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A Study on The Reliability and Validity of Measuring The Range of Motion of The Knee Joint Using A Universal Goniometer and A Smartphone Application-Based Goniometer

  • Journal of the Korean Society of Physical Medicine
  • Abbr : J Korean Soc Phys Med
  • 2024, 19(4), pp.59-65
  • Publisher : The Korean Society of Physical Medicine
  • Research Area : Medicine and Pharmacy > Physical Therapy > Other physical therapy
  • Received : September 30, 2024
  • Accepted : October 30, 2024
  • Published : November 30, 2024

전은영 1,  장희진 1,  Nam Yeon Gyo 2

1선문대
2선문대학교

Accredited

ABSTRACT

PURPOSE: Range of motion (ROM) can help accurately interpret the patient's condition. With the increasing number of applications that can turn mobile phones into medical devices, measuring ROM has become possible. Therefore, the purpose of this study is to investigate the reliability and validity of knee joint range of motion measurements in healthy adults, utilizing both a smartphone application-based goniometer and a goniometer. METHODS: After recruiting 20 healthy adult subjects, the purpose of the study and the experimental procedures were explained. Two raters used two devices (goniometer and smartphone application-based goniometer) to measure active full knee flexion, active full knee extension, and active 90 degrees of flexion for all subjects. It was divided into the first and second measurements, and each measurer took turns performing the measurements. The normal distribution of the collected measurements was confirmed using the Kolmogorov-Smirnov test. RESULTS: Intra-rater reliability and inter-rater reliability showed very high reliability (ICC > .80) for all measures, and the normal distribution of each measure was confirmed through a normality test with a statistically significant difference. Validity between the two devices showed a strong positive linear relationship (r = .96) and statistically significant differences (p < .000). CONCLUSION: The app-linked digital therapeutic device used in this study showed high reliability and validity when compared to the goniometer used in clinical practice. Therefore, when measuring knee joint range of motion in clinical practice, the app-linked digital therapy device used in this study can be considered.

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This paper was written with support from the National Research Foundation of Korea.
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