Grade spinal cord injury using the American Spinal Injury Association (ASIA) Impairment Scale. Grade A: complete (no sensory/motor in S4-S5). Grade B: sensory incomplete. Grade C: motor incomplete, majority key muscles below grade 3. Grade D: motor incomplete, majority key muscles grade 3 or above. Grade E: normal. Neurological level is the most caudal segment with normal function.
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