Statement of Principles concerning traumatic brachial plexopathy (Reasonable Hypothesis) (No. 1 of 2025)

The central concept is the "reasonable hypothesis" standard. This SoP is made under subsection 196B(2) of the VEA, meaning it applies when a claim requires a reasonable hypothesis connecting the condition to service (as opposed to a claim where the decision-maker must be reasonably satisfied). The instrument itself does not define "reasonable hypothesis" beyond requiring that at least one of the factors in section 8 "must as a minimum exist before it can be said that a reasonable hypothesis has been raised". This is a threshold: if no factor exists, the hypothesis is not raised; if a factor exists, the decision-maker still must consider whether the hypothesis is reasonable on the whole of the evidence, but the factor is a necessary condition, not a sufficient one.

Traumatic brachial plexopathy is defined narrowly. It means a physical injury to the brachial plexus, but the instrument explicitly excludes five other conditions that might present similarly: Parsonage-Turner syndrome (neuralgic amyotrophy), radiation-induced plexus injury, thoracic outlet syndrome, cervical radiculopathy or myelopathy, and upper limb mononeuritis multiplex. This is critical because a claimant with brachial plexus symptoms from one of these excluded conditions cannot bring a claim under this SoP, even if those conditions may also be service-related. The note accompanying the definition states there is a separate SoP for thoracic outlet syndrome, confirming that the RMA treats these as distinct conditions with separate causal pathways.

Death from traumatic brachial plexopathy is also included, but only where a terminal event (defined in the dictionary as pneumonia, respiratory failure, cardiac arrest, circulatory failure, or cessation of brain function) was contributed to by the condition. This means the condition need not be the sole cause of death, but must have contributed to the proximate cause. The dictionary defines "terminal event" exhaustively as one of those five listed outcomes, not as any cause of death. A claimant whose death involved something not on that list (e.g., suicide or a separate injury) would not be covered unless the condition contributed to a listed terminal event.

The factors themselves are each tied to a specific timeframe before "clinical onset or clinical worsening". "Clinical onset" is not defined in the instrument, but generally means when the condition becomes diagnosable by a medical practitioner. "Clinical worsening" is separately addressed in section 9(2): it applies only to material contribution to or aggravation of traumatic brachial plexopathy where the condition was suffered or contracted before or during (but did not arise out of) the person's relevant service. So for worsening, the condition must pre-exist service but not have been caused by service; the factor must materially contribute to worsening. This is a narrower application than for clinical onset, where the condition first manifests.

The instrument also incorporates by reference other SoPs. Section 10 says if a factor refers to an injury or disease covered by another SoP, then the factors from that other SoP apply as in force from time to time. This cross-referencing means that, for example, factor 8(a) (trauma to the upper chest, shoulder or neck) might itself be a condition for which a separate SoP exists; the decision-maker would then need to satisfy the factors of that other SoP in addition, effectively creating a chain of causation proofs.

The instrument directly affects three categories of persons and indirectly affects several others. Directly, it affects veterans who have rendered operational service, peacekeeping service, hazardous service, or British nuclear test defence service under the VEA; and members who have rendered warlike or non-warlike service under the MRCA. These are the "relevant service" definitions in the dictionary. For those persons, this SoP determines whether a claim for traumatic brachial plexopathy can succeed at the reasonable hypothesis stage. It applies to both original claims and claims for worsening. The instrument binds decision-makers in the Department of Veterans' Affairs, the Repatriation Commission, and the Military Rehabilitation and Compensation Commission when assessing claims for this condition under section 120A of the VEA or section 338 of the MRCA.

Indirectly, the instrument affects medical practitioners who provide opinions in support of claims. They must understand the specific factors and timeframes to opine on whether the factor existed. For example, a doctor might need to assess whether a patient had "malposition of the head, neck, or shoulders" during surgery under general anaesthesia within 24 hours before clinical onset. This requires precise documentation of surgical positioning, anaesthetic records, and the timing of symptom onset. Similarly, the factor about carrying loads of at least 20 kg (or 10 kg on one shoulder) for at least two hours within 24 hours before clinical onset imposes a factual inquiry about the claimant's activities on that specific day. The examples given (loaded backpack, body armour, rifle, ammunition, communication systems, sandbags) suggest a strong military context, but note the weight must be combined if multiple items are carried; the factor requires the bulk of the load to be supported by the shoulders (for factor 8(e)) or by one shoulder (for factor 8(f)). This will affect soldiers, police, or other personnel carrying heavy equipment, but also any person who carried such loads in the relevant timeframe.

