Statement of Principles concerning concussion (Reasonable Hypothesis) (No. 92 of 2018)

The instrument deploys a compact set of legal and medical concepts that control its application. Primary among them are the statutory source and scope (s 3 and s 5), the medical definition of the injury (s 7(2)), the causal threshold for administrative decision‑making (the "reasonable hypothesis"), and the discrete factors listed as necessary to raise that threshold (s 9).

"Concussion" is defined for the instrument as a mild traumatic brain injury caused by transfer of kinetic energy to the brain from external physical forces, manifested by a temporary disturbance in neurological function that does not meet criteria for moderate to severe traumatic brain injury (s 7(2)). The definition explicitly excludes injuries caused by radiation, electricity, heat and surgery (s 7(2)(b)). This medical definition focuses on mechanism and clinical severity thresholds; it does not attempt to specify diagnostic tests or timelines beyond the phrase "temporary disturbance in neurological function" (s 7(2)(a)).

"Death from concussion" is captured where a terminal event or condition was contributed to by the person’s concussion (s 7(3)). The Schedule defines "terminal event" by reference to proximate or ultimate causes of death, and gives examples such as pneumonia, respiratory failure, cardiac arrest, circulatory failure, and cessation of brain function (Schedule, terminal event). That framing makes the instrument relevant to claims where a later terminal event is said to have been contributed to by an earlier concussion (s 7(3)).

The statutory causal standard used is the "reasonable hypothesis". The Authority prescribes the minimum factual factors which must exist to raise that hypothesis: either a "specified event" occurring at the time of clinical onset of concussion, or an inability to obtain appropriate clinical management for concussion (s 9). The Schedule defines "specified event" as one of four alternatives: the head being struck by an object, the head striking an object, the brain undergoing acceleration/deceleration without direct external trauma, or an explosion or explosive blast (Schedule, specified event). The "inability to obtain appropriate clinical management" factor is not further defined in the instrument; its application is therefore left to decision‑makers to assess on the available evidence (s 9(2)).

"Relevant service" is a crucial administrative concept governing which persons and which service categories are within the instrument’s scope. The Schedule lists kinds of relevant service under the VEA and MRCA, including operational, peacekeeping, hazardous, British nuclear test defence service, warlike and non‑warlike service (Schedule, relevant service). Section 10 requires that any factor identified under s 9 must be related to the person’s relevant service. Section 10(2) narrows the reach of the second factor: inability to obtain appropriate clinical management is said to apply only to material contribution to, or aggravation of, concussion where the concussion was suffered or contracted before or during but did not arise out of relevant service. Finally, section 11 provides that where a factor refers to an injury or disease covered by another SoP, the factors in that other SoP apply according to its terms.

These main concepts are compact but precise, isolating the condition, defining the causal standard, and setting the alternative factual pathways for raising a reasonable hypothesis. Where the instrument is silent, it delegates factual assessment and application to the decision‑making processes that adjudicate the relevant VEA or MRCA claims, referencing other SoPs when cross‑conditions are implicated (s 11).

The instrument is addressed to claims under the VEA and the MRCA and therefore affects persons who bring or are eligible to bring those claims. It applies specifically to a claim "to which section 120A of the VEA or section 338 of the Military Rehabilitation and Compensation Act 2004 applies" (s 5). The Authority’s statement that concussion and death from concussion can be related to "veterans, members of Peacekeeping Forces, or members of the Forces under the VEA, or members under the MRCA" (s 8) signals the classes of persons whose conditions the SoP contemplates.

Schedule 1 frames "relevant service" by reference to specific categories. Those categories include operational, peacekeeping, hazardous, British nuclear test defence service, warlike, and non‑warlike service (Schedule, relevant service). Therefore the instrument’s scope is not universal; it is limited to people whose concussion is being asserted in the context of those service types as relevant service for a claim under the specified statutory sections.

