{"id":"F2017L01053","name":"Statement of Principles concerning popliteal entrapment syndrome (Reasonable Hypothesis) (No. 54 of 2017)","slug":"statement-of-principles-concerning-popliteal-entrapment-syndrome-reasonable-hypothesis-no-54-of-2017","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":439298,"registerId":"F2017L01053-fast-fetch-1775955379029","compilationNumber":null,"startDate":"2026-04-12","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Statement of Principles concerning popliteal entrapment syndrome (Reasonable Hypothesis) (No. 54 of 2017)","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 20.2\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\n\n\n \n\nStatement of Principles\n\nconcerning\n\nPOPLITEAL ENTRAPMENT SYNDROME (Reasonable Hypothesis)\n\n(No. 54 of 2017)\n\nThe Repatriation Medical Authority determines the following Statement of Principles under subsection 196B(2) of the Veterans' Entitlements Act 1986.\n\n \n\nDated 18 August 2017\n\n \n\n \n\n \n\n \n\n \n\n| The Common Seal of the Repatriation Medical Authority was affixed to this instrument at the direction of:
|\n| --- |\n| 
Professor Nicholas Saunders AO
Chairperson
|\n\n\n \n\n \n\n\nContents\n\n1 Name\n\n2 Commencement\n\n3 Authority\n\n4 Application\n\n5 Definitions\n\n6 Kind of injury, disease or death to which this Statement of Principles relates\n\n7 Basis for determining the factors\n\n8 Factors that must exist\n\n9 Relationship to service\n\n10 Factors referring to an injury or disease covered by another Statement of Principles\n\nSchedule 1 - Dictionary\n\n1 Definitions\n\n \n\n\n\n\n1 Name\n\nThis is the Statement of Principles concerning popliteal entrapment syndrome (Reasonable Hypothesis) (No. 54 of 2017).\n\n2 Commencement\n\n This instrument commences on 18 September 2017.\n\n3 Authority\n\nThis instrument is made under subsection 196B(2) of the Veterans' Entitlements Act 1986.\n\n4 Application\n\nThis instrument applies to a claim to which section 120A of the VEA or section 338 of the Military Rehabilitation and Compensation Act 2004 applies.\n\n5 Definitions\n\nThe terms defined in the Schedule 1 - Dictionary have the meaning given when used in this instrument.\n\n6 Kind of injury, disease or death to which this Statement of Principles relates\n\n(1) This Statement of Principles is about popliteal entrapment syndrome and death from popliteal entrapment syndrome.\n\nMeaning of popliteal entrapment syndrome\n\n(2) For the purposes of this Statement of Principles, popliteal entrapment syndrome means an acquired or congenital, partial or complete occlusion of the popliteal artery in the popliteal fossa, occurring during plantar flexion, in the presence of:\n\n(a) symptoms of intermittent lower limb claudication, exercise-induced leg pain, paraesthesia, or lower limb ischaemia, in the absence of other identifiable vascular risk factors that can account for those symptoms; and\n\n(b) appropriate clinical imaging studies that confirm partial or complete occlusion.\n\nNote 1: Popliteal entrapment syndrome may cause intimal damage, thrombosis, distal embolism, post-stenotic dilation or aneurysm of the popliteal artery. Popliteal artery entrapment may be accompanied by compression of the popliteal vein or tibial nerve. Aberrant anatomy of a musculotendinous structure in the popliteal fossa may be present.\n\nNote 2: Appropriate clinical imaging studies include Doppler ultrasonography, static or dynamic magnetic resonance imaging/magnetic resonance angiography, computed tomography angiography, conventional catheter-based angiography with provocation, and intravascular ultrasound.\n\nDeath from popliteal entrapment syndrome\n\n(3) For the purposes of this Statement of Principles, popliteal entrapment syndrome, in relation to a person, includes death from a terminal event or condition that was contributed to by the person's popliteal entrapment syndrome.\n\nNote: terminal event is defined in the Schedule 1 – Dictionary.\n\n7 Basis for determining the factors\n\nThe Repatriation Medical Authority is of the view that there is sound medical‑scientific evidence that indicates that popliteal entrapment syndrome and death from popliteal entrapment syndrome can be related to relevant service rendered by veterans, members of Peacekeeping Forces, or members of the Forces under the VEA, or members under the MRCA.\n\nNote: relevant service is defined in the Schedule 1 – Dictionary.