Conus medullaris syndrome is a specific type of spinal cord injury affecting the conus medullaris, the tapered lower end of the spinal cord that typically terminates between the T12 and L2 vertebral levels. This region is critical because it contains the sacral spinal cord segments (S2-S5) and the coccygeal segment, which control essential bodily functions including bowel, bladder, and sexual function. When this area is damaged through trauma, the resulting neurological deficits can be profound and permanent.
The syndrome is often confused with cauda equina syndrome, but they are distinct conditions. Conus medullaris syndrome involves damage to the actual spinal cord tissue, while cauda equina syndrome affects the nerve roots below the spinal cord. However, many patients experience a mixed presentation called conus-cauda syndrome, where both structures are injured. Understanding this distinction is crucial for medical treatment and legal claims, as the prognosis and long-term care needs differ significantly.
Common causes of conus medullaris syndrome include high-impact motor vehicle accidents, falls from significant heights, direct trauma to the lower back, compression fractures of the thoracolumbar spine, and penetrating injuries such as gunshot wounds. In California, car accidents and motorcycle crashes are the leading causes of traumatic conus medullaris injuries. The sudden force can fracture vertebrae, dislocate spinal segments, or cause disc herniations that compress the conus medullaris, leading to immediate and often irreversible damage.