Who decides, administratively, is implicit in the instrument’s statutory mechanics. The Repatriation Medical Authority determines the SoP (s 3). The SoP prescribes the medical‑scientific factors that must exist to raise a reasonable hypothesis that a person’s concussion or death from concussion is related to relevant service; decision‑makers hearing claims under the VEA or MRCA will apply the SoP’s factors in adjudicating those claims (s 5, s 9). The instrument itself does not name the decision‑maker who applies the SoP in each claim, it specifies the connection to the statutory claims framework.

Who pays is a matter of statutory entitlement once a claim succeeds under the relevant statutory provisions; the instrument itself does not set monetary payments or charging schemes. Practically, the primary immediate actors affected are claimants who must align their medical and factual evidence with the instrument’s factors, and administrative decision‑makers who must assess whether the factual material raises the reasonable hypothesis per s 9 and whether those factors relate to relevant service per s 10. The instrument also affects medical reporting and potentially the medical evidence collected and tendered in support of claims, because the legal test specified in s 9 requires evidence of either a specified event at clinical onset or inability to obtain appropriate clinical management.

For cases where the factors refer to an injury or disease that is governed by another SoP, the persons affected will be subject to the additional or different factors set out in that other SoP, as section 11 makes explicit. The cross‑reference mechanism therefore affects claimants whose presentation implicates other brain injuries or sequelae catalogued in other Statements of Principles.

The instrument does not impose statutory duties of conduct or confer procedural rights in a freestanding way; instead it prescribes the medical‑scientific factors that decision‑makers must use when determining whether a reasonable hypothesis has been raised linking concussion or death from concussion to relevant service. The operative duties and rights are therefore mediated through the claims framework of the VEA and MRCA to which it applies (s 5).

The key legal effect is that at least one factor listed in section 9 must exist as a minimum before a reasonable hypothesis can be said to be raised. Those two alternative factors are: (1) experiencing a specified event at the time of the clinical onset of concussion (s 9(1)), and (2) inability to obtain appropriate clinical management for concussion (s 9(2)). The Schedule defines "specified event" in four discrete alternatives, any one of which may establish that factor: the head being struck by an object, the head striking an object, the brain undergoing an acceleration or deceleration movement without direct external trauma to the head, or an explosion or explosive blast (Schedule, specified event).

Section 10 imposes a relational requirement: the existence of any factor in s 9 must be related to the relevant service rendered by the person (s 10(1)). That is, it is not enough that a specified event or a lack of clinical management occurred; there must be a relationship to the person’s relevant service as defined in the Schedule. The Schedule’s definition of relevant service lists the service categories (Schedule, relevant service). Section 10(2) further specifies that the inability to obtain appropriate clinical management factor (s 9(2)) applies only to material contribution to, or aggravation of, concussion where the concussion was suffered or contracted before or during, but did not arise out of, relevant service. That imposes a temporal and causal limitation on the second factor.

Section 11 creates a right or operative duty of cross‑application: if a factor in this SoP refers to an injury or disease which is governed by another SoP, then the factors in that other SoP apply according to its terms as in force from time to time (s 11). That means decision‑makers must consult and apply other relevant SoPs where the facts engage them.

The instrument gives no procedural mechanism for claimants to amend or challenge the SoP itself; the Repatriation Medical Authority is the statutory body that determines Statements of Principles (s 3). The Authority also asserts the evidentiary basis for the SoP in section 8, stating its view that there is sound medical‑scientific evidence linking concussion and death from concussion to relevant service. How that evidentiary view is operationalised in decision‑making is through the factors listed in s 9 and the relational test in s 10.

Because the SoP sets minimum factors for raising a reasonable hypothesis, it affects the evidentiary burden on claimants within the VEA/MRCA claims processes. It does not create standalone civil or criminal liabilities, nor does it stipulate benefit entitlement outcomes; those outcomes remain governed by the VEA and MRCA procedural and substantive rules once a reasonable hypothesis is established.

