Spinal Injury Impairment Scale*

A

Complete: There is no motor or sensory function, including in the sacral segments S4–S5.

B

Incomplete: Sensory but not motor function is preserved below the affected neurologic (spinal cord) level, including in the sacral segments S4–S5.

C

Incomplete: Motor function is preserved below the neurologic level, and more than half of key muscles below the neurologic level have a muscle strength grade of < 3.

D

Incomplete: Motor function is preserved below the neurologic level, and at least half of key muscles below the neurologic level have a muscle grade of ≥ 3.

E

Normal: Motor and sensory function are normal.