Article

This article introduces a new index, the GDI-Kinetic; a direct analog of the GDI
based on joint kinetics rather than kinematics. The method consists of: (1)
identifying "features" of the raw gait kinetic data using singular value
decomposition, (2) identifying a subset of features that account for a large
percentage of the information in the raw gait kinetic data, (3) expressing the
raw data from a group of typically developing children as a linear combination of
these features, (4) expressing a subject's raw data as a linear combination of
these features, (5) calculating the magnitude of the difference between the
subject and the mean of the control, and (6) scaling and transforming the
difference, in order to provide a simple, and statistically well-behaved,
measure. Linear combinations of the first 20 gait features produced a 91%
faithful reconstruction of the data. Concurrent and face validity for the
GDI-Kinetic are presented through comparisons with the GDI, Gillette Functional
Assessment Questionnaire Walking Scale (FAQ), and topographic classifications
within the diagnosis of Cerebral Palsy (CP). The GDI-Kinetic and GDI are linearly
related but not strongly correlated (r(2)=0.24). Like the GDI, the GDI-Kinetic
scales with FAQ level, distinguishes levels from one another, and is normally
distributed across FAQ levels six to ten, and among typically developing
children. The GDI-Kinetic also scales with respect to clinical involvement based
on topographic CP classification in Hemiplegia types I-IV, Diplegia, Triplegia,
and Quadriplegia. The GDI-Kinetic complements the GDI in order to give a more
comprehensive measure of gait pathology.
CI - Copyright (c) 2011 Elsevier B.V. All rights reserved.

Langue : ANGLAIS