What is preserved in posterior cord syndrome despite injury?

In posterior cord syndrome, the primary preservation is the motor function of the upper and lower limbs, which distinguishes this condition from other types of spinal cord injuries. This syndrome specifically affects the dorsal columns responsible for proprioception and vibratory sense, leading to a loss of these modalities.

Despite the injury, motor pathways, particularly the corticospinal tract, may remain intact because posterior cord syndrome predominantly involves damage to the posterior columns. This allows for some level of motor function despite sensory deficits.

Light touch sensation and other sensory modalities (such as proprioception and vibratory sensation) are typically affected due to the involvement of the posterior columns. Ambulation ability might be preserved to some extent depending on the location and severity of the injury but is not guaranteed as it depends on other factors, including the integrity of the motor pathways and lower limb coordination. Overall, the preservation of motor function is a key characteristic of posterior cord syndrome.