The study will be carried out in two phases. Phase one (4 weeks) will focus on evaluating the usability of the Novus system. Phase two (8 weeks) will enable continued clinical follow up. The study will include sixteen (16) subjects suffering from foot drop and thigh muscles weakness due to upper motor neuron injury or disease; eight (8) subjects will be new users with no Functional Electrical Stimulation (FES) experience and the other eight (8) will be experienced Ness L300/Ness L300 Plus users. Phase two of the study will include only the new users.