Highlights
- •Angles app is a valid and reliable tool for assessing joint angles.
- •Angles app can be used during static and dynamic activity for adults and children.
- •Angles app is an affordable and user-friendly tool for clinicians and researchers.
- •Angles app allows users to measure range of motion during meaningful activities across time.
Abstract
Objective
To assess the convergent validity and reliability of joint angle measurements from
a new video goniometer iPhone/iPad application separately in adults, older and young
children.
Design
Cross-sectional.
Setting
Child care and university environments.
Participants
Fifty-four adults (mean ± SD=22.5±4.5y), 20 older children (mean ± SD=10.9±2.2y), 20 younger children (mean ± SD=1.6±0.8y) (N=94).
Interventions
Adults and older children performed both standardized static positions and functional
activities. Younger children performed only a functional activity protocol.
Main Outcome Measures
Joint angle measurements using the app were validated against a commercially validated
two-dimensional goniometric software program. In addition, validity of the app was
compared to a standard mechanical goniometer for the measurement of angles drawn on
a white board. Intra- and interrater reliability were assessed through independent
rescoring of videos.
Results
Correlations between joint angle estimates obtained from the app and goniometer software
or a mechanical goniometer were positive and very strong (r>.900; P<.0001). The intraclass correlation coefficient (ICC) for repeated scoring from the
app indicated excellent intra- and interrater reliability (ICC>.900).
Conclusions
High correlations for repeated measures and comparison to gold standard angle measurement
instruments suggest that the new app is a valid and reliable tool for assessing joint
angles during functional activity. This tool may provide clinicians an inexpensive
yet accurate method for quantification of movements and immediate feedback on range
of motion during tasks in a natural environment.
Keywords
List of abbreviations:
2D (two-dimensional), 3D (three-dimensional), 95% CI (95% confidence interval), ICC (intraclass correlation coefficient)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: August 26, 2019
Footnotes
Supported by Duquesne University through a faculty development grant to R.H. (A Mobile Application for Early Quantification of Motor Skill in Infants at Risk) and an Institute for Education Sciences grant to R.H. and M.A.L. (grant no. R324A150103: Sitting Together And Reaching To Play [START-PLAY]).
N.J.C. reported receiving honoraria from developing the Angles app. He also receives a percentage of the cost for each $0.99 purchase through the Apple Store. The other authors have nothing to disclose.
Identification
Copyright
© 2019 by the American Congress of Rehabilitation Medicine
