This review article (published in 2004) looks at the evidence available for FES correction of dropped foot in stroke patients. Outcome measures of walking speed and effort (Physiological Cost Index) are included.
The full article is published in Artif Organs 2004 Jun;28(6):577-86.
the_orthotic_effect_of_functional_electrical_stimulation_on_the_improvement_of_walking_in_stroke_patients_with.pdf