This paper presents case series data for FES users who had progressive (mostly MS) and none progressive (stroke and SCI) conditions resulting in drop foot. The study showed that both groups responded well with the device but the training effect seen in MS was less and short term compared to the other group. Both groups had an effective orthotic effect.
The full article is published in Neurorehabil Neural Repair. 2010 Feb;24(2):152-67.
long_term_theraputic_and_orthotic_effects_of_a_foot_drop_stimulator_on_walking_in_progresive_and_nonprogresive_neurological_disorders.pdf