Ground reaction forces during ambulation in parkinsonism: pilot study

Gait abnormality in parkinsonism is unique and easily recognizable. A pilot study was designed at our Human Gait Laboratory to learn how this gait abnormality is reflected in ground reaction forces of patients with parkinsonism. The system permitted the collection of kinematic and force data from a subject in real time. Analysis showed an abnormality in the vertical force (Fz) component, the second peak being significantly reduced in size, with asymmetry in the duration of the stance phase. These abnormalities were also reflected in the stance phase and in the angular changes in the knee. Similar analyses should be helpful in following the progress of the disease.