Abstract
Item-Glatthorn JF, Casartelli NC, Petrich-Munzinger J, Munzinger UK, Maffiuletti NA.
Validity of the Intelligent Device for Energy Expenditure and Activity accelerometry
system for quantitative gait analysis in patients with hip osteoarthritis.
Objective
To evaluate the concurrent validity of an accelerometry-based system (Intelligent
Device for Energy Expenditure and Activity) with a criterion instrument (Gaitrite)
for the evaluation of spatiotemporal gait variables in orthopedic patients.
Design
Validity study.
Setting
Research laboratory in an orthopedic hospital.
Participants
Men with unilateral hip osteoarthritis (N=26; mean age ± SD, 54±9y).
Interventions
Not applicable.
Main Outcome Measures
Patients were asked to walk at normal and fast velocities while gait cycle, swing,
double support, step length, cadence, and speed were concomitantly recorded with the
2 instruments. Concurrent criterion-related validity was examined using intraclass
correlation coefficients and Bland-Altman limits of agreement.
Results
Intraclass correlation coefficients were acceptable for all gait parameters (range,
.815–.997), except step length (.783). Limits of agreement were low for gait cycle,
swing, and cadence, though relatively high for double support, step length, and speed.
A significant bias between the 2 measuring instruments was consistently observed.
Conclusions
In patients with hip osteoarthritis, quantitative gait analysis with the IDEEA accelerometry
system was satisfactory for the main temporal gait parameters, while double support,
step length, and walking speed quantifications were invalid. The IDEEA system should
be used with caution, and modifications of the system are recommended for improved
use in clinical practice and research.
Key Words
List of Abbreviations:
ICC (intraclass correlation coefficient), LOA (limit of agreement), OA (osteoarthritis)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: July 06, 2012
Footnotes
No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit on the authors or on any organization with which the authors are associated.
In-press corrected proof published online on Aug 17, 2012, at www.archives-pmr.org.
Identification
Copyright
© 2012 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.
