Validity of the Intelligent Device for Energy Expenditure and Activity Accelerometry System for Quantitative Gait Analysis in Patients With Hip Osteoarthritis

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.ObjectiveTo 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.DesignValidity study.SettingResearch laboratory in an orthopedic hospital.ParticipantsMen with unilateral hip osteoarthritis (N=26; mean age ± SD, 54±9y).InterventionsNot applicable.Main Outcome MeasuresPatients 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.ResultsIntraclass 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.ConclusionsIn 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.