This instrument itself contains no penalty or criminal enforcement provisions. It is an administrative medical‑scientific instrument prescribed under subsection 196B(2) of the Veterans' Entitlements Act 1986 and functions as a causation guideline within the statutory claims framework. The text sets out how a "reasonable hypothesis" can be raised for the purposes of claims to which section 120A of the VEA or section 338 of the MRCA applies (s 5 and s 9). It does not create offences, fines, or enforcement procedures.

Enforcement in practical terms occurs through the application of the SoP by the decision‑making processes that adjudicate claims under the VEA and MRCA. The instrument obliges those decision‑makers to treat at least one of the factors in s 9 as a minimum basis for raising a reasonable hypothesis, subject to the relational requirements in s 10 and the cross‑application rule in s 11. The SoP therefore governs the threshold at which administrative decision‑makers must find that a reasonable hypothesis exists, but the instrument does not itself provide machinery for sanctions or direct enforcement actions beyond its use in claim determination.

Because the instrument prescribes a minimum evidentiary standard, its practical effect in claim processing can be enforcement‑like: a claim that does not show at least one of the s 9 factors related to relevant service will, under the decision framework to which the SoP applies, fail to meet the reasonable hypothesis threshold and thus be less likely to succeed on causation grounds. That operational consequence is a functional enforcement mechanism internal to the claims adjudication process, although the instrument does not create any penalty for failing to meet the factors.

Where a factor in this SoP refers to an injury or disease covered by another SoP, the applicable provisions of that other SoP must be applied "as in force from time to time" (s 11). This cross‑reference ensures that enforcement of causation standards is coordinated across Statements of Principles, but again, the coordination affects administrative determinations rather than imposing external penalties.

The instrument’s repeal clause (s 4) operates as a legislative enforcement mechanic by removing the prior SoP No. 64 of 2012 from force. That repeal has consequence for ongoing and future determinations: decision‑makers must apply the new SoP rather than the repealed text, from the commencement date onward (s 2 and s 4). The instrument itself does not address retrospective application to claims made before commencement; whether and how it applies to earlier claims will depend on the wider statutory and administrative rules under the VEA and MRCA, not on this SoP text.

This instrument is expressly made under subsection 196B(2) of the Veterans' Entitlements Act 1986 (s 3). Its declared statutory application is limited to claims that fall under section 120A of the VEA or section 338 of the Military Rehabilitation and Compensation Act 2004 (s 5). The instrument therefore integrates into the statutory adjudicative framework provided by those statutes by setting out the medical factors that amount to a "reasonable hypothesis" linking concussion or death from concussion to relevant service.

Section 11 creates a specific cross‑instrument interaction rule: where a factor in this SoP applies in relation to a person and that factor refers to an injury or disease governed by another SoP under subsection 196B(2) of the VEA, the factors in that other SoP apply "in accordance with the terms of that Statement of Principles as in force from time to time" (s 11). The instrument’s own Note under s 7 lists several other Statements of Principles where trauma to the brain is listed as a risk factor, including items such as epilepsy, subdural haematoma, and dementia pugilistica. That list, while non‑exhaustive, signals that the medical relationships between concussion and other brain injuries are handled through coordinated application of multiple SoPs (s 7 Note; s 11).

The Schedule defines "relevant service" by cross‑reference to service categories recognised under the VEA and MRCA, thus aligning the SoP with the service definitions used in those Acts (Schedule, relevant service). The instrument therefore operates as part of the interpretation and application of service connection within those Act frameworks.

The instrument does not change or amend the VEA or MRCA themselves. It does, however, repeal the earlier concussion SoP No. 64 of 2012 (s 4) and replaces it as the operative Statement of Principles for concussion. Decision‑makers must therefore apply the new text in place of the repealed instrument when adjudicating the relevant claims from the commencement date forward (s 2 and s 4).

Given the instrument’s reliance on other SoPs when a factor refers to another injury or disease (s 11), there is a dependency effect: the practical outcome for any particular claim may depend on the content and current force of other SoPs. The instrument instructs that those other SoPs apply "as in force from time to time" (s 11), so amendments to those other statements will change how cross‑referenced factors are treated. This creates a dynamic interaction where multiple SoPs, the VEA and the MRCA together determine the causation outcomes in claims involving concussion and related injuries.