\n\n8 Factors that must exist\n\nAt least one of the following factors must as a minimum exist before it can be said that a reasonable hypothesis has been raised connecting popliteal entrapment syndrome or death from popliteal entrapment syndrome with the circumstances of a person's relevant service:\n\n(1) running or jogging an average of at least 20 kilometres per week for the six months before the clinical onset of popliteal entrapment syndrome;\n\n(2) undertaking vigorous physical activity involving repeated active plantar flexion of the foot of the affected leg, or repetitive sudden and forceful contraction of the calf of the affected leg, at a minimum intensity of six METs, for an average of at least 20 hours per week for a continuous period of at least the six months before the clinical onset of popliteal entrapment syndrome;\n\nNote 1: Vigorous physical activity may include driving heavy vehicles, martial arts, physical training, and sports such as rugby, soccer, basketball, rowing or cycling. Patients typically have hypertrophy of the plantar flexor muscles, including the gastrocnemius, soleus and plantaris muscles.\n\nNote 2: MET is defined in the Schedule 1 - Dictionary. \n\n(3) having trauma to the affected limb, involving the popliteal fossa and displacing the popliteal artery, within the five years before the clinical onset of popliteal entrapment syndrome;\n\n(4) having a disease involving the popliteal fossa and displacing the popliteal artery, at the time of the clinical onset of popliteal entrapment syndrome;\n\nNote: disease involving the popliteal fossa is defined in the Schedule 1 - Dictionary.\n\n(5) running or jogging an average of at least ten kilometres per week for the three months before the clinical worsening of popliteal entrapment syndrome;\n\n(6) undertaking vigorous physical activity involving repeated active plantar flexion of the foot of the affected leg, or repetitive sudden and forceful contraction of the calf of the affected leg, at a minimum intensity of six METs, for an average of at least 20 hours per week for a continuous period of at least the three months before the clinical worsening of popliteal entrapment syndrome;\n\nNote 1: Vigorous physical activity may include driving heavy vehicles, martial arts, physical training, and sports such as rugby, soccer, basketball, rowing or cycling. Patients typically have hypertrophy of the plantar flexor muscles, including the gastrocnemius, soleus and plantaris muscles.\n\nNote 2: MET is defined in the Schedule 1 - Dictionary. \n\n(7) having trauma to the affected limb, involving the popliteal fossa and displacing the popliteal artery, within the five years before the clinical worsening of popliteal entrapment syndrome;\n\n(8) having a disease involving the popliteal fossa and displacing the popliteal artery, at the time of the clinical worsening of popliteal entrapment syndrome;\n\nNote: disease involving the popliteal fossa is defined in the Schedule 1 - Dictionary.\n\n(9) inability to obtain appropriate clinical management for popliteal entrapment syndrome.\n\n9 Relationship to service\n\n(1) The existence in a person of any factor referred to in section 8, must be related to the relevant service rendered by the person.\n\n(2) The factors set out in subsections 8(5) to 8(9) apply only to material contribution to, or aggravation of, popliteal entrapment syndrome where the person's popliteal entrapment syndrome was suffered or contracted before or during (but did not arise out of) the person's relevant service.\n\n10 Factors referring to an injury or disease covered by another Statement of Principles\n\nIn this Statement of Principles:\n\n(1) if a factor referred to in section 8 applies in relation to a person; and\n\n(2) that factor refers to an injury or disease in respect of which a Statement of Principles has been determined under subsection 196B(2) of the VEA;\n\nthen the factors in that Statement of Principles apply in accordance with the terms of that Statement of Principles as in force from time to time.\n\n \n\n \n\nSchedule 1 - Dictionary \n\nNote: See Section 5\n\n1 Definitions\n\nIn this instrument:\n\n disease involving the popliteal fossa means any pathological condition causing anatomical distortion of the popliteal fossa.\n\nNote: Examples of a disease involving the popliteal fossa include a primary or secondary neoplasm within the knee joint or the long bones of the leg, or a popliteal (Baker's) cyst.\n\n MET means a unit of measurement of the level of physical exertion. 1 MET = 3.5 ml of oxygen/kg of body weight per minute, 1.0 kcal/kg of body weight per hour or resting metabolic rate.\n\n MRCA means the Military Rehabilitation and Compensation Act 2004.\n\n popliteal entrapment syndrome—see subsection 6(2).