AI-004 — Causation and Pre-Existing Condition
Causation and Pre-Existing Condition
Damage identified after an incident is not necessarily damage caused by that incident.
A technical assessment must consider whether the reported event caused new damage, worsened an existing condition, or simply led to a condition being discovered.
This distinction may affect the proposed repair scope, the interpretation of an estimate and the information relied upon by the responsible parties.
What is a pre-existing condition?
A pre-existing condition is damage, deterioration, wear, corrosion, previous repair work or another physical condition that existed before the reported incident.
It may include earlier impact damage, worn components, fluid leaks, fatigue cracking, corrosion, existing paint defects, previous structural repairs or mechanical and electrical faults.
The existence of a pre-existing condition does not automatically resolve the causation question. The assessment must still consider whether the reported incident caused additional damage, worsened the condition or merely led to its discovery.
How causation is examined
Technical causation is examined by comparing the reported event with the available physical and documentary evidence.
Relevant considerations may include the direction and point of impact, likely force transfer, damage patterns, component deformation, fracture characteristics, previous repairs, diagnostic information and the condition of adjoining areas.
The central question is whether the nature, location and severity of the identified damage are technically consistent with the reported event.
When an Incident Worsens an Existing Condition
Causation is not always an all-or-nothing question.
A component may already be worn, weakened or previously repaired and then sustain additional damage during a later incident.
Where reasonably possible, the assessment should distinguish the earlier condition from the new damage and explain whether the incident worsened or accelerated an existing failure. If the available evidence does not allow a reliable separation, that limitation should be clearly recorded.
Why Further Investigation May Be Required
Some causation questions cannot be resolved through external photographs or an initial visual inspection.
Further investigation may require controlled dismantling, cleaning, measurement, diagnostic scanning, mechanical or electrical testing, manufacturer information or specialist examination.
The condition of the affected components should be properly documented before and during this work so that important evidence is not altered or lost.
Evidence May Change the Assessment
An assessment reflects the evidence available at a particular point in time.
An initial opinion may need to be reconsidered when dismantling reveals concealed damage, earlier records establish a pre-existing condition or testing provides new technical information.
Revising an assessment in response to credible additional evidence is not necessarily inconsistency. It demonstrates that the conclusion is being tested against the developing evidence.
What an Independent Assessment Can Establish
An independent technical assessment may record the condition before further work occurs, separate the reported history from verified observations and compare the identified damage with the mechanics of the incident.
It may support the commissioning party’s position, support an alternative explanation or establish that the available evidence is insufficient to determine causation reliably.
The purpose is not to produce a preferred conclusion. It is to explain what the evidence supports, what remains uncertain and whether further investigation is required.
Professional Boundary
Corsa Dynamics provides technical assessment and opinion based on the evidence available.
We do not determine insurance policy coverage, legal liability or whether a financial settlement should be accepted. Those decisions remain with the insurer, legal adviser, contracting parties or relevant decision-maker.
Our role is to explain what the physical and documentary evidence supports and to identify any material limitations affecting the assessment.
Key Point
A condition discovered after an incident is not automatically damage caused by that incident.
A sound causation assessment considers the reported event, the physical damage pattern, the vehicle or equipment history, any pre-existing condition and any later evidence before reaching a technical conclusion.