Bioness has designed and released a device that bypasses the brain. By putting a sensor on a shoe, the device "knows" what the foot should be doing when someone is walking. The device then signals a second device, strapped to the calf, that has the ability to stimulate the nerves and cause the muscles in the calf to "operate" the foot.
I can't endorse the product outright, but this seems like a very plausible way of dealing with foot drop and I am encouraged that there are developments in the treatment of multiple sclerosis symptoms. Devices cost around $7,000 and right now I have no idea if insurance would cover that cost.
Find out more from the Bioness website.