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The objective of this study is to verify the ultrasound-based motion analysis method on 16 healthy people during gait. Ultrasound-based triplets were fixed onto the sacrum, the left and right thighs and the left and right calves. A ZEBRIS ultrasound-based motion analysis system was used for measur- ing the spatial coordinates of triplets during gait. The position of the nineteen anatomical points involved in the study was de- fined by an ultrasound-based pointer in the local coordinate sys- tem specified by the triplets before starting measurements. The spatial coordinates of the designated anatomical points can be calculated from the coordinate of triplets. The method is cali- brated with interobserver and intraobserver variations. On the basis of the statistical analysis of the spatial coordinates spec- ified by the ultrasound-based measurement method, it can be established that the measurement method is reproducible be- cause in case of an experienced person performing measure- ments the maximum standard deviation of coordinates is below 1 mm, and around 2 mm in case of a person inexperienced in measurements.

Verification of determining the spatial position of the lower extremity by ultrasound-based motion analyser