ASIA Injury Classification

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

Incomplete: Sensory but not motor function is preserved below the neurological level and includes the sacral segments S4-S5

Incomplete: Motor function is preserved below the neurological level, and more than half of key muscles below the neurological level have a muscle grade less than 3

Incomplete: Motor function is preserved below the neurological level, and at least half of key muscles below the neurological level have a muscle grade of 3 or more

Normal: Motor and sensory function are normal