The instrument also affects legal practitioners and advocates who must advise claimants on which factors might apply and gather evidence to support them. The strict timeframes (e.g., one year for trauma, 24 hours for malposition, seven days for sternotomy, 24 hours for electrical injury) mean that claims may fail simply because the claimant cannot prove the exact timing, even if a reasonable hypothesis exists on other grounds. The inability to obtain appropriate clinical management factor (8(g)) is open-ended and does not have a timeframe, but applies only to clinical worsening, not onset. This may provide a pathway for claims where the condition deteriorated due to delayed or inadequate treatment, but the "inability" must be related to service circumstances.

Claimants whose condition falls within the exclusions (e.g., Parsonage-Turner syndrome) are not covered by this SoP. They may have other SoPs applicable (the note references thoracic outlet syndrome separately), but they must find the correct instrument and satisfy its factors. This increases transaction costs for claimants with brachial plexus symptoms that are not strictly "physical injury" as defined.

The instrument does not impose duties on private persons. It is a legislative instrument that binds decision-makers in assessing claims under the VEA and MRCA. The key right it confers is the right of a claimant to have their claim assessed according to this SoP if they raise a reasonable hypothesis. Conversely, the instrument limits that right by requiring at least one factor from section 8 to exist. If no factor is found, the decision-maker must reject the claim at the reasonable hypothesis stage, regardless of other evidence.

The rights are procedural and evidentiary. Claimants have the right to present evidence that one of the factors exists and is related to service. The decision-maker has the duty to consider all factors and to apply the temporal windows strictly. For example, if a veteran suffered trauma to the upper chest, shoulder or neck more than one year before clinical onset, factor 8(a) cannot be satisfied, even if medical evidence suggests a causal link. The decision-maker also has the duty to consider whether the factor refers to an injury or disease covered by another SoP (section 10). If so, the decision-maker must apply the factors from that other SoP. This creates a cascading set of requirements that can multiply the evidentiary burden.

The clinical worsening provision (section 9(2)) creates a specific limitation: it applies only where the condition was suffered or contracted before or during relevant service but did not arise out of that service. This means that if the condition arose out of service (e.g., was caused by a trauma that occurred during service), the worsening provision does not apply; instead the claim would be for the original onset. This distinction matters for timing of factors and for the "inability to obtain clinical management" factor, which only operates for worsening.

Claimants have the right to rely on the examples given in the notes, but the notes are not exhaustive. The note to factor 8(a) lists examples of surgery that may cause trauma (clavicle fracture surgery, brachial plexus nerve block, catheterisation of subclavian or internal jugular veins, axillary arteriography). However, the factor itself requires trauma to the upper chest, shoulder or neck; any such trauma, even if not explicitly listed, could suffice if it meets the definition in the dictionary ("traction, compression, penetrating injury or surgery"). The dictionary definition is the controlling one; the examples are illustrative.

The instrument does not create a duty for the government to provide medical treatment or to prevent the condition. It is solely a compensatory framework. There is no right to review or appeal within the instrument itself; that is governed by the parent Acts.

This instrument creates no penalties, either civil or criminal. It is not a regulatory instrument that prohibits conduct; it is a determination that sets conditions for entitlement to compensation. Enforcement, in the sense of ensuring compliance, is done by decision-makers who must apply the SoP to claims. If a decision-maker fails to apply the SoP correctly, that could be grounds for review under the VEA or MRCA administrative review provisions, but the instrument itself provides no enforcement mechanism.

There is a potential for fraud if a claimant fabricates evidence to meet a factor (e.g., falsely claiming to have carried a load of 20 kg within 24 hours before onset). That would be dealt with under the general criminal law (e.g., perjury or making false statements) or under provisions of the VEA or MRCA that penalise false or misleading claims. But the SoP does not address this.

From a compliance burden perspective, the rigour of the factors may incentivise decision-makers to request extensive documentary evidence, such as medical records showing surgical positioning, anaesthetic charts, load-carrying logs, or contemporaneous reports of trauma. For claimants, the burden is to produce this evidence. The lack of any penalty for the government if it delays or denies claims improperly is not addressed in the instrument; the remedy lies in appeal rights under the parent Acts.

The concept of "inability to obtain appropriate clinical management" (factor 8(g)) is a soft factor that could be subject to interpretive dispute. The instrument does not define "appropriate clinical management" or "inability". This could lead to inconsistent decision-making, with some decision-makers accepting that a veteran's location or military duties prevented access to care, while others require concrete evidence of attempts to obtain care. This uncertainty imposes a compliance burden on claimants to document any barriers to treatment.

