This rat had a severely injured spinal cord. But with a special cocktail of medicines, electrical stimulation to the lower spinal cord, the support of a robotic arm and a bit of chocolate, it learned to walk again. Watch this incredible talk from Gregoire Courtine.
Could this work for humans who are paralyzed because of spinal cord injuries? VERY POSSIBLY. Here, a look at a study from a scientist connected to Courtine who tested a similar method on a 23-year-old man, with great success. Read the TED Blog story: A Promising First Step For Those With Spinal Cord Injury.