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http://dx.doi.org/10.12674/ptk.2013.20.2.060

Reliability and Validity of Measurement Using Smartphone-Based Goniometer of Tibial External Rotation Angle in Standing Knee Flexion  

Jeon, In-Cheol (Dept. of Physical Therapy, The Graduate School, Yonsei University)
Kwon, Oh-Yun (Dept. of Physical Therapy, College of Health Science, Yonsei University, Dept. of Ergonomic Therapy, The Graduate School of Health and Environment, Yonsei University)
Weon, Jong-Hyuck (Dept. of Physical Therapy, College of Tourism & Health, Joongbu University)
Ha, Sung-Min (Dept. of physical Therapy, Division of Health Science, Baecseok University)
Kim, Si-Hyun (Dept. of Physical Therapy, The Graduate School, Yonsei University)
Publication Information
Physical Therapy Korea / v.20, no.2, 2013 , pp. 60-68 More about this Journal
Abstract
The purpose of this study was to assess the intra-rater test-retest reliability of tibial external rotation angle measurement using a smartphone-based photographic goniometer, DrGoniometer (DrG) compared to a three-dimensional motion analysis system (Vicon). The current study showed an interchangeable method using DrG to measure the tibial external rotation angle in standing knee flexion at $90^{\circ}$. Twelve healthy subjects participated in this study. A rest session was conducted 30 minutes later for within-day reliability and five days later for between-day intra-rater test-retest reliability. To assess the validity of the measurement using DrG, we used a three dimensional motion analysis system as a gold standard to measure the angle of tibial external rotation. Intra-class correlation coefficient (ICC) and the standard error of measurement (SEM) values were used to determine the within- and between- day intra-rater test-retest reliability of using DrG and a three dimensional motion analysis system. To assess validity, Pearson correlation coefficients were used for two measurement techniques. The measurement for tibial external rotation had high intra-rater test-retest reliability of within-day (ICC=.88) and between-day (ICC=.83) reliability using DrG and of within-day (ICC=.93) and between-day (ICC=.77) reliability using a three-dimentional motion analysis system. Tibial external rotation angle measurement using DrG was highly correlated with those of the three-dimensional motion analysis system (r=.86). These results represented that the tibial external rotation angle measurement using DrG showed acceptable reliability and validity compared with the use of three-dimensional motion analysis system.
Keywords
DrGoniometer; Reliability; Three-dimensional motion analysis system; Tibial external rotation angle; Validity;
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