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.
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.
Research laboratory in an orthopedic hospital.
Men with unilateral hip osteoarthritis (N=26; mean age ± SD, 54±9y).
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.
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.
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.
List of Abbreviations:ICC (intraclass correlation coefficient), LOA (limit of agreement), OA (osteoarthritis)
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Published online: July 06, 2012
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.
© 2012 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.