ASIA AIS scale

• ASIA (American Spinal Injury Association) Impairment Scale (AIS)
• Used to classify severity/completeness of SCI, from  A” (complete SCI) to “E” (normal sensory and motor function)
• A: Complete. No sensory or motor function is preserved in the sacral segments S4-S5.
• B: Sensory incomplete. Sensory but not motor function is preserved below the neurological level and includes the sacral segments S4-S5 (light touch, pin prick at S4-S5 or deep anal pressure), AND no motor function is preserved more than three levels below the motor level on either side of the body.
• C:  Motor incomplete. Motor function is preserved below the neurological level and more than half of key muscle functions below the single neurological level of injury (NLI) have a muscle grade less than 3.
• D: Motor incomplete. Motor function is preserved below the neurological level and at least half of key muscle functions below the NLI have a muscle grade of 3 or greater.
• E: Normal. If sensation and motor function as tested with the ISNCSCI are graded as normal in all segments, and the patient had prior deficits, then the AIS grade is E. Someone without an initial SCI does not receive an AIS grade.

Voiding function

• AIS A - nearly 0% chance of volitionally voiding in the future
• AIS C/D with good lower motor function - ~ 75% chance of volitionally voiding in the future