When a client continues to experience neck pain after a motor vehicle collision, the medical records may still describe the condition as little more than a sprain, strain, or soft-tissue injury.
For attorneys, that creates an immediate challenge.
Pain complaints may be real, but if the records do not identify the full extent of the injury, the claim may be evaluated without important medical information. In cervical trauma cases, one of the most significant findings that may be overlooked is Alteration of Motion Segment Integrity, or AOMSI.
When AOMSI is properly identified and documented under the AMA Guides to the Evaluation of Permanent Impairment, it can provide objective support for the severity, permanency, and valuation of a cervical spine injury.
An Impairment Rating Provides More Than a Description of Pain
The AMA Guides use Diagnosis Related Estimate, or DRE, categories to classify spinal injuries according to Whole Person Impairment.
A cervical ligament tear may also be described as ligament laxity, loss of segment integrity, abnormal translation between adjacent vertebrae, abnormal angular motion, or AOMSI. Under the framework described in the AMA Guides, this type of injury falls within DRE Category IV and is considered one of the more serious spinal injury classifications.
That distinction matters in a personal injury case.
A general diagnosis of cervical sprain or strain does not communicate the same level of injury as a finding that the ligaments responsible for stabilizing the cervical spine have been damaged. When those ligaments no longer control motion normally, the result may be permanent instability between vertebral segments.
For an attorney, the impairment rating helps translate that medical finding into a standardized classification that can be explained to an adjuster, mediator, or jury.
Why the 25% to 28% Rating Matters
The AMA Guides recognize cervical translation greater than 3.5 millimeters as a DRE Category IV permanent impairment carrying a 25% to 28% Whole Person Impairment rating. That is the same percentage of impairment assigned to a patient who has undergone surgery to fuse two cervical vertebrae.
This comparison can be especially useful when presenting the seriousness of the condition.
Terms such as ligament laxity, translation instability, and motion segment integrity may be unfamiliar to jurors. A comparison to a post-surgical cervical fusion provides context. It helps demonstrate that the finding is not being treated as a temporary muscle injury, but as a permanent loss of normal spinal stability.
The AMA Guides also place AOMSI in the same category as a severe spinal compression fracture involving more than 50% vertebral collapse and congenital or surgical spinal fusion.
For attorneys, this gives the injury a recognized medical framework rather than leaving its seriousness open to competing descriptions.
Why AOMSI Is Frequently Overlooked
One of the central problems in cervical injury cases is that AOMSI may not be visible to the human eye.
The abnormal movement must be measured through Radiographic Mensuration Analysis, also called Computerized Radiographic Mensuration Analysis or Digital Radiographic Mensuration Analysis. The process evaluates the relationship and movement between adjacent vertebrae.
Manual measurements using George’s Line were reported to have a 26% error rate. Computerized measurement is described as being accurate to within 0.01 millimeters and 0.01 degrees, with a basically negligible error rate.
This explains why a client may have continuing symptoms even though prior imaging has not identified a significant structural injury.
The issue may not be that the injury is absent. The issue may be that the appropriate measurement was never performed.
For attorneys reviewing a cervical trauma case, that raises several important questions:
- Were flexion and extension radiographs obtained?
- Were the vertebral segments measured?
- Was Radiographic Mensuration Analysis performed?
- Did the measurements satisfy the AMA criteria for AOMSI?
- Was an impairment rating included in the medical records?
Without those steps, the medical file may not fully describe the client’s cervical injury.
The Rating Must Be Supported by the Right Documentation
A percentage alone will not make an impairment opinion persuasive.
The AMA Guides have strict criteria for diagnosing AOMSI. The individual findings supporting the diagnosis should be documented and presented clearly so that the attorney can use them in representing the claim.
The supporting data should identify:
- The injury type
- The applicable edition of the AMA Guides
- The relevant chapter
- The applicable table
- The page containing the assessment criteria
- The resulting Whole Person Impairment rating
Presenting the information in table format creates a direct connection between the objective findings and the impairment classification. It also helps organize the evidence in a way that can address competing medical opinions and support the greater weight of the evidence.
