174
· DOS Abstracts
Reliability of Instrumented gait analysis in children
with spastic cerebral palsy
Helle Mätzke Rasmussen, Dennis Brandborg Nielsen, Niels Wisbech Pedersen,
Søren Overgaard, Anders Holsgaard-Larsen
The Orthopaedic Research Unit, 1) Department of Orthopaedic Surgery and
Traumatology Odense University Hospital 2) Institute of Cli
Background:
Instrumented gait analysis (IGA) is used to describe gait pattern
and impairments in children with cerebral palsy (CP). Gait Deviation Index (GDI)
is based upon kinematic data from the IGA and is a quantitative index that sum-
marizes the overall gait function into a single score. Satisfactory concurrent and
construct validity of the GDI have been shown in children with CP. But test-
retest intra- assessor reliability of GDI has not previously been investigated.
Purpose / Aim of Study:
The aim of this study is to investigate intra- assessor
reliability of GDI in children with CP across two repeated sessions.
Materials and Methods:
For intra-assessor reliability the assessor teams
completed the IGA on two different days, separated by 0-9 days. A total of 18
children (mean age 8.0 years, SD 2.1) with spastic CP (10 uni- and 8 bilateral)
participated. For each IGA the GDI score of 5 trials were obtained and the me-
dian GDI score for each child on the left and right side were used for further
analysis. Intra-assessor reliability was investigated with calculation of a paired
Intraclass correlation coefficient (ICC), Standard error of measure (SEM), and
smallest detectable change (SDC) based on 95% confidence intervals.
Findings / Results:
The reliability for GDI with ICC was found to be 0.74-0.84
that is considered as moderate to good. SEM was found to be 4.6-6.3 point
and finally SDC was found to be 12.7-17.4 points. No significant learning effect
and/or systematic bias were observed between test and retest.
Conclusions:
The present observed moderate to good reliability holds promise
for the use of GDI as an outcome in clinical research investigating difference
between groups. The SDC was found to be larger than what can be expected for
most interventions on an individual level. Thus, GDI is not applicable to evaluate
intervention for an individual child.
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