The instrument does not specify procedural interactions such as appeals, time limits, or evidentiary rules; those procedural aspects remain governed by the VEA and MRCA and by administrative practice. The SoP is a focused medical‑scientific input to those processes, rather than a stand‑alone legal code.

The instrument records a limited self‑contained amendment history. It expressly repeals the earlier Statement of Principles concerning concussion No. 64 of 2012 (Federal Register of Legislation No. F2012L01809) made under subsection 196B(2) of the VEA (s 4). The instrument itself is dated 26 October 2018 and commences on 26 November 2018 (front matter and s 2). The instrument therefore replaced the 2012 SoP as of its commencement date.

No subsequent amendments or variations are recorded within the instrument text provided. The instrument contains the usual clause that it is made under subsection 196B(2) of the VEA (s 3), which is the statutory power for the Repatriation Medical Authority to determine Statements of Principles; that statutory power enables future determinations or amendments, but this instrument does not itself record any later changes.

The Schedule indicates that MRCA and VEA are defined within this instrument (Schedule). The instrument’s Note under s 7 lists other Statements of Principles that address brain trauma sequelae and which are relevant to cross‑application; those SoPs may themselves have separate amendment histories that would affect how cross‑referenced factors operate in practice (s 7 Note; s 11). The instrument instructs that factors in other SoPs apply "as in force from time to time" (s 11), which means any amendment to those other SoPs will take effect for cross‑referenced applications without further change to this instrument.

If a practitioner needs to trace the replacement or evolution of concussion‑related SoPs, the immediate concrete steps derivable from this text are: the 2012 SoP was repealed by s 4; the 2018 instrument took effect on 26 November 2018 (s 2); and any future changes to related SoPs will affect cross‑applications per s 11. The instrument does not provide a schedule of prior amendments beyond the single repeal it effects.

The instrument itself does not record any litigation history. It names no judicial decisions, and contains no references to case law or to prior determinations that have been litigated. The explanatory notes embedded in the instrument are limited to the Authority’s statement that it is "of the view that there is sound medical‑scientific evidence" linking concussion and death from concussion to relevant service (s 8). No cases are cited within the text.

Because this is a Statement of Principles made under a statutory power, disputes about its application are likely to arise in the context of adjudication of claims under the VEA and MRCA, and potentially in administrative or judicial review proceedings concerning claim determinations. However, the instrument itself does not record or summarise any such proceedings. The instrument’s cross‑reference provisions (s 11) and its repeal of the prior SoP (s 4) could be relevant issues in litigation, for example in questions about transition, the proper SoP to apply, or the correct interpretation of defined terms such as "specified event" or "relevant service", but the instrument does not contain factual or legal history of any cases.

Where a factor in this SoP refers to an injury or disease in respect of which another SoP applies, that other SoP may have its own litigation history that bears on interpretation and application. The instrument requires that the factors in such other SoPs be applied "as in force from time to time" (s 11), which may, in contentious cases, prompt litigation about which version applies and how its factors operate. Any historical litigation that has interpreted concussion, traumatic brain injury, or related SoPs is not summarised in this instrument.

Practitioners seeking litigation history relevant to application of this SoP must therefore consult external sources: the VEA and MRCA claims decisions, tribunal determinations and courts' decisions that address reasonable hypothesis, and any judicial commentary on the interplay between SoPs and claims adjudication. Those materials are outside the instrument text and are not contained in or cited by it.

This instrument is compact but contains several drafting points and limitations that can materially affect claims and decision‑making.

Narrow clinical scope. The SoP limits "concussion" to a mild traumatic brain injury resulting from transfer of kinetic energy to the brain from external physical forces, with a temporary disturbance in neurological function and not meeting criteria for moderate to severe traumatic brain injury (s 7(2)(a)). It explicitly excludes injury from radiation, electricity, heat and surgery (s 7(2)(b)). Practitioners should note that this isolates mild traumatic brain injury only, leaving other brain injuries and sequelae to other SoPs noted in the instrument (s 7 Note).

