Changing an opinion does not automatically suggest inconsistency. The important question is whether the expert can explain what changed and why.
New Evidence Can Alter the Clinical Picture.
An original opinion may rely on incomplete records or information available during the first assessment. Later evidence can provide a clearer baseline or reveal facts that were previously unknown.
Earlier medical records may identify similar symptoms before the accident. New imaging may show pathology that changes the diagnosis. Specialist assessment may provide a more persuasive explanation for continuing symptoms.
Treatment response can also affect prognosis. Someone expected to recover after rehabilitation may remain significantly restricted despite appropriate treatment.
The expert should consider whether the new material affects diagnosis, causation, function, treatment recommendations, or prognosis. Not every new document requires a changed conclusion.
Sometimes additional evidence simply strengthens the original opinion.
Changing an Opinion Is Not a Failure.
Experts should not feel compelled to defend an earlier conclusion when better evidence points elsewhere. Clinical judgement should remain responsive to relevant information.
A report represents an opinion based on the evidence available at that stage. It does not freeze the expert’s reasoning permanently.
The difficulty arises when an opinion changes without explanation. A substantial change in diagnosis or causation deserves more than a revised sentence.
The expert should identify the new evidence and explain how it alters the reasoning. This allows the parties to understand the difference between genuine reconsideration and unexplained inconsistency.
A transparent change can strengthen credibility because it shows that evidence matters more than defending an earlier position.
The New Evidence Must Actually Matter.
Not every additional record changes the opinion. Experts should distinguish genuinely material information from evidence that adds detail without altering the analysis.
A later GP entry recording continuing pain may confirm what the expert already knew. It may therefore leave prognosis unchanged.
By contrast, records showing significant pre-accident symptoms could materially alter causation. A new neurological diagnosis may also require the original explanation to be reconsidered.
The expert should ask a simple question: would this information have changed the original opinion if it had been available earlier?
If the answer is no, the report can say so. If the answer is yes, the reasoning should explain the effect.
Causation May Need Reconsideration.
New evidence can be particularly important when it changes the pre-accident baseline. Earlier symptoms, treatment, medication, or previous injuries may alter the causal analysis.
The accident may still have caused a new condition. Alternatively, it may have aggravated an existing problem or produced only temporary deterioration.
Later events can create similar difficulty. A second accident, illness, or unrelated injury may contribute to continuing symptoms.
The expert should avoid forcing the original causation opinion to survive when the evidence no longer supports it. Equally, latest information should not automatically displace the first accident.
The revised opinion should explain the contribution of each relevant factor.
Prognosis Can Change Without Diagnosis Changing.
New evidence does not need to alter diagnosis before it affects prognosis. Recovery itself provides information that was unavailable at the first examination.
A person may improve faster than expected, making the original prognosis unnecessarily cautious. Another may fail to improve despite appropriate treatment.
Further rehabilitation, surgery, psychological treatment, or specialist assessment may also change the expected recovery pattern.
The expert should therefore review the assumptions behind the original prognosis. If those assumptions no longer hold, the recovery estimate may change.
An updated opinion should explain what happened since the earlier report and why that matters clinically.
The Expert Should Correct the Record Clearly.
Where the change matters, the expert should state it openly rather than quietly altering the wording. An addendum or supplementary report may provide the clearest approach.
The new document should identify the additional evidence, reconsider the relevant issues, and state whether the original conclusions remain unchanged.
Where the opinion changes, the expert should explain the extent of that change. Diagnosis may remain the same while prognosis changes, or causation may need substantial revision.
Clear reasoning matters more than defending consistency for its own sake.
Independence Includes the Ability to Reconsider.
An expert’s responsibility is to provide the best clinical opinion that the available evidence supports. That responsibility continues after the first report.
New evidence may strengthen the original view, qualify it, or require a different conclusion. Each outcome can be appropriate when the reasoning remains evidence based.
A credible expert does not change position simply because one party prefers another answer. Equally, they should not retain an opinion merely because they expressed it earlier.
The stronger approach is straightforward. Review the new material, identify what it changes, and explain the revised reasoning clearly.
Changing an opinion can therefore demonstrate independence rather than weakness. The problem is not reconsideration; it is changing without a defensible clinical reason.