\n\n relevant service means:\n\n(a) operational service under the VEA;\n\n(b) peacekeeping service under the VEA;\n\n(c) hazardous service under the VEA;\n\n(d) British nuclear test defence service under the VEA;\n\n(e) warlike service under the MRCA; or\n\n(f) non-warlike service under the MRCA.\n\nNote: MRCA and VEA are also defined in the Schedule 1 - Dictionary.\n\n terminal event means the proximate or ultimate cause of death and includes the following:\n\n(a) pneumonia;\n\n(b) respiratory failure;\n\n(c) cardiac arrest;\n\n(d) circulatory failure; or\n\n(e) cessation of brain function.\n\n VEA means the Veterans' Entitlements Act 1986.\n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This instrument maintains its original narrow scope. It addresses only popliteal entrapment syndrome and death resulting from it, consistent with the Repatriation Medical Authority's function of creating specific medical determination instruments for individual conditions. The scope has not expanded beyond establishing the causal factors connecting this specific vascular condition to military service."},"complexity_factors":["Moderate medical terminology requiring definitions (popliteal fossa, METs, plantar flexion)","Precise quantitative thresholds (20km/week, 6 METs, 20 hours/week, 6 months/3 months/5 years windows)","Dual structure covering both clinical onset and clinical worsening with different thresholds","Cross-references to other Statements of Principles for related conditions (section 10)","Conditional logic requiring connection to 'relevant service' as defined in veterans legislation","Specific anatomical and diagnostic criteria requiring imaging confirmation"],"plain_english_summary":"This instrument sets the medical rules for when popliteal entrapment syndrome — an artery behind the knee being compressed and causing pain or poor circulation — can be linked to military service. It defines the condition and prescribes the specific circumstances and evidence needed to form a “reasonable hypothesis” that service caused or worsened it.\n\nIt applies to veterans, peacekeepers, and current/former ADF members making VEA or MRCA claims. It matters because meeting these strict, time‑bound tests is the legal gateway to compensation."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"This instrument appears to implement a narrowly focused Statement of Principles for popliteal entrapment syndrome: it defines the condition for claims purposes, lists factors that raise a reasonable hypothesis, and specifies related evidence. There is no indication within the text that the SOP expands beyond that core purpose or materially changes the broader scope of the VEA/MRCA claims framework. Its effects are procedural and evidentiary rather than creating new types of statutory entitlements; accordingly the scope is consistent with the original intent to set medical criteria for claims adjudication."},"complexity_factors":["Short instrument (10 substantive sections + Schedule 1) but multiple cross-references (VEA/MRCA application in section 4; cross‑SOP reference in section 10).","6 defined terms explicitly used from Schedule 1 (disease involving the popliteal fossa, MET, MRCA, popliteal entrapment syndrome, relevant service, terminal event, VEA).","Nested definitional condition in section 6(2): two-part clinical requirement (symptoms + confirmatory imaging).","Multiple temporal and quantitative thresholds in section 8 (20 km/week for 6 months; 20 hours/week at >=6 METs for 6 months; 10 km/week for 3 months; 20 hours/week at >=6 METs for 3 months; trauma within 5 years).","Different rules for onset vs worsening and for pre-existing conditions (section 9(2)), creating conditional logic and exception windows.","Evidentiary specification for imaging with several modalities listed (section 6(2) Note 2), increasing technical evidentiary requirements.","Inclusion of non-clinical factor (inability to obtain appropriate clinical management, section 8(9)), expanding types of admissible evidence beyond medical tests."],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- It is a Statement of Principles (SOP) about popliteal entrapment syndrome (PES) and death from PES. The Repatriation Medical Authority (RMA) makes the SOP under subsection 196B(2) of the Veterans' Entitlements Act 1986 (see section 3). The SOP applies to claims governed by section 120A of the VEA or section 338 of the Military Rehabilitation and Compensation Act 2004 (see section 4).