{
  "generated_at": "2026-05-08T19:32:32.525Z",
  "tribunal": "ONWSIB",
  "source_dataset_total": 463,
  "filter": "keywords_api contains pre-existing condition",
  "overview": {
    "pre_existing_cases": 31,
    "share_of_archive_percent": 6.7,
    "public_classified_cases": 1,
    "public_unknown_cases": 30,
    "deep_dive_high_confidence_cases": 0,
    "manual_review_queue_hits": 0
  },
  "by_year": [
    {
      "year": 2020,
      "count": 0
    },
    {
      "year": 2021,
      "count": 2
    },
    {
      "year": 2022,
      "count": 21
    },
    {
      "year": 2023,
      "count": 5
    },
    {
      "year": 2024,
      "count": 0
    },
    {
      "year": 2025,
      "count": 3
    },
    {
      "year": 2026,
      "count": 0
    }
  ],
  "body_part_cooccurrence": [
    {
      "bodyPart": "shoulder",
      "count": 6
    },
    {
      "bodyPart": "knee",
      "count": 5
    },
    {
      "bodyPart": "neck",
      "count": 2
    },
    {
      "bodyPart": "ankle",
      "count": 1
    },
    {
      "bodyPart": "wrist",
      "count": 1
    },
    {
      "bodyPart": "hip",
      "count": 1
    }
  ],
  "issue_flag_cooccurrence": [
    {
      "issue": "Work-related injury",
      "count": 4
    },
    {
      "issue": "Employer mention",
      "count": 3
    },
    {
      "issue": "Benefits or LOE",
      "count": 2
    },
    {
      "issue": "Return to work or modified duties",
      "count": 2
    },
    {
      "issue": "Permanent impairment or NEL",
      "count": 1
    },
    {
      "issue": "Mental health language",
      "count": 1
    }
  ],
  "notes": [
    "This slice tracks ONWSIB records whose published keyword text includes pre-existing condition language.",
    "Most of these records remain unresolved in the public archive, so this sub-analysis is strongest as a pattern map rather than an outcome study.",
    "Deep-dive predictions for these cases remained below the 0.55 threshold used for high-confidence ONWSIB sidecar promotion."
  ],
  "cases": [
    {
      "case_id": "2021canlii133787",
      "year": 2021,
      "citation": "2021 CanLII 133787 (ON WSIB)",
      "decision_date": "2021-06-24",
      "docket_number": "20210023",
      "url": "https://canlii.ca/t/jlh82",
      "keywords_api": [
        "pre-existing condition — worker — work-related permanent impairment — work-related injury disease — shoulder"
      ],
      "body_parts": [
        "shoulder"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2021canlii133938",
      "year": 2021,
      "citation": "2021 CanLII 133938 (ON WSIB)",
      "decision_date": "2021-05-11",
      "docket_number": "20210025",
      "url": "https://canlii.ca/t/jlh84",
      "keywords_api": [
        "worker — knee — meniscus — pre-existing condition — tear"
      ],
      "body_parts": [
        "knee"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii132548",
      "year": 2022,
      "citation": "2022 CanLII 132548 (ON WSIB)",
      "decision_date": "2022-12-23",
      "docket_number": "20230021",
      "url": "https://canlii.ca/t/jvt56",
      "keywords_api": [
        "pre-existing condition — worker — annular tear — satchel — initial entitlement"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii132539",
      "year": 2022,
      "citation": "2022 CanLII 132539 (ON WSIB)",
      "decision_date": "2022-12-16",
      "docket_number": "20230018",
      "url": "https://canlii.ca/t/jvt53",
      "keywords_api": [
        "worker — pre-existing condition — work-related injury — sciatica — initial entitlement to benefits"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii132540",
      "year": 2022,
      "citation": "2022 CanLII 132540 (ON WSIB)",
      "decision_date": "2022-12-01",
      "docket_number": "20230013",
      "url": "https://canlii.ca/t/jvt4x",
      "keywords_api": [
        "worker — shoulder — surgery — pre-existing condition — accident"
      ],
      "body_parts": [
        "shoulder"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii128917",
      "year": 2022,
      "citation": "2022 CanLII 128917 (ON WSIB)",
      "decision_date": "2022-11-17",
      "docket_number": "20230006",
      "url": "https://canlii.ca/t/jv6mn",
      "keywords_api": [
        "worker — pre-existing condition — disease — electrocution type injury — tendinosis"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii121953",
      "year": 2022,
      "citation": "2022 CanLII 121953 (ON WSIB)",
      "decision_date": "2022-11-08",
      "docket_number": "20220143",
      "url": "https://canlii.ca/t/jtn0r",
      "keywords_api": [
        "pre-existing condition — worker — atopic — irritant contact dermatitis — eczema"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii112764",
