Imagine being told you might never walk again.
I'd hate to think how I would react to that news.
Any damage to the nervous system can cause paralysis.
It is more common with injury to the spinal cord, but other causes are stroke, cerebral palsy, Parkinson's, multiple sclerosis and spina bifida.
Tauranga's David Benfell was one of those people who was faced with the traumatising news that he may never walk again. The former paratrooper crashed during his 235th free-fall jump. The accident resulted in a serious back injury which ended his military career.