\n\n- The SOP defines what counts as popliteal entrapment syndrome for the purposes of veterans’/service compensation claims (see section 6(2)). Concretely, PES is an acquired or congenital partial or complete occlusion (blockage) of the popliteal artery that happens during plantar flexion of the foot, accompanied by:\n - certain symptoms (intermittent leg pain on exertion, paraesthesia, ischaemia) with no other vascular cause; and\n - appropriate clinical imaging that shows partial or complete occlusion (see section 6(2) and Note 2 to section 6).\n\n- The SOP lists specific factors which, if present, are sufficient to raise a “reasonable hypothesis” that PES (or death from PES) is related to a person’s relevant service. At least one of these factors must exist to meet that threshold (see section 8). The factors include, for example:\n - running or jogging at least 20 km per week for the six months before clinical onset (section 8(1));\n - vigorous physical activity involving repeated active plantar flexion (or sudden forceful calf contraction) at >= 6 METs for at least 20 hours per week for six months before onset (section 8(2));\n - trauma to the popliteal fossa causing displacement of the artery within five years before onset (section 8(3));\n - disease causing anatomical distortion of the popliteal fossa at time of onset (section 8(4));\n - related, shorter-duration thresholds for clinical worsening of pre-existing PES (sections 8(5)–8(8)); and\n - inability to obtain appropriate clinical management for PES (section 8(9)).\n\n- The SOP expressly includes death from PES where PES contributed to the terminal event (see section 6(3) and the defined term “terminal event” in Schedule 1).\n\n- The SOP requires that any listed factor relied on be related to the person’s “relevant service” (section 9(1)). Subsections 8(5)–8(9) are limited to material contribution or aggravation where PES existed before or during service but did not arise out of service (section 9(2)).\n\n- If a factor in section 8 refers to an injury or disease that is covered by another SOP, the terms of that other SOP apply (section 10).\n\n**Who it affects**\n\n- Primary: veterans, members of Peacekeeping Forces, and members of the Forces covered by the VEA or the MRCA who have (or died from) popliteal entrapment syndrome and who lodge claims covered by the cited statutory provisions (see section 4 and Schedule 1 definition of “relevant service”).\n\n- Secondary: doctors, radiologists and vascular specialists (because imaging and specialist reports are specified evidence), and the Department/agency that adjudicates VEA/MRCA claims (which must apply this SOP when deciding whether a reasonable hypothesis exists).\n\n**Why it matters (practical effect)**\n\n- The SOP sets a predictable, legally-recognised set of medical and activity-based criteria that adjudicators use to decide whether PES can be reasonably connected to service. If a claimant meets the SOP thresholds and the factor(s) are linked to relevant service, that raises a reasonable hypothesis under the VEA/MRCA claims process.\n\n- The SOP therefore influences whether claimants move past the “reasonable hypothesis” threshold and have their claims progressed and investigated further. It does not itself grant or refuse compensation, but it is a gatekeeping medical standard used in claims decisions.\n\n**Official rationale and a practical check against implementation costs and incentives**\n\n- The RMA states it has sound medical‑scientific evidence that PES and death from PES can be related to relevant service (see section 7). That is the official basis for specifying the factors.\n\n- Costs, administrative and evidentiary implications:\n - Claimants are likely to need clinical imaging that meets the SOP’s standard (section 6(2) Note 2 lists acceptable imaging modalities such as Doppler ultrasound, MRI/MRA, CT angiography, catheter angiography with provocation, intravascular ultrasound). That increases demand for diagnostic imaging and specialist interpretation.\n - The SOP uses activity thresholds that require measurement or verification (e.g. running 20 km/week for 6 months, sections 8(1) and 8(5); vigorous activity at >=6 METs for specified durations, sections 8(2) and 8(6)). Documenting those thresholds can be administratively burdensome (training logs, unit records, medical notes, or contemporaneous evidence will be persuasive). MET values are a technical measure (Schedule 1) and often estimated rather than measured directly.\n - The time-limited and conditional structure (different thresholds for onset versus worsening; trauma within five years; disease at time of onset) creates discrete evidentiary windows that adjudicators must check (sections 8(1)–8(8)).\n - Section 8(9) (inability to obtain appropriate clinical management) can shift focus to access-to-care evidence, adding a non‑clinical evidentiary stream to claims.