Table 2 Five categories of the ASIA impairment scale

A

Complete. No sensory or motor function

is preserved in the sacral segments S4-S5.

B

Sensory Incomplete. Sensory but not

motor function is preserved below the

neurological level and includes the sacral

segments S4-S5 (light touch, pin prick at S4-S5:

or deep anal pressure (DAP)), and no motor

function is preserved more than three levels below

the motor level on either side of the body.

C

Motor Incomplete. Motor function is

preserved below the neurological level, and

more than half of key muscle functions below the

single neurological level of injury (NLI) have a

muscle grade less than 3 (Grades 0–2).

D

Motor Incomplete. Motor function is

preserved below the neurological level, and at

least half (half or more) of key muscle functions

below the NLI have a muscle grade > 3.

E

Normal. If sensation and motor function

are graded as normal in all segments, and the

patient had prior deficits, then the AIS grade is E.