The instrument is made under the VEA and explicitly interacts with the MRCA. Section 4 states it applies to claims under section 120A of the VEA and section 338 of the MRCA. These are the provisions that set the reasonable hypothesis standard for operational service (VEA) and warlike/non-warlike service (MRCA). If the standard of proof were "reasonable satisfaction" (e.g., for peacetime service under VEA), a different SoP made under subsection 196B(3) would apply; this instrument is specifically for the reasonable hypothesis standard.

The dictionary defines "relevant service" to include operational service, peacekeeping service, hazardous service, British nuclear test defence service (all under VEA), and warlike or non-warlike service (under MRCA). This means the instrument does not apply to claims under the Safety, Rehabilitation and Compensation Act 1988 (SRCA) or the Defence Force Retirement and Death Benefits Act 1973, unless those Acts incorporate the VEA standard by reference. In practice, the SoP regime is limited to the veteran and military compensation schemes.

Section 10 creates a direct interaction with other SoPs. If a factor in this SoP itself refers to an injury or disease for which another SoP exists (e.g., "trauma" might be a condition with its own SoP), then the factors from that other SoP must be satisfied. This means a claimant may need to satisfy multiple SoPs in a chain. For example, factor 8(a) requires "having trauma to the upper chest, shoulder or neck". If "trauma" is defined in a separate SoP as requiring its own factors (e.g., a specific level of force or mechanism), then the claimant must prove not only that the trauma occurred but also that the trauma itself meets the factors of the relevant SoP for that injury. This cascading requirement is not elaborated in the instrument, but it is legally significant.

The note to section 6(2)(c) (exclusion of thoracic outlet syndrome) states there is a separate set of SoPs for that condition that may also be applicable. This confirms that the RMA has issued separate SoPs for different peripheral nerve or shoulder conditions. Practitioners must be careful to identify the correct SoP for the diagnosed condition. A misdiagnosis of traumatic brachial plexopathy when the actual condition is thoracic outlet syndrome would lead to the wrong SoP being applied.

The instrument also interacts with the general law of evidence and administrative review. The existence of a factor does not automatically create a reasonable hypothesis; the hypothesis must still be reasonable on the whole of the evidence. The Administrative Appeals Tribunal and the Veterans' Review Board are likely to defer to the RMA's determination as a binding instrument, but they retain the ability to find that even if a factor exists, the hypothesis is not reasonable (e.g., because supervening causes break the chain). The instrument does not displace the common law of causation beyond what the VEA provides.

The instrument is dated 17 December 2024 and commences on 28 January 2025. It is titled "No. 1 of 2025". This suggests it is a new instrument, not an amendment of an existing one. There is no reference to any earlier SoP on traumatic brachial plexopathy, no revocation clause, and no amendment history within the text. It appears to be the first SoP for this condition under the Reasonable Hypothesis standard, though there may have been an earlier "Reasonable Satisfaction" version. The instrument does not state whether it replaces a prior SoP. Without such a statement, the legal effect is that for claims made after 28 January 2025, this SoP applies. For claims made before that date, the previous SoP (if any) would apply.

Because the instrument is made under subsection 196B(2) of the VEA, it is a legislative instrument (likely a disallowable instrument) subject to tabling and possible disallowance by Parliament. The amendment history would be found in the Federal Register of Legislation, but the instrument text does not provide it. As a deep dive, we note the commencement date and the fact that it is numbered 1 of 2025, implying it is the first SoP issued in 2025.

The instrument's content does not indicate any transitional provisions. It applies to all claims to which section 120A VEA or section 338 MRCA apply, without temporal limitation. There is no grandfathering for existing claims or pending applications. This could cause confusion for claims that were lodged before commencement but not yet determined; the decision-maker would need to apply the SoP in force at the time of decision, unless transitional provisions in the VEA require application of the SoP in force at the time of claim. The instrument itself is silent on this point.

The instrument text does not mention any litigation, and no cases are cited. Because this is a new instrument that commences on 28 January 2025, there is no litigation history directly on this SoP. However, there is a broader litigation history regarding the SoP regime under the VEA. The High Court has considered the validity and interpretation of SoPs in cases such as Repatriation Commission v Smith (1997) and Lees v Repatriation Commission (2002), but those are not referenced in the instrument and are not part of the source. The instrument itself is a determination of fact by the RMA, not a judicial decision.

The factors listed may be subject to future challenge on the basis that the RMA has no sound medical-scientific evidence for a particular factor, but the instrument does not disclose the evidence. Section 196B(2) requires the RMA to be satisfied that there is sound medical-scientific evidence; that satisfaction is judicially reviewable for legal error but not for factual correctness. Claimants could argue that a factor is arbitrary or not supported by evidence, but the courts give significant deference to the RMA's specialist expertise. The exclusion of conditions like Parsonage-Turner syndrome might be challenged if a claimant argues it is a form of traumatic brachial plexopathy, but the instrument explicitly excludes it, so that argument would require an error of law.

