TABLE 1.

ASIA Impairment Scale: International Standards for Neurological Classification of SCI

Grade	Classification	Motor or sensory involvement
AIS-A	Complete	No sensory of motor function is preserved in the sacral segments S4-S5.
AIS-B	Sensory incomplete	Sensory but not motor function is preserved at the most caudal sacral segments S4-S5, and no motor function preserved >3 levels below the motor level on either side of the body.
AIS-C	Motor incomplete	Motor function preserved at the most caudal sacral segments on voluntary anal contraction, or the patient meets the criteria for sensory incomplete (above) with motor sparing >3 levels. <50% of key muscle functions below the single NLI with muscle grade ≥3.
AIS-D	Motor incomplete	Motor incomplete status as with AIS C, and with at ≥50% of key muscle functions below the single NLI with muscle grade ≥3.
AIS-E	Normal	Motor and sensory function are normal.