i will walk again. >> reporter: elena cho, cnn, charles bad, california. "360" sanjay gupta a practicing neurosurgeon. they talked about an incomplete spinal injury, what does that mean? how extensive may kendall's injuries have been? >> it really makes a world of difference whether somebody has a complete spinal cord injury or incomplete. complete means it had such a significant impact, the cells in that area, they died. incomplete means a different thing, you take away the muscle and blood vessels here. take a look, this is the spine, designed to protect the spinal cord, yellow inside. incomplete, pressure on the back, front, side. the entire spinal cord was not damaged, there is still some possibility of connections getting through. in the world of neurosurgery and rehab, that simple point makes a