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Validity of the intelligent device for energy expenditure and activity accelerometry system for quantitative gait analysis in patients with hip osteoarthritis

Article consultable sur : http://www.archives-pmr.org

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.
CI - Copyright (c) 2012 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS

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