ASIA Impairment Scale 

Updated: Nov 25, 2014
  • Author: Buck Christensen; Chief Editor: Buck Christensen  more...
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ASIA Impairment Scale

The extent of spinal cord injury (SCI) is defined by the American Spinal Injury Association (ASIA) Impairment Scale (modified from the Frankel classification), using the following categories: [1, 2]

  • A = Complete: No sensory or motor function is preserved in sacral segments S4-S5
  • B = Incomplete: Sensory, but not motor, function is preserved below the neurologic level and extends through sacral segments S4-S5
  • C = Incomplete: Motor function is preserved below the neurologic level, and most key muscles below the neurologic level have a muscle grade of less than 3
  • D = Incomplete: Motor function is preserved below the neurologic level, and most key muscles below the neurologic level have a muscle grade that is greater than or equal to 3
  • E = Normal: Sensory and motor functions are normal