Instructing a TBI Expert Witness: Key Considerations for Solicitors

Traumatic brain injury (TBI) in abuse claims presents complex medico-legal challenges. Whether resulting from physical violence, institutional neglect or other abuse forms, TBI often intersects with psychiatric, psychological and paediatric evidence. For solicitors handling civil claims, Criminal Injuries Compensation Authority (CICA) matters or group litigation, instructing a traumatic brain injury expert witness with trauma-informed experience is crucial for establishing causation, prognosis and quantum.

1. Clinical Context: TBI in Abuse Claims

TBI in abuse cases may result from direct assault, shaking (particularly in children) or secondary mechanisms like hypoxia following strangulation. Clinical presentations vary widely, from mild concussion to severe cognitive impairment. TBI rarely occurs in isolation in medico-legal practice, frequently co-occurring with:

• Post-traumatic stress disorder (PTSD) under DSM-5 or ICD-11
• Complex PTSD (CPTSD) with emotional dysregulation and relational difficulties
• Depressive and anxiety disorders exacerbated by cognitive deficits
• Dissociative symptoms complicating memory assessment
• Paediatric presentations including developmental trauma and attachment disruption

Medico-legal experts must distinguish between cognitive deficits from TBI and psychological trauma symptoms, while recognising potential overlap.

Paediatric Considerations

In children, TBI may present as non-accidental injury (NAI), raising safeguarding concerns. Assessments must account for:

• Developmental stage and neuroplasticity affecting recovery
• Disclosure delays due to cognitive or emotional limitations
• Attachment disruption impacting presentation and account reliability
• Achieving Best Evidence (ABE) interview context

Paediatric experts assess these within safeguarding frameworks, considering systemic failures as highlighted in Armes v Nottinghamshire County Council [2017] UKSC 60.

2. Legal Relevance: TBI Evidence in Proceedings

The role of TBI expert evidence varies by case type and stage:

Civil Claims

TBI evidence may be required for:

• Liability and Causation: Establishing abuse-TBI link, particularly with pre-existing conditions. The eggshell skull rule (Smith v Leech Brain & Co Ltd [1962] 2 QB 405) may apply.
• Quantum: Assessing long-term cognitive impact, capacity and care needs through Condition and Prognosis reports.
• Limitation: Informing Section 33 discretion where cognitive impairment caused delayed disclosure (A v Hoare [2008] UKHL 6).

CICA Claims

Key considerations include:

• Mental injury tariffs may not fully capture TBI impairments
• Post-2019 same-roof rule reforms affecting historic claims
• Cognitive impairment as “good reason” for delayed applications

Experts help frame presentations within CICA’s tariff framework.

Group Litigation

TBI evidence may establish:

• Systemic safeguarding failures (Various Claimants v Barclays Bank plc [2020] UKSC 12)
• Vicarious liability (Mohamud v WM Morrison Supermarkets plc [2016] UKSC 11)
• Human Rights Act breaches (Michael v Chief Constable of South Wales Police [2015] UKSC 2)

Single Joint Experts (SJEs) may be used under CPR Part 35.

3. Common Challenges in TBI Evidence

Diagnostic Considerations

Assessments must distinguish between:

• Cognitive deficits from brain injury
• Psychological trauma symptoms
• Pre-existing conditions

Standardised tools like Glasgow Coma Scale or Rivermead Post-Concussion Symptoms Questionnaire support conclusions.

Causation Issues

Challenges include:

• Delayed medical attention
• Lack of contemporaneous records
• Alternative explanations for impairment

Experts review all evidence, considering temporal relationships and symptom consistency.

Symptom Validity

Defence may raise malingering concerns, particularly with:

• Inconsistent symptom accounts
• Lack of objective evidence
• Financial incentives

Validated tools like TOMM or MMPI-2-RF assess validity, though trauma presentations require careful interpretation.

4. Expert Witness Roles

Common report types include:

• Liability/Causation Reports: Linking abuse to TBI
• Condition/Prognosis Reports: Current presentation and outlook
• Quantum/Care Needs Reports: Financial and care requirements
• SJE Reports: Impartial evidence for both parties
• Court of Protection Reports: Capacity assessments

Trauma-Informed Approach

Experts should:

• Recognise dissociative symptoms affecting engagement
• Use phased assessments prioritising safety
• Avoid re-traumatisation through sensitive questioning
• Collaborate with other specialists for complex cases

5. Practical Guidance for Solicitors

Instruction Timing

Early instruction is advisable for:

• Complex trauma presentations
• Safeguarding concerns
• Limitation issues
• Group litigation

Required Records

Provide comprehensive records including:

• Medical and educational records
• Social services documentation
• Witness statements
• Previous expert reports
• Police records where relevant

Claimant Preparation

Ensure trauma-informed preparation:

• Explain assessment purpose clearly
• Allow breaks during assessment
• Provide process information
• Offer support during assessment
• Address claimant concerns

Report Expectations

Quality reports should:

• State expert qualifications
• Summarise records reviewed
• Provide detailed clinical assessment
• Address instruction questions
• Distinguish TBI from psychological symptoms
• Assess functional impact
• Provide prognosis
• Adhere to CPR Part 35

Conclusion

Instructing TBI experts in abuse claims requires understanding clinical, legal and procedural complexities. TBI often intersects with psychiatric and paediatric factors, demanding trauma-informed, multi-disciplinary approaches. Early specialist instruction strengthens claims, particularly with complex trauma or safeguarding concerns. By understanding expert roles, common challenges and preparation requirements, solicitors can ensure robust, legally defensible evaluations for their clients.