      "year": 2022,
      "citation": "2022 CanLII 112764 (ON WSIB)",
      "decision_date": "2022-09-30",
      "docket_number": "20220125",
      "url": "https://canlii.ca/t/jt7z5",
      "keywords_api": [
        "pre-existing condition — worker — shoulder — rotator cuff tears — accident"
      ],
      "body_parts": [
        "shoulder"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii89425",
      "year": 2022,
      "citation": "2022 CanLII 89425 (ON WSIB)",
      "decision_date": "2022-07-15",
      "docket_number": "20220101",
      "url": "https://canlii.ca/t/js5ml",
      "keywords_api": [
        "pre-existing conditions — worker — stretcher — pre-existing condition — entitlement"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii89430",
      "year": 2022,
      "citation": "2022 CanLII 89430 (ON WSIB)",
      "decision_date": "2022-06-29",
      "docket_number": "20220097",
      "url": "https://canlii.ca/t/js5mg",
      "keywords_api": [
        "pre-existing condition — ankle — worker — all-terrain vehicle — fracture"
      ],
      "body_parts": [
        "ankle"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii68188",
      "year": 2022,
      "citation": "2022 CanLII 68188 (ON WSIB)",
      "decision_date": "2022-06-17",
      "docket_number": "20220073",
      "url": "https://canlii.ca/t/jr41w",
      "keywords_api": [
        "worker — pre-existing condition — knee — pre-injury duties — work"
      ],
      "body_parts": [
        "knee"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii54934",
      "year": 2022,
      "citation": "2022 CanLII 54934 (ON WSIB)",
      "decision_date": "2022-06-17",
      "docket_number": "20220055",
      "url": "https://canlii.ca/t/jpz5j",
      "keywords_api": [
        "worker — rotator cuff tear — due to a pre-existing condition — work incident — enhanced"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii89428",
      "year": 2022,
      "citation": "2022 CanLII 89428 (ON WSIB)",
      "decision_date": "2022-06-09",
      "docket_number": "20220096",
      "url": "https://canlii.ca/t/js5mf",
      "keywords_api": [
        "avascular necrosis — pre-existing condition — worker — hip — smoking"
      ],
      "body_parts": [
        "hip"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii74706",
      "year": 2022,
      "citation": "2022 CanLII 74706 (ON WSIB)",
      "decision_date": "2022-05-30",
      "docket_number": "20220092",
      "url": "https://canlii.ca/t/jrj4h",
      "keywords_api": [
        "hypertrophic cardiomyopathy — pre-existing condition — worker — cost relief — severity"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii44783",
      "year": 2022,
      "citation": "2022 CanLII 44783 (ON WSIB)",
      "decision_date": "2022-05-05",
      "docket_number": "20220050",
      "url": "https://canlii.ca/t/jph04",
      "keywords_api": [
        "shoulder — worker — pre-existing condition — pre-accident state — dislocation"
      ],
      "body_parts": [
        "shoulder"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii68179",
      "year": 2022,
      "citation": "2022 CanLII 68179 (ON WSIB)",
      "decision_date": "2022-04-28",
      "docket_number": "20220068",
      "url": "https://canlii.ca/t/jr41q",
      "keywords_api": [
        "pre-existing condition — extensor carpi ulnaris tendon — orthopaedic surgeon — worker — wrist"
      ],
      "body_parts": [
        "wrist"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii44782",
      "year": 2022,
      "citation": "2022 CanLII 44782 (ON WSIB)",
      "decision_date": "2022-04-21",
      "docket_number": "20220048",
      "url": "https://canlii.ca/t/jph02",
      "keywords_api": [
        "pre-existing condition — knee — indicated the worker — return to work — patellofemoral compartment"
      ],
      "body_parts": [
        "knee"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii33319",
      "year": 2022,
      "citation": "2022 CanLII 33319 (ON WSIB)",
      "decision_date": "2022-03-10",
      "docket_number": "20220035",
      "url": "https://canlii.ca/t/jnx0l",
      "keywords_api": [
        "pre-existing condition — curtains — severity — cost relief — worker"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii21320",
      "year": 2022,
      "citation": "2022 CanLII 21320 (ON WSIB)",
      "decision_date": "2022-02-25",
      "docket_number": "20220023",
      "url": "https://canlii.ca/t/jn8pm",
      "keywords_api": [
        "pre-existing condition — rotator cuff tears — worker — degenerative changes — shoulder"
      ],
      "body_parts": [
        "shoulder"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii33329",
      "year": 2022,
