ASIA Impairment Scale

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Last updated 4:37 AM on 8/25/26
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6 Terms

1
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What is ASIA A?

  • Complete SCI

  • No sensory function preserved at S4–S5

  • No motor function preserved at S4–S5

  • No sacral sparing


2
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What is ASIA B?

  • Sensory incomplete

  • Sensory function preserved below neurologic level

  • Sensory function extends through S4–S5

  • Motor function does not qualify as motor incomplete


3
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What is ASIA C?

  • Motor incomplete

  • Motor function preserved below neurologic level

  • More than half of key muscles below neurologic level are:

    • Less than 3/5


4
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What is ASIA D?

  • Motor incomplete

  • Motor function preserved below neurologic level

  • At least half of key muscles below neurologic level are:

    • 3/5 or greater


5
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What is ASIA E?

  • Normal

  • Sensory function normal

  • Motor function normal


6
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What is the key difference between ASIA C and ASIA D?

  • ASIA C:

    • Majority of key muscles below lesion are <3/5

  • ASIA D:

    • At least half are ≥3/5

  • 3/5 = movement against gravity