Background: Compliant surfaces are commonly used for training of proprioception and assessment of proprioceptive component of balance. The purpose of the study was to compare the knee joint position sense in closed kinematic chain on a firm and compliant surface. Methods: 30 subjects with no previous injury or surgical procedures on the dominant leg participated in the study. They were randomly assigned to one of the two groups. Measurements of the knee joint position sense were repeated when subject performed one leg squat on the dominant leg, using an electrogoniometer SG 110 in two conditions. The starting position was angle 0° of the knee joint, target angles were 15° and 30° of the knee joint flexion. Results: No statistically significant difference was found between the two surfaces. Difference of mean absolute errors between the groups was statistically significant (p = 0.02) only for 15° of flexion on the firm surface (group 1: 6.31 ± 4.17 vs group 2: 3.20 ± 2.76). Conclusions: According to the obtained results, we concluded that there is no significant difference in the knee joint position sense in standing on a firm and compliant surface, but to confirm this study a larger sample is required.
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