American Association of Neurological Surgeons American Association of Neurological Surgeons American Association of Neurological Surgeons Spinal Cord Injury American Association of Neurological Surgeons American Association of Neurological Surgeons American Association of Neurological Surgeons National Spinal Cord Injury Association second leading cause of spinal cord injury second leading cause of spinal cord injury 450,000 people American Association of Neurological Surgeons