ASIA impairment scale

What is the ASIA impairment scale?

The ASIA impairment scale is the internationally accepted method for classifying spinal cord injury. It comes from the American Spinal Injury Association and is applied through a standardized physical examination.

The examination tests motor function in specific muscle groups and sensation at defined points on the body, producing both a neurological level and a severity grade.

Its value is consistency. Because the protocol is standardized, an examination performed in one hospital can be compared meaningfully against one performed months later elsewhere.

That comparability is exactly what makes it useful in litigation as well as in treatment.

What do the grades mean?

The scale runs from complete loss through normal function.

• Grade A, complete, with no motor or sensory function in the lowest sacral segments
• Grade B, sensory incomplete, with sensation but no motor function preserved below the level
• Grade C, motor incomplete, with most key muscles below the level testing weak
• Grade D, motor incomplete, with most key muscles below the level testing stronger
• Grade E, normal function on examination in someone with a prior deficit

Why does the grade matter so much?

Because it anchors the prognosis. Published outcome data is organized by ASIA grade, so the classification determines what recovery is statistically expected.

That in turn determines the life care plan, the equipment projection and the attendant care hours, which together dominate the value of a spinal cord claim.

A shift of one grade can change a projection by a very large amount, which is why the classification is examined closely by both sides.

How is the grade contested?

Through the timing and quality of the examinations. An assessment performed during spinal shock, under sedation or without full cooperation may not be reliable.

Serial examinations are therefore more persuasive than any single one, since they show a trajectory rather than a snapshot.

Defense experts frequently argue for a higher grade to support an improvement projection, and the response is usually the consistency of the treating record over time.

Common questions

Who performs an ASIA examination?

A trained clinician, typically a physiatrist or spinal specialist, following the standardized protocol. Training matters because the examination is detailed.

Can the grade change?

Yes, particularly in the first year. Improvement from a lower grade to a higher one is documented through serial examinations.

Is the grade the same as the injury level?

No. The level identifies where the injury is on the cord, and the grade describes how much function was lost. Both are recorded.