A rating used to classify the severity of a spinal cord injury based on the American Spinal Injury Association Impairment Scale (AIS):

“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”.

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