Introduction: The most common way of measuring joint mobility is goniometric measurements. Measurements are performed with a universal goniometer. We carry them out in order to obtain objective measurements of the flexibility of a particular joint. Some ranges of motion can also be measured only with a centimetre tape. From linear measurements, the range of motion can be calculated using trigonometric equations. Because measurements are usually conducted by different therapists, the intratester reliability is very important. Purpose: The purpose of the thesis was to identify the repeatability and reliability of trigonometric measurements of the active range of motion in the knee joint. Methods: The study involved 40 healthy subjects.. Measurements were made in two sessions within a 48.. The differences between the measurements were assessed by the analysis of the variance for repeated measurements (p⡤0.05). Repeatability and reliability were evaluated by intraclass correlation coefficient (2,1). We also calculated the lowest real difference. Results: In the repeatability test, the lowest value of the intraclass correlation coefficient (0.895) was observed when measuring the flexion of the left knee joint in the second session. The highest value of the intraclass correlation coefficient (0.936) was observed in the measurements of the extension of the left knee joint in the first session and in the measurements of the flexion of the left knee joint in the first session. All measurements had values of intraclass correlation coefficient higher than 0.900, which means excellent repeatability. Extension measurements proved to be more reproducible than flexion measurements. When calculating the reliability of the extension, the lowest value of the intraclass correlation coefficient was in the measurements, where only the third measurement of the extension of the left knee joint was considered (0.728). The highest value of the intraclass correlation coefficient was in the average of three measurements of extension in the right knee joint (0.953). In flexibility reliability measurements, the lowest value of the intraclass correlation coefficient was the average of the three left knee flexion measurements (0.784). The highest value of the intraclass correlation coefficient was in the average of three measurements of right knee joint flexion (0.958). All measurements (except one) had values of intraclass correlation coefficient higher than 0.750, which means good reliability. Discussion and conclusion: Trigoniometric measurements of the knee joint are repeatable and reliable, slightly more in the measurements of extension than in the measurement of the active movement of the knee joint flexion. Reliability is comparable to the other research already conducted. No data on repeatability were found in the literature.
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