Spinal cord injuries may be “complete” or “incomplete.” According to the National Institutes of Health (NIH): “An incomplete injury means that the ability of the spinal cord to convey messages to or from the brain is not completely lost. People with incomplete injuries retain some sensory function and may have voluntary motor activity below the injury site. The higher in the spine in which an injury occurs, the more severe the damage. As such, an injury in the cervical spinal cord is the most serious, and generally includes the greatest number of complications.