Given the instrument's recent commencement, there is no case law interpreting its specific factors. The "carrying a load" factors (8(e) and 8(f)) will likely generate argument about what constitutes "bulk of the load is supported by the shoulders" and how to measure weight when multiple items are carried. The examples list equipment common to military service, but the factor is not limited to military contexts. The 20 kg and 10 kg thresholds may be arbitrary; some claimants might argue that a lower weight over a longer period should suffice, but the instrument is strict.

The "malposition" factor (8(b)) includes "reduced conscious state" with examples of sleep associated with alcohol or drug induced intoxication ("Friday or Saturday night palsy") or head injury. This factor may raise issues of personal responsibility, but the instrument does not consider contributory negligence or conduct. The RMA's inclusion of this factor suggests that even voluntary intoxication that leads to malposition can be a factor, if related to service. This could lead to litigation over whether a reduced conscious state after drinking on leave is "related to service" within the meaning of section 9.

Several traps await the unwary. The most significant is the strict timeframe for each factor. Factor 8(a) requires trauma within one year before clinical onset or clinical worsening, but note 5 warns that delayed onset may occur due to callus formation around fractures or scar tissue development. This means that even if the trauma occurred more than a year before, the clinical onset might be delayed, but the factor still requires the trauma to be within one year before onset. If the latent period is longer than a year, factor 8(a) cannot be used, even if medical evidence shows causation. Claimants with delayed symptoms must find another factor.

Factor 8(b) requires malposition within 24 hours before clinical onset or worsening. This includes surgery, prone positioning in ICU, or reduced conscious state. The examples of surgery include the Trendelenburg position, which is common in laparoscopic surgery. But note that the malposition must be of the head, neck, or shoulders, and the factor applies only if one of the listed circumstances (surgery under general anaesthesia, prone positioning in ICU, reduced conscious state) is present. A person who falls asleep in a chair with head tilted unnaturally but is not intoxicated or injured does not have "reduced conscious state" as defined; the examples given are alcohol/drug intoxication or head injury. Normal sleep may not suffice.

Factor 8(c) requires a median sternotomy within 7 days before clinical onset or worsening. This is a specific surgical procedure. Other chest surgeries that do not involve a sternotomy (e.g., thoracotomy) will not qualify, even if they cause trauma to the brachial plexus. The examples list coronary artery bypass, cardiac valve surgery, etc., but the factor is limited to median sternotomy.

Factors 8(e) and 8(f) on load carrying have weight thresholds and time requirements: at least 20 kg for two hours, or at least 10 kg for two hours for a one-shoulder load. The weight is the combined weight of all items where the bulk is supported by the shoulders (or one shoulder). A backpack plus body armour plus rifle may together exceed 20 kg, but the note says "where more than one type of load is combined the combined weight must exceed [20kg/10kg]". So it is not enough to carry 10 kg in a backpack and separately hold a 10 kg rifle if the rifle is supported by the shoulders? The factor requires the "bulk of the load" to be supported by the shoulders. If the load is not shoulder-supported (e.g., carried in hands), the factor does not apply. Also, the two hours must be within the 24 hours before clinical onset. Casual load carrying over a longer period will not suffice.

Factor 8(g) (inability to obtain appropriate clinical management) only applies to clinical worsening, not to clinical onset. This is a subtle but important limitation. A claimant whose condition is stable but untreated might argue that the inability to get care caused the condition to persist or worsen, but if the condition first manifested after service and the lack of care was due to service circumstances, that might be covered. The words "before clinical worsening" imply that the inability must occur at a time when appropriate management could have prevented worsening. The instrument does not define "appropriate clinical management" or "inability". This is a wide and uncertain gateway that could be exploited or contested.

The dictionary definition of "trauma to the upper chest, shoulder or neck" includes traction, compression, penetrating injury or surgery. Note that it does not include blunt force without traction/compression? Actually blows are listed as examples of "traction and/or compression". So any blow that causes traction or compression qualifies. But the factor requires the trauma to be "to the affected upper chest, shoulder or neck region". "Affected" means the side where the brachial plexopathy occurred. If the trauma is to the opposite side, the factor is not met.

