Abstract: The present invention involves an electrical muscle stimulator for knee stabilization in a leg having inadequate neurological and muscular control to obtain normalization of locomotion and includes a power source, muscle stimulation electrodes, a control unit with manual on/off and with two control on/off switches. One of these switches is responsive to a heel ground contact determining means and the other to a knee angle determining means. Stimulation can only be effected when both the knees are in contact with some weight pressure and the knee angle measuring means shows the knees bent to or beyond a preset angle. As soon as one of these two conditions are not met, stimulation ceases.