Two alternative minimum factors only. The instrument requires at least one of the two alternative factors in s 9 to exist to raise a reasonable hypothesis. The first factor requires experiencing a "specified event at the time of the clinical onset of concussion" (s 9(1)). That phrase combines timing (clinical onset) with one of the specified mechanical events in the Schedule, so evidence must support both components. The second factor is "inability to obtain appropriate clinical management for concussion" (s 9(2)). That second factor is, however, temporally and causally constrained by s 10(2): it applies only to material contribution to, or aggravation of, concussion where the concussion was suffered or contracted before or during, but did not arise out of, relevant service. In practical terms that limits the second factor’s application to cases of pre‑existing concussion that were materially contributed to or aggravated by relevant service, rather than ordinary onset during service.

Specified event breadth and nuance. The Schedule’s definition of "specified event" includes acceleration or deceleration without direct external trauma to the head (Schedule, specified event(c)). That can capture indirect mechanisms such as inertial forces. It also includes explosion or explosive blast (Schedule, specified event(d)), which is relevant to many operational or peacekeeping contexts. Practitioners should note that either a direct blow or an indirect inertial mechanism is captured, but the instrument insists the specified event occur at the time of clinical onset (s 9(1)), which creates a linkage requirement between event and onset that may be difficult to prove where onset is delayed or indeterminate.

Interaction with other SoPs. Section 11 provides that if a factor in s 9 refers to an injury or disease covered by another SoP, the factors in that other SoP apply according to its terms. Practitioners must therefore check other SoPs where the factual presentation overlaps with other brain conditions. Failure to do so can lead to misapplication of causal factors or overlooking additional requirements in the cross‑referenced SoP.

Death from concussion phrasing. Section 7(3) extends the instrument to "death from a terminal event or condition that was contributed to by the person's concussion." The Schedule defines terminal event quite broadly, with examples such as pneumonia and cardiac arrest (Schedule, terminal event). This can raise issues of proximate causation and medical expert evidence showing contribution. The instrument does not provide a test beyond contribution to a terminal event, so claimants must show that the concussion contributed to the terminal event in accordance with the standards applied within the VEA/MRCA framework.

No procedural or evidentiary detail. The SoP is silent on how to prove the factors, what weight to give different types of evidence, or how to resolve competing medical opinions. The Authority asserts the medical‑scientific basis for the SoP (s 8), but it leaves the evidential application to claim processes under the VEA and MRCA. Practitioners should therefore expect contested cases to turn on medical records, timing of onset, and expert evidence that demonstrates how the specified event or lack of clinical management relates to the concussion in question.

Repeal and transition. The instrument repeals the 2012 SoP (s 4). Practitioners handling claims spanning the repeal date must consider which SoP governs the claim, particularly if a claim was lodged before the new SoP commenced. The instrument itself says nothing about transitional application; consequential administrative practice or statutory rules will control.

Terminology and definitions. The instrument uses terms that require careful reading of the Schedule, notably "relevant service" and "specified event". The Schedule’s list of service categories includes British nuclear test defence service as a distinct category (Schedule, relevant service(d)). This specificity may have implications for cases involving historical service types.

In short, the primary "gotchas" are the narrow medical definition of concussion, the tight minimum factors and their temporal/causal constraints, the necessity to consult linked SoPs when a factor refers to other injuries, and the absence of procedural detail about evidence and weighting. All of these are drawn directly from the instrument’s text (ss 7-11; Schedule).

Compliance in practice means aligning the factual and medical evidence marshalled in a claim with the instrument’s required factors and their relational constraints. The SoP prescribes two alternative minimum factual pathways to raise a reasonable hypothesis: either demonstrate a specified event at the time of clinical onset, or establish an inability to obtain appropriate clinical management that materially contributed to, or aggravated, the concussion in the circumstances described in s 10(2) (s 9; s 10(2)).

