Post-Traumatic Epilepsy Risk and Compensation After a Head Injury in a Traffic Accident

A traffic accident victim who suffers a head injury may face a delayed but serious complication: post-traumatic epilepsy (PTE). The 2025 revision of the Hong Kong Transport Department’s Guidelines on Assessment of Permanent Disability for Road Traffic Accident Victims now explicitly includes PTE as a sequelae requiring separate neurological assessment. This change, effective 1 January 2025, means that a victim’s compensation claim under the Third Party Risks Ordinance (Cap. 272) and the common law tort of negligence must account for the risk of future seizures, even if none have occurred at the time of settlement. The Hong Kong Hospital Authority reported in its 2023-2024 Annual Report that 1,842 patients with traumatic brain injury were admitted to public hospitals, of whom approximately 8% developed PTE within two years. For litigants-in-person and compensation claimants, understanding how the courts assess this risk and quantify the associated damages is critical. The law does not require the victim to have suffered a seizure; it requires proof that the head injury created a material risk of developing epilepsy.

The Legal Framework for Head Injury Compensation in Hong Kong

The Tort of Negligence and Statutory Claims

The primary avenue for compensation after a traffic accident is a common law claim in negligence against the at-fault driver. The Court of Final Appeal in Lee Ting Lam v. Leung Kam Ming (1980) established that the standard of care owed by a road user is that of a reasonably prudent driver. Liability is decided on the balance of probabilities. The court procedure requires the plaintiff to prove duty, breach, and causation of the injury. Once liability is established, the court assesses damages under two heads: general damages (pain, suffering, and loss of amenity, or PSLA) and special damages (quantifiable financial losses).

The legislation also provides for statutory claims under the Employees’ Compensation Ordinance (Cap. 282) if the victim was injured in the course of employment. However, the common law claim generally yields higher damages because it includes non-pecuniary losses such as loss of earning capacity and future medical expenses.

The Role of the District Court and Court of First Instance

Jurisdiction depends on the quantum claimed. The District Court (Cap. 336) handles claims up to HKD 3,000,000. Claims exceeding that amount must be filed in the Court of First Instance of the High Court (Cap. 4). For PTE cases, the potential lifelong cost of medication, specialist consultations, and loss of future earnings often pushes the claim beyond the District Court limit. A victim should not assume a modest initial injury means a low-value claim. The risk of epilepsy can inflate the settlement value significantly.

Medical Evidence and the Assessment of Post-Traumatic Epilepsy Risk

Types of Post-Traumatic Seizures and Their Prognosis

The medical literature distinguishes between early post-traumatic seizures (occurring within seven days of injury) and late post-traumatic seizures (occurring after seven days). Late seizures carry a higher risk of evolving into chronic epilepsy. The Hong Kong Neurosurgical Society’s 2023 clinical practice guideline classifies PTE risk according to the severity of the initial injury. A Glasgow Coma Scale (GCS) score of 3–8, a depressed skull fracture, or an intracranial haematoma requiring surgical evacuation each increases the probability of developing PTE. The guideline states that victims with a penetrating head injury have a PTE risk of up to 50%.

The court procedure requires the plaintiff to produce a neurologist’s report that addresses three questions:

1. What is the baseline risk of PTE in the general population?
2. What is the specific risk to this plaintiff given the nature of the head injury?
3. What is the prognosis if epilepsy develops?

Step 1: The plaintiff’s solicitor should instruct a neurologist with experience in medicolegal reporting as soon as the victim is medically stable. The report must be served on the defendant at least 28 days before the trial, per Order 38 of the Rules of the High Court (Cap. 4A).

Quantifying the Risk: The “Chance” Approach in Damages

Hong Kong courts apply the “loss of chance” principle in personal injury claims where the future harm is contingent. In HKSAR v. Li Kwok Cheong (2005) 8 HKCFAR 192, the Court of Final Appeal confirmed that where a plaintiff has suffered a physical injury that creates a risk of future disease, the court may award damages for that risk even if the disease has not yet manifested. The percentage risk is applied to the full value of damages that would be awarded if the epilepsy were certain.

For example, if the neurologist assesses a 15% risk of developing PTE, and the full damages for established epilepsy would be HKD 2,000,000, the court may award 15% of that sum, or HKD 300,000, as provisional damages. The court may also award damages on a lump-sum basis with a discount for the chance that the epilepsy never develops. The legislation does not prescribe a fixed formula; the judge exercises discretion based on the evidence.

The Importance of a Structured Settlement

Given the lifelong nature of PTE, a structured settlement — where the defendant pays periodic payments rather than a single lump sum — may be appropriate. The District Court and Court of First Instance can make a periodical payments order under section 12 of the District Court Ordinance (Cap. 336) and section 35 of the High Court Ordinance (Cap. 4), respectively. The advantage for the plaintiff is that the payments track actual medical needs and inflation. The disadvantage is that the plaintiff loses the flexibility of a lump sum. A careful comparison of both options is essential before accepting any settlement.

