How the ASIA Impairment Scale Is Administered After a Spinal Cord Injury

When a motor vehicle accident results in a spinal cord injury, one of the first clinical tools doctors use to assess the damage is the ASIA Impairment Scale (AIS) — developed by the American Spinal Injury Association. Understanding what this scale is, how it's administered, and why it matters can help injured people and their families make sense of what's happening medically — and why it carries weight in a personal injury claim.

What the ASIA Impairment Scale Measures

The AIS classifies the severity of a spinal cord injury based on motor and sensory function below the injury site. It answers two foundational questions: How much feeling remains? and How much voluntary movement remains?

The scale runs from AIS A through AIS E:

A complete injury (AIS A) does not always mean total paralysis for life — but it does mean no function is preserved through the sacral segments at the time of testing. An incomplete injury (AIS B–D) indicates some neural pathways remain intact, which generally correlates with greater recovery potential.

Who Administers the ASIA Exam — and When

The AIS assessment is a structured neurological examination performed by trained clinicians — typically a physiatrist, neurologist, or specialized rehabilitation physician. It is not a bedside impression; it follows a precise, standardized protocol developed by the American Spinal Injury Association.

The exam is typically administered:

• Within the first 72 hours after injury, once the patient is medically stable
• Again at 30 days post-injury, to detect changes
• At 90 days and one year, as part of rehabilitation tracking

Timing matters because spinal shock — a temporary suppression of reflex and motor activity following acute injury — can make a complete injury appear more severe than it ultimately is. Repeated testing over time provides a clearer picture of functional prognosis.

How the Examination Is Conducted 🩺

The ASIA exam follows a standardized sequence. The examiner tests:

1. Sensory Testing Two sensory modalities are checked at 28 defined points on each side of the body:

• Light touch (using a wisp of cotton)
• Pin prick (using a safety pin or specialized neurological pin)

Each point is scored 0 (absent), 1 (altered/impaired), or 2 (normal). A separate score is assigned for each side of the body.

2. Motor Testing Ten key muscle groups are tested bilaterally — five in the upper extremities, five in the lower. Each is graded on a 0–5 scale:

• 0 = Total paralysis
• 1 = Palpable or visible contraction
• 2 = Active movement, gravity eliminated
• 3 = Active movement against gravity
• 4 = Active movement against some resistance
• 5 = Active movement against full resistance (normal)

3. Neurological Level of Injury (NLI) Once sensory and motor data are recorded, the examiner identifies the lowest spinal segment where both sensation and motor function are normal on both sides. This is expressed as a spinal level — for example, C5, T4, or L2.

4. Sacral Sparing Assessment The distinction between complete and incomplete injury depends on sacral sparing — the presence of any sensation or voluntary motor function at the sacral segments (S4–S5). This includes:

• Sensation in the perianal area
• Voluntary anal sphincter contraction

The presence of either confirms an incomplete injury, regardless of motor or sensory loss elsewhere.

Why the AIS Classification Matters in Injury Claims

In catastrophic injury cases arising from motor vehicle accidents, the AIS grade becomes a central piece of clinical documentation. Here's how it intersects with the claims process:

• Medical cost projections — AIS grade informs lifetime care needs, including rehabilitation, attendant care, equipment, and hospitalizations. The difference between AIS A and AIS D can mean millions of dollars in projected costs.
• Expert testimony — Physicians and life care planners frequently reference AIS classification when presenting damages to insurers or juries.
• Settlement calculations — Insurers and attorneys on both sides use neurological classification to anchor economic and non-economic damage estimates.
• Prognosis disputes — Because incomplete injuries carry higher recovery potential, the AIS grade at various time points is sometimes disputed between parties' medical experts.

Variables That Shape How This Plays Out in a Claim ⚖️

How AIS classification factors into a specific claim depends on factors that vary considerably:

• State tort law — Some states cap non-economic damages in personal injury cases; others do not
• Coverage limits — A defendant's liability policy limits may be far below projected lifetime care costs
• Fault rules — Pure comparative fault, modified comparative fault, and contributory negligence states treat shared fault differently
• Timing of examination — A classification taken during spinal shock may not reflect the patient's ultimate neurological status
• Attorney involvement — Whether and how medical evidence is presented, and which experts are retained, shapes how AIS findings are used in litigation

The level of injury, the completeness classification, and how that grade changes over time are all factored into what different parties argue the case is worth — and they rarely agree.

What This Means for the Reader's Situation

The ASIA Impairment Scale produces objective, standardized data — but how that data is interpreted, documented, and applied in a specific claim depends entirely on state law, the applicable insurance coverage, and the facts of the accident. A C6 AIS B injury in a no-fault state with $250,000 in PIP coverage is a very different legal and financial situation than the same injury in an at-fault state with a defendant carrying minimum liability limits.

The clinical picture is only one piece of what shapes outcomes after a catastrophic spinal cord injury claim.