{
  "schema": "injury-atlas-representative-root-level-coverage-v14",
  "levelSet": [
    "C1",
    "C2",
    "C3",
    "C4",
    "C5",
    "C6",
    "C7",
    "C8",
    "L1",
    "L2",
    "L3",
    "L4",
    "L5",
    "S1"
  ],
  "requestedRepresentativeLevelCoverageComplete": true,
  "representativeLevelCount": 14,
  "pathologyExamples": 13,
  "normalReferences": 1,
  "clinicalCertification": false,
  "completeDiseaseFamilyCoverage": false,
  "clinicalInterpretation": {
    "factualSourceIDs": [
      "dermatome-overlap",
      "radicular-pain-variation",
      "cervical-variation",
      "upper-lumbar-variation"
    ],
    "policy": "Describe possible patterns and variability; distinguish sensory loss, radicular pain and motor findings. No exact diagnostic dermatome borders, no root diagnosis from symptoms or disc level alone.",
    "C1": "Often lacks a cutaneous dermatome; a routine skin-territory overlay is inappropriate. Sensory-root and ganglion anatomy varies.",
    "upperLumbar": "A single disc can affect more than one descending root or conus-related structures; chosen one-root examples must be labelled representative."
  },
  "broaderMechanismCoverage": [
    {
      "mechanism": "Focal disc contact",
      "status": "ten accepted representative contact examples; nerve shape unchanged",
      "levels": [
        "C3",
        "C4",
        "C6",
        "C7",
        "C8",
        "L2",
        "L3",
        "L4",
        "L5",
        "S1"
      ],
      "completeFamily": false
    },
    {
      "mechanism": "Non-disc upper cervical joint encroachment",
      "status": "accepted C2 joint-attached osteophyte/root-DRG contact example",
      "levels": [
        "C2"
      ],
      "completeFamily": false
    },
    {
      "mechanism": "Qualitative continuous nerve narrowing/deflection",
      "status": "accepted original continuous C5 and L1 qualitative examples; no measured pressure or severity",
      "levels": [
        "C5",
        "L1"
      ],
      "pointContactSufficient": false,
      "clinicalPressureOrSeverityCalibration": false
    },
    {
      "mechanism": "Root anatomy without invented lesion",
      "status": "accepted normal-only C1 reference with disclosed sensory variant",
      "levels": [
        "C1"
      ],
      "injuredControlApplicable": false
    },
    {
      "mechanism": "Additional causes and variants",
      "status": "beyond single representative level coverage",
      "examples": [
        "multilevel disease",
        "osseous/ligamentous foraminal or recess narrowing",
        "larger central multiroot or cord/conus involvement",
        "migration/extrusion/sequestration",
        "transitional vertebral numbering",
        "conjoined roots or plexus/rootlet variation",
        "inflammatory/chemical irritation without a conspicuous contact lesion"
      ],
      "allCausesAndVariantsComplete": false
    }
  ],
  "factualSources": [
    {
      "id": "cervical-exit-naming",
      "title": "Anatomy, Head and Neck: Cervical Nerves",
      "url": "https://www.ncbi.nlm.nih.gov/books/NBK538136/",
      "alternate": "https://pubmed.ncbi.nlm.nih.gov/30844163/",
      "type": "authoritative anatomy reference",
      "access": "Indexed official source text and PubMed excerpt read; direct Bookshelf request challenged",
      "supports": "C1–C7 emerge above the same-numbered vertebra; C8 emerges below C7. Root and vertebral numbers are distinct.",
      "limits": "General reference; not a licence for its dermatome illustrations or patient anatomy."
    },
    {
      "id": "upper-cervical-no-disc",
      "title": "Craniocervical junction involvement in inflammatory arthritis: a single-center radiologic study",
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC10760572/",
      "type": "primary radiologic cohort with anatomical introduction",
      "access": "Indexed full official text read",
      "supports": "Occiput–atlas and atlas–axis are synovial-joint anatomy, without intervening discs; atlas ring/lateral masses and axis dens require distinct geometry.",
      "limits": "Cohort disease frequencies and inflammatory changes are not a template for the proposed C2 osteoarthritis example."
