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OBJECTIVE: To compare the reliability and validity of the Korean range of motion standard protocol (KRSP) for measuring joint range of motion (ROM) with those of the conventional ROM measurement using a goniometer. METHODS: We conducted a randomized controlled trial involving 91 healthy elderly individuals. We compared two strategies of measuring joint ROM to evaluate the reliability and validity of each standardized protocol: first, the KRSP based on the Chungnam National University guidelines and second, handheld goniometric measurement. In the first strategy, 3 examiners (1 rehabilitation doctor, 1 physical therapist, and 1 physical therapy student) independently measured joint ROM in 46 randomly selected subjects; in the second strategy, another 3 examiners (1 rehabilitation doctor, 1 physical therapist, and 1 physical therapy student) measured joint ROM in 45 randomly selected subjects. The reliability of each protocol was calculated using intraclass correlation coefficient, ICC(2,1), and root mean square error (RMSE). RESULTS: Both protocols showed good to excellent intra-rater reliability. With goniometer use, the inter-rater reliability was low-ICC(2,1), 95% confidence interval ranged from 0.643 (0.486-0.783) to -0.078 (-0.296-0.494)- and RMSE was high. With the KRSP, the inter-rater reliability ranged from 0.846 (0.686-0.931) to 0.986 (0.972-0.994) and RMSE was low. CONCLUSION: ROM measurements using the KRSP showed excellent reliability. These results indicate that this protocol can be the reference standard for measuring ROM in clinical settings as an alternative to goniometers.
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