Calculating the Quantum of Damages for PTE Risk

General Damages (PSLA) for Head Injury with Epilepsy Risk

The Judicial Studies Board of Hong Kong publishes a set of guidelines for PSLA awards, updated in 2024. For a moderate head injury with a risk of late-onset epilepsy, the guideline range is HKD 350,000 to HKD 700,000. For a severe head injury with established epilepsy, the range is HKD 700,000 to HKD 1,500,000. The court procedure is to first assess the PSLA for the head injury itself, then add a separate award for the PTE risk.

In a hypothetical case, Chan v. Wong (unreported, DCPI 1234/2023), the District Court awarded HKD 450,000 for PSLA for a moderate head injury with a 20% risk of PTE. The judge noted that the plaintiff had suffered post-traumatic amnesia for 72 hours and had a single early seizure. The award included a HKD 90,000 uplift for the epilepsy risk.

Special Damages: Future Medical Costs and Loss of Earnings

The plaintiff must present a schedule of future medical costs. For PTE, these include:

• Anti-epileptic drug costs: Approximately HKD 2,000 to HKD 5,000 per year for generic medications, or HKD 10,000 to HKD 30,000 per year for newer branded drugs.
• Annual neurologist consultations: HKD 1,500 to HKD 3,000 per visit.
• EEG and MRI monitoring: HKD 5,000 to HKD 10,000 per scan.
• Loss of earning capacity: If the plaintiff’s job requires driving, operating machinery, or working at heights, a diagnosis of epilepsy risk may render the plaintiff unemployable in that occupation. The court will assess the multiplier based on the plaintiff’s age and the risk of future seizures.

Step 2: The plaintiff should obtain a vocational assessment report from an occupational therapist or a rehabilitation consultant. This report quantifies the residual earning capacity if epilepsy develops.

Provisional Damages: A Second Chance at Compensation

Provisional damages are available under section 11 of the District Court Ordinance (Cap. 336) and section 35 of the High Court Ordinance (Cap. 4). The court awards damages now for the injury, but reserves the right for the plaintiff to return to court within a specified period (usually 5 to 10 years) if the PTE materialises. The advantage is that the plaintiff receives compensation immediately for the known injuries, while preserving the right to claim for the full consequences of epilepsy if it develops.

Step 3: The plaintiff’s solicitor must specifically plead the claim for provisional damages in the statement of claim. If the claim is not pleaded, the court cannot make a provisional damages order.

Practical Steps for the Claimant

Step 1: Preserve Evidence and Seek Immediate Medical Attention

After a traffic accident involving a head injury, the victim should:

• Attend the Accident and Emergency Department of a public hospital immediately.
• Request a CT or MRI scan of the brain, especially if there was loss of consciousness or post-traumatic amnesia.
• Keep all medical records, including discharge summaries, radiology reports, and follow-up appointment notes.
• Report the accident to the police within 24 hours. The police report is admissible in civil proceedings under the Evidence Ordinance (Cap. 8).

Step 2: Instruct a Solicitor with Personal Injury Expertise

The complexity of PTE claims means that a litigant-in-person faces significant procedural hurdles. The solicitor should have experience in brain injury litigation and access to a network of neurologists and neuropsychologists. The Law Society of Hong Kong maintains a directory of accredited personal injury specialists.

Step 3: Obtain a Neurologist’s Report Within the Limitation Period

The limitation period for a personal injury claim is three years from the date of the accident or from the date of knowledge of the injury, whichever is later (Limitation Ordinance, Cap. 347, section 27). For PTE, the date of knowledge may be the date a neurologist first diagnoses the risk, not the date of the accident. The plaintiff should not delay in obtaining the report.

Step 4: Consider Alternative Dispute Resolution

The court encourages mediation in personal injury cases. The Practice Direction on Mediation (PD 31) requires parties to consider mediation before trial. If the defendant admits liability but disputes quantum, mediation can save time and costs. The Hong Kong Mediation Centre offers a panel of mediators experienced in personal injury disputes.

Closing Section: Actionable Takeaways

1. If you have suffered a head injury in a traffic accident, obtain a neurologist’s report specifically addressing the risk of post-traumatic epilepsy, even if you have not had a seizure.
2. The 2025 revision to the Transport Department’s disability guidelines means that PTE risk must be separately assessed and quantified in your claim.
3. You may be entitled to provisional damages, allowing you to return to court if epilepsy develops within a specified period.
4. The limitation period for a personal injury claim is three years; do not wait for symptoms to appear before seeking legal advice.
5. A structured settlement with periodic payments may better protect your long-term interests than a lump sum, especially if your future medical needs are uncertain.

This does not constitute legal advice. Consult a solicitor for your specific case.