    },
    {
      "id": "c1-primary-variation",
      "title": "Classification and clinical anatomy of the first spinal nerve: surgical implications",
      "url": "https://pubmed.ncbi.nlm.nih.gov/19441999/",
      "doi": "10.3171/2008.12.SPINE08661",
      "type": "primary adult cadaveric study",
      "access": "Indexed official abstract read",
      "supports": "C1 dorsal roots and ganglia vary; a ventral-only C1 nerve is a documented anatomical variant.",
      "limits": "Do not infer universal absence of C1 sensory roots, ganglia or all sensory function; no specimen geometry reused."
    },
    {
      "id": "c1-primary-dorsal",
      "title": "Clinical anatomy of the C1 dorsal root, ganglion, and ramus: a review and anatomical study",
      "url": "https://pubmed.ncbi.nlm.nih.gov/17330847/",
      "doi": "10.1002/ca.20472",
      "type": "primary adult cadaveric study",
      "access": "Indexed official abstract read",
      "supports": "C1 dorsal-root/ganglion presence and spinal-accessory connections vary across specimens.",
      "limits": "A different cadaver cohort from the 2009 study; percentages are not universal population prevalence."
    },
    {
      "id": "c1-suboccipital-anatomy",
      "title": "Neuroanatomy, Suboccipital Nerve",
      "url": "https://www.ncbi.nlm.nih.gov/books/NBK556133/",
      "type": "authoritative anatomy reference",
      "access": "Indexed official full text read; direct request challenged",
      "supports": "Suboccipital nerve is the C1 dorsal ramus, predominantly motor to suboccipital muscles; its course is above the atlas posterior arch beside vertebral artery context. It does not supply a routine cutaneous dermatome.",
      "limits": "Root/spinal nerve/dorsal ramus must not be treated as interchangeable; source variants are simplified for an authored reference."
    },
    {
      "id": "c2-cadaver-corridor",
      "title": "Anatomic considerations of C2 nerve root ganglion",
      "url": "https://pubmed.ncbi.nlm.nih.gov/9549785/",
      "doi": "10.1097/00007632-199803150-00001",
      "type": "primary cadaveric study",
      "access": "Indexed official abstract read",
      "supports": "C2 roots and dorsal-root ganglia occupy the corridor between atlas arch and axis lamina.",
      "limits": "Study measurements are not patient dimensions or automatic constriction targets."
    },
    {
      "id": "c2-joint-lesion",
      "title": "Occipital neuralgia secondary to unilateral atlantoaxial osteoarthritis: Case report and review of the literature",
      "url": "https://pubmed.ncbi.nlm.nih.gov/26759731/",
      "doi": "10.4103/2152-7806.172531",
      "type": "primary clinical case report",
      "access": "Official PubMed abstract and textual figure descriptions read",
      "supports": "A posterior C1–C2 lateral-joint osteophyte can encroach upon the C2 root. This supports a non-disc educational mechanism.",
      "limits": "Single rare clinical case; does not prove that all upper-neck/scalp pain arises from C2 root compression. Images/CT/MRI coordinates not copied."
    },
    {
      "id": "cervical-variation",
      "title": "Reliability and Diagnostic Accuracy of Standard Dermatomes and Myotomes for Determining the Pathologic Level in Surgically Verified Patients With Cervical Radiculopathy",
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9816603/",
      "doi": "10.14245/ns.2244194.097",
      "type": "primary retrospective surgically verified cohort",
      "access": "Official full text read",
      "supports": "Table 1 maps C4–C5/C5, C5–C6/C6, C6–C7/C7 and C7–T1/C8. Symptoms often depart from conventional dermatomal/myotomal patterns.",
      "limits": "Selected surgical C5–C8 population; not evidence for upper-cervical prevalence or exact universal borders."
    },
    {
      "id": "lumbar-exit-traverse",
      "title": "Lumbar Disc Herniation",
      "url": "https://www.ncbi.nlm.nih.gov/books/NBK560878/",
      "type": "authoritative clinical/anatomy reference",
      "access": "Indexed official clinical/anatomical text read; direct request challenged",
      "supports": "Lumbar exiting roots lie in the same-numbered caudal foramen; paracentral lesions usually involve the next descending root, whereas foraminal/far-lateral lesions involve the exiting root.",
      "limits": "A positional rule for standard numbered anatomy, not a diagnosis from disc level alone; transitional/conjoined variants require separate handling."
    },
    {
      "id": "lumbar-spatial-zones",
      "title": "Magnetic resonance imaging of the spine",
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC7571515/",
      "type": "peer-reviewed anatomical imaging reference",
      "access": "Indexed official spatial-reporting section read; direct request challenged",
      "supports": "Pedicle and facet margins define central/subarticular/foraminal/extraforaminal locations; L3–L4 recess contains traversing L4 while its foramen contains exiting L3.",
      "limits": "Spatial definitions guide original review; imaging panels and measured disease dimensions are not assets."
