Background: The position of the subject is an important part of goniometry, as it determines the reliability and validity of the procedure. Positions in which one or more of the soft joint structures are under tension will result in a lower measured value. We've evaluated the psychometric properties of the knee joint active range of motion measurement in the horizontal plane. Methods: The study included 30 subjects with an average age of 63.4 (13.7) years. The measurements were taken in two sessions 48 hours apart. In each session, three consecutive measurements of the range of motion of extension and flexion of the knee were performed on both lower limbs. Results: In the repeatability test, the lowest intraclass correlation coefficient (ICC) (0.451) was found for knee joint extension measurements and the highest (0.883) was obtained for knee joint flexion measurements. The mean ICC values for flexion (0.834) indicate good or high reliability, while the values for extension (0.182) indicate very low reliability. Measurements of flexion on side lying position proved to be more repeatable than measurements of extension. Conclusion: The method of measuring knee range of motion in the side lying position is not yet applicable in practice, as it is necessary to introduce some improvements to the measurement procedure itself.
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