Article

The Gait Deviation Index (GDI) is a dimensionless parameter that evaluates the
deviation of kinematic gait from a control database. The GDI can be used to
stratify gait pathology in children with cerebral palsy (CP). In this paper the
repeatability and uncertainty of the GDI were evaluated.
The Correlation between
the GDI and the Gross Motor Function Classification System (GMFCS) was studied
for different groups of children with CP (hemiplegia, diplegia, triplegia and
quadriplegia). Forty-nine, typically developing children (TD) formed our
database. A retrospective study was conducted on our 3D gait data and clinical
exams and 134 spastic children were included. Sixteen TD children completed the
gait analysis twice to evaluate the repeatability of the GDI (test-retest
evaluation). Monte Carlo simulations were applied for all groups (TD and children
with CP) in order to evaluate the propagation of errors stemming from kinematics.
The repeatability coefficient (2SD of test-retest differences), obtained on the
GDI for the 16 TD children (32 lower limbs) was +/- 10. Monte Carlo simulations
showed an uncertainty ranging between 0.8 and 1.3 for TD children and all groups
with CP. The Spearman Rank correlation showed a moderate correlation between the
GDI and the GMFCS (r=-0.44, p<0.0001).
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Langue : ANGLAIS