Section 9(2) states that the clinical worsening aspects apply only to material contribution to or aggravation where the condition was suffered or contracted before or during (but did not arise out of) relevant service. This means if the condition arose out of service (i.e., was caused by service), the worsening factor cannot be used for a subsequent worsening; instead the claim would be for the original condition (which must be related to service). This could create a strange result where a veteran who develops traumatic brachial plexopathy from a service-related injury then suffers a worsening due to inability to obtain subsequent clinical management; that later worsening might not be compensated under this SoP because the condition already arose out of service. The factor 8(g) would then be inapplicable, and the claim would have to rely on the original causal factor.

"Compliance" in this context means ensuring a claim for traumatic brachial plexopathy under the reasonable hypothesis standard is properly documented and meets the requirements of the SoP. For the claimant and their advisors, the steps are as follows.

First, confirm the correct diagnosis. The condition must be traumatic brachial plexopathy as defined in section 6(2): a physical injury to the brachial plexus, excluding the five listed conditions. If the diagnosis is uncertain or potentially within the exclusions (e.g., thoracic outlet syndrome), seek specialist confirmation. The SoP is not applicable if the condition is excluded, and a claim under the wrong SoP will be rejected.

Second, identify which factor or factors from section 8 could apply. This requires a detailed history of activities, injuries, surgeries, and medical treatment during the relevant service period. For each potential factor, gather evidence of:

• The timing of clinical onset or worsening. Obtain medical records documenting when symptoms first appeared or when they materially worsened. The instrument does not define "clinical onset", but it generally means when symptoms become sufficiently significant to warrant medical attention or diagnosis. A contemporaneous medical report is valuable.
• For factor 8(a): evidence of trauma to the upper chest, shoulder or neck on the affected side within one year before onset. This could include accident reports, medical notes of fractures or lacerations, surgical records (e.g., for clavicle fracture or brachial plexus nerve block). Note the delayed onset caveat: if onset is delayed beyond a year, factor 8(a) will not work even if trauma was causative.
• For factor 8(b): evidence of malposition of head, neck, or shoulders during surgery under general anaesthesia, prone positioning in ICU, or reduced conscious state (e.g., alcohol/drug intoxication or head injury). Obtain anaesthetic records, ICU charts, or witness statements. The malposition must occur within 24 hours before onset.
• For factor 8(c): evidence of median sternotomy within 7 days before onset. This requires records of the specific surgical procedure. Thoracotomy alone does not suffice.
• For factor 8(d): evidence of electrical injury to the brachial plexus within 24 hours before onset. Document the nature of the electrical injury and its connection to the brachial plexus.
• For factors 8(e) and (f): evidence of carrying a load meeting the weight and time thresholds within 24 hours before onset. This may require logs, orders to carry equipment, photos, or contemporaneous statements. The weight must be at least 20 kg (shoulder supported) or at least 10 kg (one shoulder supported). Calculation of combined weight is essential. The "bulk of the load" must be supported by the shoulders; items carried by hand or strapped elsewhere may not count. The two hours need not be continuous; the total time carrying such loads within the 24-hour period must be at least two hours.
• For factor 8(g): if claiming clinical worsening, evidence of inability to obtain appropriate clinical management before the worsening. This could include medical records showing that treatment was recommended but unavailable due to service circumstances (e.g., being in a remote location, lack of specialist, denial of treatment by military authorities). The term "inability" suggests objective barriers, not mere preference.

Third, ensure that the selected factor is related to the person's relevant service as defined (operational, peacekeeping, hazardous, British nuclear test, warlike, or non-warlike service). The causal connection must be between the factor and the service, not just between the condition and service. For example, if a veteran carried a heavy backpack during military training that was part of service, factor 8(e) is related to service. If they carried a similar load in a civilian job before service, it is not related.

Fourth, consider whether any factor refers to an injury or disease covered by another SoP (section 10). For example, "trauma" might be defined in a separate SoP requiring its own factors. If so, the claimant must also satisfy that separate SoP. This is a cascading requirement. Obtain legal advice on whether other instruments apply.

Fifth, document everything contemporaneously where possible. The strict timeframes mean that after the fact reconstructions may be challenged. Obtain medical records as early as possible. Statement of principles are applied by decision-makers who are instructed to verify each element. A claim that lacks evidence for a factor will fail even if the underlying hypothesis is medically plausible.

For decision-makers and advocates, compliance means checking each factor strictly. Do not assume a factor exists because the condition is service-related. The instrument is designed to filter claims; if no factor is present, the claim must be rejected at the reasonable hypothesis stage, regardless of other evidence. Conversely, if a factor is present and related to service, a reasonable hypothesis may be raised, but the decision-maker must still determine whether the hypothesis is reasonable on the balance of the evidence (including evidence of alternative causes).