A Simple Electrogoniometric System and Its Testing

A simple goniometric system intended for quantitative evaluation of a patients' gait is described. The hip, knee and ankle angles of both legs in the sagittal plane and the contacts between ground and three parts of the sole were measured. By using a special knob to adjust and fix the knee potentiometer axis position, a small number of selectively chosen attachments and very light construction, the gait was disturbed to the minimum extent. The system's accuracy was tested by comparing the directly measured step length and the calculated one. The accuracy achieved was better than 5%.