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ASIA Injury Classification

Grade Description
A Complete: No motor or sensory function is preserved in the sacral segments S4-S5.
B Incomplete: Sensory but not motor function is preserved below the neurological level and includes the sacral segments S4-S5.
C 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.
D 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.
E Normal: Motor and sensory functions are normal.
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