More than 1 million Americans suffer paralysis from spinal cord injuries.
Now a new treatment is providing major advancements for people with those injuries.
Researchers at the University of Louisville say four paralyzed men are now able to move certain muscles in their legs.
These men are using an electrical simulator implanted on their spinal cords to make them movie.
"This is a very, very low-level stimulus that is reawakening the circuits to cause the circuits to remember what they used to do,” said Grace Peng, Ph.D. of the National Institutes of Health
The four men using the simulators are regaining muscle mass and other functions like bladder control.