People with spinal cord injuries may have some degree of sensation in the legs if they have an incomplete injury. This is an injury that damages the spinal cord but doesn't sever it, so sensory messages can travel to and from the brain. It usually occurs after compressions, deep bruising or when pieces of spinal cord are dug out by broken vertebrae. Complete spinal cord injuries are less common than incomplete spinal cord injuries and are a result of a spinal cord that is completely cut in half. There is absolutely no sensation in the legs under this circumstance.