\n\n- Who pays and who decides:\n - Financially, the Commonwealth ultimately funds any entitlements or compensation paid under the VEA or MRCA where a claim succeeds; the SOP is an instrument used by the decision-maker to reach that point (see section 4 application and section 3 authority). The instrument does not itself create funding lines but shapes the claims process.\n - Decision-making: the RMA determines the SOP; claims are decided by the relevant veteran/claims authority (DVA or MRCA decision-makers) who apply this SOP as part of the statutory tests in the VEA/MRCA.\n\n**Behavioral and market effects**\n\n- Effects on private actors and markets are modest and targeted:\n - Medical providers may see increased referrals for vascular imaging and specialist assessment where claimants seek to meet the SOP’s imaging requirement (section 6(2) Note 2).\n - Sports medicine, orthopaedic and vascular practices may be engaged more frequently to document or treat PES where service members undertake the kinds of physical activity listed (sections 8(1)–8(2)).\n - The SOP does not directly regulate private firms, competition or prices; however, demand for specific diagnostics and specialist reports may increase modestly in affected regions or populations.\n\n**Implementation risks, compliance burdens and notable trade‑offs**\n\n- Subjectivity and evidentiary friction: several factors require retrospective assessments (average km/wk, average hours/week at >=6 METs). Such evidence is often based on recall or imperfect documentation, creating adjudication uncertainty and potential disputes about the factual record (sections 8(1)–8(2), 8(5)–8(6)).\n\n- Precision vs accessibility: the SOP narrows the circumstances that raise a reasonable hypothesis (specific distance, duration and intensity thresholds). That clarity helps adjudicators but may exclude cases where service contributed but did not meet the numeric thresholds.\n\n- Cross‑reference complexity: where a factor overlaps with another SOP, adjudicators must apply that other SOP (section 10), adding administrative steps and potential cross-SOP interpretation issues.\n\n- Access to care: section 8(9) recognises inability to obtain appropriate management as a factor. That introduces evidence needs about healthcare access, which may vary by location and can complicate causation assessments.\n\n**Concrete mechanics to watch in claims practice (with sections cited)**\n\n- Diagnosis requires both the symptom profile and confirmatory imaging (section 6(2)).\n- Onset-related activity thresholds: 20 km/week running for 6 months (section 8(1)); or >=6 METs activity for 20 hours/week for 6 months (section 8(2)).\n- Worsening thresholds (lower distances and shorter timeframes) are in sections 8(5)–8(6) with the same METs definition and timeframes reduced to 3 months.\n- Trauma or disease displacing the artery are time‑limited factors (trauma within 5 years — sections 8(3) and 8(7); disease present at time of onset/worsening — sections 8(4) and 8(8)).\n- Relationship-to-service requirement: any factor must be related to the person’s relevant service (section 9(1)); and subsections 8(5)–(9) are limited to material contribution or aggravation where the condition pre‑existed (section 9(2)).\n\n**Bottom line**\n\nThis SOP defines PES for claims purposes, sets specific medical and activity-based thresholds that raise a reasonable hypothesis linking PES to relevant service, and prescribes the evidentiary types expected (particularly imaging). It centralises predictable criteria for claim adjudication but requires claimants to marshal clinical imaging and activity/access evidence to meet those criteria (see sections 6, 8 and Schedule 1 definitions)."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/statement-of-principles-concerning-popliteal-entrapment-syndrome-reasonable-hypothesis-no-54-of-2017","history":"/api/acts/statement-of-principles-concerning-popliteal-entrapment-syndrome-reasonable-hypothesis-no-54-of-2017/history","analysis":"/api/acts/statement-of-principles-concerning-popliteal-entrapment-syndrome-reasonable-hypothesis-no-54-of-2017/analysis","conflicts":"/api/acts/statement-of-principles-concerning-popliteal-entrapment-syndrome-reasonable-hypothesis-no-54-of-2017/conflicts","importantCases":"/api/acts/statement-of-principles-concerning-popliteal-entrapment-syndrome-reasonable-hypothesis-no-54-of-2017/important-cases","documents":"/api/acts/statement-of-principles-concerning-popliteal-entrapment-syndrome-reasonable-hypothesis-no-54-of-2017/documents"}}