Evidence gathering. For the specified event pathway (s 9(1)), practitioners should assemble contemporaneous or near‑contemporaneous records demonstrating the occurrence of one of the Schedule’s specified events: head struck by an object, head striking an object, acceleration/deceleration movement without direct external trauma, or explosion/explosive blast (Schedule, specified event). Medical notes describing the mechanism of injury, incident reports, witness statements, and unit logs that document exposure to blast or events causing acceleration/deceleration will be directly relevant because the test requires the event to be at the time of clinical onset (s 9(1)). Clinical records describing the timing and nature of neurological disturbance that constitutes the "clinical onset of concussion" are also necessary given the timing linkage in s 9(1) and the instrument’s definition of concussion (s 7(2)(a)).

For the clinical management pathway (s 9(2)), the instrument requires proof of inability to obtain appropriate clinical management for concussion. Section 10(2) narrows the application of that factor to cases where the concussion was suffered or contracted before or during, but did not arise out of, the person’s relevant service, and where the inability to obtain appropriate clinical management materially contributed to, or aggravated, the condition. Therefore evidence should show: a pre‑existing concussion diagnosis or event; the timing relative to relevant service; documentation of attempts to obtain clinical management and of the inability to access appropriate care; and expert medical evidence linking the lack of management to material contribution or aggravation of the condition.

Establishing relation to relevant service. Whatever pathway is used, section 10(1) requires that the factor be related to the relevant service rendered by the person. Practically, compliance requires matching the timing and context of the specified event or the circumstances of clinical management to the person’s relevant service as defined in the Schedule (Schedule, relevant service). Evidence of service dates, location, operational records, and contemporaneous medical or incident reports that place the event or care context within the person’s relevant service period will be necessary to meet the relational test.

Cross‑referencing other SoPs. If a factor in s 9 refers to an injury or disease covered by another SoP, section 11 requires that the factors in that other SoP apply. Compliance therefore demands an audit of other potentially relevant SoPs where the clinical picture overlaps, and assembly of whatever additional evidence those SoPs require. The instrument’s note under s 7 identifies a number of other SoPs where trauma to the brain appears as a risk factor; practitioners should check those SoPs for any additional or different evidentiary or factor requirements.

Expert evidence. Because the instrument relies on medical‑scientific factors and a causal linkage to relevant service, expert medical opinion addressing mechanism of injury, timing of clinical onset, severity classification (mild v moderate/severe), and causal contribution to terminal events (in death cases) will be central. The SoP itself does not specify standards for experts or methods of proof; therefore practitioners should ensure expert reports directly address the SoP’s elements: the definition of concussion in s 7(2), whether the specified event occurred at clinical onset (s 9(1)), the existence and consequences of inability to obtain clinical management where relevant (s 9(2) and s 10(2)), and the relation to relevant service (s 10(1)).

Documentary completeness. Because the SoP mandates minimum factors, incomplete or ambiguous documentation on mechanism, timing of onset, service relation, or attempts at obtaining clinical management will risk failing to raise the reasonable hypothesis threshold. Practitioners should therefore aim for contemporaneous medical records, incident reports, service records, and explicit linkage in expert opinion.

Procedural awareness. The SoP applies to claims falling under s 120A of the VEA or s 338 of the MRCA (s 5). Practitioners must therefore ensure that claims are framed under the appropriate statutory provision and that the SoP’s factors are addressed in submissions and evidence in the decision file. The instrument repeals the 2012 SoP (s 4), so for any claim straddling the commencement date, confirm which SoP is applicable pursuant to administrative practice and the statutory framework, because the instrument itself does not set transitional rules.

In summary, to comply: gather specific evidence of the specified event at the time of clinical onset or of an inability to obtain appropriate clinical management with linked evidence of material contribution or aggravation where the second factor is invoked, document the relation to the relevant service category, cross‑check other relevant SoPs, and ensure expert reports address the SoP’s elements directly (ss 7-11; Schedule).