ASIA Impairment Scale

Question 1

ASIA A

Answer 1

Complete: No sensory or motor function is preserved in sacral segments S4-S5

Question 2

ASIA B

Answer 2

SENSORY INCOMPLETE

Sensory function IS preserved below the neurologic level, including: S4-S5

AND

NO motor function is preserved more than 3 levels below the motor level on either side of the body.

(No perianal contraction, there is perianal sensation)

Question 3

ASIA C

Answer 3

“Weak” MOTOR INCOMPLETE

Motor function is preserved for voluntary anal contraction

OR

Patient is “sensory incomplete” AND has motor function more than 3 levels below the motor level on either side of the body

[Less than half of the key muscles function below overall neurologic level have a muscle grade >/= 3]

Question 4

ASIA D

Answer 4

“Strong” MOTOR INCOMPLETE

Motor function is preserved for voluntary anal contraction

OR

patient is “sensory incomplete” AND has motor function more than 3 levels below the motor level on either side of the body

[AT LEAST HALF (half or more), of key muscle functions below the neurologic level having a muscle grade >/= 3]

Question 5

ASIA E

Answer 5

NORMAL

Sensory and Motor functions are normal in a patient that had prior deficits