For an attorney, this can be far more useful than a narrative report that simply concludes the client has a permanent injury.
A properly documented report shows the entire process:
- The collision produced cervical trauma.
- The physician suspected ligament injury or instability.
- Appropriate motion studies were obtained.
- The vertebral movement was measured.
- The findings were compared with the AMA criteria.
- The qualifying impairment rating was assigned.
That sequence gives the opinion a foundation that can be explained during negotiation, deposition, or trial.
How the Impairment Rating Can Affect Case Valuation
The failure to diagnose AOMSI may result in the loss of important valuation information.
A former Superintendent of Insurance at Allstate, James Mathis, stated that an AOMSI diagnosis assigns a case settlement reserve value of $66,000.
The Whole Person Impairment rating is also described as carrying significant value within the claim evaluation process. In a Colossus accident claim, the impairment rating is identified as carrying 25% of the medical claim’s worth.
The practical issue for attorneys is whether the adjuster is evaluating the claim based on a general sprain-and-strain diagnosis or based on a documented, permanent ligament injury with a recognized impairment rating.
The medical record drives that distinction.
Several reported AOMSI cases illustrate how the claim outcome changed after the injury was documented and presented:
- A $7,000 initial offer followed by a $100,000 jury award after a successful Daubert challenge
- A $7,000 initial offer followed by a $75,000 jury award
- A $40,000 initial offer followed by a $212,000 result after deposition
- An $11,000 initial offer followed by a $42,000 result after deposition
These examples demonstrate why a missed impairment diagnosis may affect more than the treatment plan. It may affect how the entire claim is evaluated.
The AMA Guides Can Improve Credibility in Court
A well-supported impairment opinion gives the attorney more than a number. It provides a method.
The physician should be able to explain:
- What injury was identified
- Which objective findings support it
- How the measurements were performed
- Which AMA criteria were applied
- Why the findings qualify as AOMSI
- How the Whole Person Impairment rating was calculated
The physician is expected to use the chapter, table, page, or method in the AMA Guides that most accurately reflects the injured person’s impairment. The resulting opinion must be supported by substantial evidence.
That preparation becomes critical during deposition or cross-examination.
When opposing counsel asks why the injury was not seen on the original films, the expert should be able to explain that the condition required specialized computerized measurement. When asked whether the rating is merely an opinion, the expert should be able to identify the precise AMA criteria and objective measurements supporting it.
This is where the AMA Guides can strengthen credibility. The opinion is tied to a recognized process rather than resting only on symptoms or general clinical impressions.
What Attorneys Should Review Before Valuing the Case
Before accepting the characterization of a cervical injury as a routine soft-tissue claim, review whether the medical records address spinal ligament integrity.
Ask whether the physician:
- Considered AOMSI
- Ordered appropriate motion radiographs
- Obtained computerized mensuration analysis
- Documented abnormal translation or angular motion
- Applied the appropriate DRE category
- Assigned and supported a Whole Person Impairment rating
- Clearly communicated the findings to counsel
Claim adjusters and attorneys use the facts contained in the medical chart as the basis for evaluating a personal injury settlement. A jury also needs to understand whether the injured person has this condition when deciding damages.
If the necessary testing was never ordered, the case may be missing objective evidence of a permanent injury.
The Bottom Line
The AMA Guides can strengthen a cervical spine injury case by converting measured clinical findings into a recognized impairment classification.
When cervical translation meets the criteria for AOMSI, the resulting 25% to 28% Whole Person Impairment rating provides important context for the seriousness and permanency of the injury. It places the condition within the same impairment range as a two-level cervical fusion and within the same DRE category as other severe spinal injuries.
For attorneys, the real value lies in the combination of objective measurement, strict diagnostic criteria, organized documentation, and a medical expert who can explain the findings clearly.
When those elements are present, the cervical injury is no longer presented as an unexplained complaint of neck pain. It is presented as a documented impairment supported by measurable evidence.
Dr. Richard Falcone provides case reviews and expert witness services for attorneys handling whiplash and cervical spine injury matters in Allegheny County, Pennsylvania.