ASIA Impairment Scale

The American Spinal Injury Association (ASIA) uses the following classifications to describe a person's functional impairment following a spinal cord injury:

A=Complete 

No motor or sensory function in the lowest sacral segment (S4-S5). 

B=Incomplete 

Sensory function below neurologic level and in S4-S5, no motor function below neurologic level. 

C=Incomplete 

Motor function is preserved below neurologic level and more than half of the key muscle groups below neurologic level have a muscle grade less than 3.

D=Incomplete 

Motor function is preserved below neurologic level and at least half of the key muscle groups below neurologic level have a muscle grade of 3 or more. 

E=Normal 

Sensory and motor function is normal. 


Loss of motor function means a person has no voluntary control of their muscles. 

Loss of sensory function means a person cannot feel hot or cold, pain or pressure.