    },
    {
      "id": "upper-lumbar-variation",
      "title": "Clinical Features and Treatments of Upper Lumbar Disc Herniations",
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC2941853/",
      "doi": "10.3340/jkns.2010.48.2.119",
      "type": "primary retrospective surgical cohort",
      "access": "Indexed official full text read; direct request challenged",
      "supports": "L1–L2/L2–L3 clinical presentation can be poorly localized and involve multiple roots or conus-related anatomy.",
      "limits": "Selected 41-patient surgical cohort; not a deterministic single-root symptom map."
    },
    {
      "id": "l1-original-case",
      "title": "L1 Radiculopathy Caused by L1–L2 Extraforaminal Disc Herniation",
      "url": "https://www.jstage.jst.go.jp/article/ssrr/7/1/7_2022-0107/_pdf/-char/en",
      "doi": "10.22603/ssrr.2022-0107",
      "type": "primary clinical case report",
      "access": "Publisher PDF text read",
      "supports": "An L1–L2 lateral/extraforaminal lesion can affect L1; reported symptoms crossed simple inguinal-only expectations.",
      "limits": "The actual case is extraforaminal. Classify an authored candidate by actual pedicle boundaries; do not call a lateral lesion foraminal merely from the root number. No figures/CT data reused."
    },
    {
      "id": "conus-position-variation",
      "title": "Conus medullaris termination: Assessing safety of spinal anesthesia in the L2–L3 interspace",
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC11780305/",
      "type": "primary adult MRI cohort",
      "access": "Indexed official results and methods read",
      "supports": "Adult conus termination varies; L1 was common in this 944-patient cohort. A disclosed lower-L1 representative tip is plausible.",
      "limits": "Do not extend a generic lumbar cord to every disc or infer an individual conus position from population data."
    },
    {
      "id": "cord-segment-versus-vertebra",
      "title": "Anatomical relationship and positions of the lumbar and sacral segments of the spinal cord according to the vertebral bodies and the spinal roots",
      "url": "https://pubmed.ncbi.nlm.nih.gov/23649511/",
      "doi": "10.1002/ca.22253",
      "type": "primary adult cadaveric study",
      "access": "Indexed official abstract read",
      "supports": "Spinal cord segment/root origins do not equal same-numbered vertebral body levels; lumbar/sacral root courses descend from more cranial origins.",
      "limits": "Do not attach L2/L3 rootlets to a convenient same-numbered low lumbar cord segment. Cropped proximal origins may be omitted with disclosure."
    },
    {
      "id": "dermatome-overlap",
      "title": "An evidence-based approach to human dermatomes",
      "url": "https://pubmed.ncbi.nlm.nih.gov/18470936/",
      "doi": "10.1002/ca.20636",
      "type": "systematic anatomical evidence review",
      "access": "Official indexed abstract read",
      "supports": "Published dermatome maps differ, and overlap and individual variability need emphasis.",
      "limits": "Map is not reproduced, traced, recolored or converted into geometry."
    },
    {
      "id": "radicular-pain-variation",
      "title": "Pain patterns and descriptions in patients with radicular pain: Does the pain necessarily follow a specific dermatome?",
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC2753622/",
      "doi": "10.1186/1746-1340-17-9",
      "type": "primary retrospective clinical study",
      "access": "Indexed official full text read",
      "supports": "Cervical and lumbar radicular pain often fails to follow a conventional dermatome; even the more commonly dermatomal S1 presentation is not universal.",
      "limits": "Pain distributions are not equivalent to tactile sensory territories and are not definitive diagnostic root assignments."
    },
    {
      "id": "contact-deviation-compression",
      "title": "MR image-based grading of lumbar nerve root compromise due to disk herniation: reliability study with surgical correlation",
      "url": "https://pubmed.ncbi.nlm.nih.gov/14699183/",
      "doi": "10.1148/radiol.2302021289",
      "type": "primary MRI reliability/surgical-correlation study",
      "access": "Official PubMed abstract read",
      "supports": "Contact, displacement/deviation and compression are distinct observations.",
      "limits": "A clinical MRI classification is not applied as a numeric grade to a generic illustration. Qualitative authored shape changes require independent plausibility checks."
    }
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