| Sumario: | Assessment of proprioception is useful for clinician practice. The feeling is not retained for the proprioceptive assessment while it is used for dyspnoea or perception of effort with visual analogue scale. Proprioception assessment is often complicated and costly, making it unsuitable for clinical practice. The aim of this study is twofold, 1) to evaluate the correlation between the outcomes of a visual analogue scale and a joint position sense error and 2) to validate the use of an affordable inertial measurement unit. Correlation coefficients between angular joint position error and the feeling of error measured with a visual analogue scale were computed. Data were collected using a smartphone's IMU and the Phyphox application. A total of 30 subjects were divided in two groups ("test group" and "error group"). Each subject performed six arm flexion movements for a total of 90 acquisitions per group. The "error group" had good capabilities in error detection as 100% of them detected two out of three errors (false positioning). Pearson correlation coefficients were 0.85 (p < 0.001), 0.76 (p < 0.005) and 0.91 (p < 0.005) depending on the shoulder flexion angle ranges. The positive correlation between error in perception of joint position and the values of the visual analogue scale shows that the subjects' sensation could be used to assess proprioception, as the perceptive scale is a complementary piece of data to the quantitative assessment in order to have a patient-centred approach. • Our results reveal a subjective ability to detect joint repositioning errors of the shoulder during flexion. • The error estimation through a Visual Analog Scale is correlated with the true angular error. • The clinical use of IMU-based application is compatible with proprioception measurement in clinical practice. • There was no effect of angle range of motion on joint repositioning error.
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