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 muscle grade of 3 or more
E normal
motor and sensory function are normal