Reproducibility and validity of video screen measurements of gait in children with spastic cerebral palsy☆
Received 11 May 2009; received in revised form 4 February 2010; accepted 14 February 2010. published online 22 March 2010.
Abstract
Purpose
To determine the reproducibility and validity of video screen measurement (VSM) of sagittal plane joint angles during gait.
Methods
17 children with spastic cerebral palsy walked on a 10m walkway. Videos were recorded and 3d-instrumented gait analysis was performed. Two investigators measured six sagittal joint/segment angles (shank, ankle, knee, hip, pelvis, and trunk) using a custom-made software package. The intra- and interrater reproducibility were expressed by the intraclass correlation coefficient (ICC), standard error of measurements (SEM) and smallest detectable difference (SDD). The agreement between VSM and 3d joint angles was illustrated by Bland–Altman plots and limits of agreement (LoA).
Results
Regarding the intrarater reproducibility of VSM, the ICC ranged from 0.99 (shank) to 0.58 (trunk), the SEM from 0.81° (shank) to 5.97° (trunk) and the SDD from 1.80° (shank) to 16.55° (trunk). Regarding the interrater reproducibility, the ICC ranged from 0.99 (shank) to 0.48 (trunk), the SEM from 0.70° (shank) to 6.78° (trunk) and the SDD from 1.95° (shank) to 18.8° (trunk). The LoA between VSM and 3d data ranged from 0.4±13.4° (knee extension stance) to 12.0±14.6° (ankle dorsiflexion swing).
Conclusion
When performed by the same observer, VSM mostly allows the detection of relevant changes after an intervention. However, VSM angles differ from 3d-IGA and do not reflect the real sagittal joint position, probably due to the additional movements in the other planes.
aDepartment of Rehabilitation Medicine, VU University Medical Center, Amsterdam, The Netherlands
bDepartment of Child Neurology, University Children's Hospital, Inselspital, Bern, Switzerland
cResearch Institute MOVE, VU University Medical Center, Amsterdam, The Netherlands
Corresponding author at: Department of Child Neurology, University Children's Hospital, Inselspital, 3015 Bern, Switzerland. Tel.: +41 32 632 94 24; fax: +41 31 632 95 00.
☆ During his work at this study Sebastian Grunt was supported by grants of the Anna Müller-Grocholski Foundation, Zürich, Switzerland and the Swiss Foundation for Children with Cerebral Palsy, Berne, Switzerland.
ABSTRACT