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Assessing the Validity and Reliability of a New Video Goniometer App for Measuring Joint Angles in Adults and Children

Published:August 26, 2019DOI:https://doi.org/10.1016/j.apmr.2019.07.008

      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)
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