Posterior cord syndrome results from damage to the dorsal columns and dorsal horn of the spinal cord, typically in the cervical or thoracic regions. This injury pattern is most commonly caused by hyperextension injuries, direct trauma to the posterior spine, or vascular compromise affecting the posterior spinal arteries. Unlike central cord syndrome or anterior cord syndrome, posterior cord syndrome leaves motor pathways largely intact while devastating the sensory pathways responsible for proprioception and fine touch.
The hallmark symptoms include severe ataxia (loss of coordination), inability to sense limb position without visual cues, loss of vibration sense, and impaired fine touch discrimination. Patients often describe feeling like they're walking on pillows or cotton, unable to judge where their feet are without looking. This creates profound disability despite preserved muscle strength, as coordinated movement becomes nearly impossible without constant visual monitoring.
Diagnosis requires comprehensive neurological examination including Romberg testing, vibration sense assessment with tuning forks, and proprioception testing. MRI imaging typically reveals damage to the posterior columns, though the injury may not always be immediately visible on initial scans. Early recognition is critical, as the treatment approach and prognosis differ significantly from other spinal cord injury patterns.