Movement disturbances in patients with Parkinson's disease (PD) are one of the most important clinical symptoms. Locomotion analysis systems are one of perspective directions of instrumental diagnosis of movement disturbances. We studied 113 patients, including 53 patients with PD (18 with the tremor type, 25 with rigid type), and 60 healthy volunteers. Indices of purposeful and no-purposeful movements and useful movements' coefficient were specified in the motion analysis software V&A. The index of no-purposeful movements can be used as a reliable marker of side-dependent clinical symptoms in the rigid PD type.