburn, J., & Roosen, P. (2011). Reliability and validity of the INFOOT three-dimensional foot digitizer for patients with rheumatoid arthritis. JOURNAL OF THE AMERICAN PODIATRIC MEDICAL ASSOCIATION, 101(3), 198–207.
Vancouver
1.
De Mits S, Coorevits P, De Clercq D, Elewaut D, Woodburn J, Roosen P. Reliability and validity of the INFOOT three-dimensional foot digitizer for patients with rheumatoid arthritis. JOURNAL OF THE AMERICAN PODIATRIC MEDICAL ASSOCIATION. 2011;101(3):198–207.
MLA
De Mits, Sophie, Pascal Coorevits, Dirk De Clercq, et al. “Reliability and Validity of the INFOOT Three-dimensional Foot Digitizer for Patients with Rheumatoid Arthritis.” JOURNAL OF THE AMERICAN PODIATRIC MEDICAL ASSOCIATION 101.3 (2011): 198–207. Print.