      "citation": "2022 CanLII 33329 (ON WSIB)",
      "decision_date": "2022-02-12",
      "docket_number": "20220030",
      "url": "https://canlii.ca/t/jnx0h",
      "keywords_api": [
        "pre-existing condition — worker — pre-existing psychological — cost relief — recovery from the compensable"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii33325",
      "year": 2022,
      "citation": "2022 CanLII 33325 (ON WSIB)",
      "decision_date": "2022-02-11",
      "docket_number": "20220024",
      "url": "https://canlii.ca/t/jnx0b",
      "keywords_api": [
        "worker — pre-existing condition — shoulder partial tear — employer — trays"
      ],
      "body_parts": [
        "shoulder"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii44777",
      "year": 2022,
      "citation": "2022 CanLII 44777 (ON WSIB)",
      "decision_date": "2022-02-04",
      "docket_number": "20220038",
      "url": "https://canlii.ca/t/jpgzt",
      "keywords_api": [
        "worker — pre-existing condition — low blood sugar — acute subarachnoid hemorrhage — injury"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2022canlii8151",
      "year": 2022,
      "citation": "2022 CanLII 8151 (ON WSIB)",
      "decision_date": "2022-01-05",
      "docket_number": "20220011",
      "url": "https://canlii.ca/t/jm99r",
      "keywords_api": [
        "pre-existing condition — obesity — pre-accident disability — tongs — https"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2023canlii89189",
      "year": 2023,
      "citation": "2023 CanLII 89189 (ON WSIB)",
      "decision_date": "2023-06-22",
      "docket_number": "20230106",
      "url": "https://canlii.ca/t/k0f37",
      "keywords_api": [
        "worker — pre-existing condition — entry-level wage — specialty clinic — knee"
      ],
      "body_parts": [
        "knee"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2023canlii89201",
      "year": 2023,
      "citation": "2023 CanLII 89201 (ON WSIB)",
      "decision_date": "2023-05-08",
      "docket_number": "20230107",
      "url": "https://canlii.ca/t/k0f38",
      "keywords_api": [
        "worker — pre-existing condition — employer — re-employment obligations — work-related injury disease"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2023canlii34285",
      "year": 2023,
      "citation": "2023 CanLII 34285 (ON WSIB)",
      "decision_date": "2023-03-06",
      "docket_number": "20230045",
      "url": "https://canlii.ca/t/jwwhn",
      "keywords_api": [
        "worker — knee — pain — pre-existing condition — benefits for a non-organic condition"
      ],
      "body_parts": [
        "knee"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2023canlii24815",
      "year": 2023,
      "citation": "2023 CanLII 24815 (ON WSIB)",
      "decision_date": "2023-02-03",
      "docket_number": "20230032",
      "url": "https://canlii.ca/t/jwg6g",
      "keywords_api": [
        "pre-existing condition — worker — neuropathic pain — hypothyroidism — clinicians"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2023canlii13768",
      "year": 2023,
      "citation": "2023 CanLII 13768 (ON WSIB)",
      "decision_date": "2023-01-16",
      "docket_number": "20230019",
      "url": "https://canlii.ca/t/jvt54",
      "keywords_api": [
        "pre-existing condition — worker — pre-existing conditions — diabetes — entitlement to cost relief"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2025canlii111684",
      "year": 2025,
      "citation": "2025 CanLII 111684 (ON WSIB)",
      "decision_date": "2025-03-26",
      "docket_number": "20250049",
      "url": "https://canlii.ca/t/kg7xz",
      "keywords_api": [
        "pre-existing condition — work-related injury disease — symptoms — pain — medical"
      ],
      "body_parts": [],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2025canlii39071",
      "year": 2025,
      "citation": "2025 CanLII 39071 (ON WSIB)",
      "decision_date": "2025-01-30",
      "docket_number": "20250027",
      "url": "https://canlii.ca/t/kbwhb",
      "keywords_api": [
        "degrees — in-between values — range — rating for their neck injury — pre-existing condition"
      ],
      "body_parts": [
        "neck"
      ],
      "public_outcome": "Unknown",
      "deep_dive_outcome": "Unknown",
      "predicted_outcome": "Granted",
      "predicted_confidence": 0.3734,
      "in_manual_review_queue": false
    },
    {
      "case_id": "2025canlii152661",
      "year": 2025,
      "citation": "2025 CanLII 152661 (ON WSIB)",
      "decision_date": "2025-01-16",
      "docket_number": "20260019",
      "url": "https://canlii.ca/t/kksf3",
      "keywords_api": [
        "Workplace health and safety — Initial entitlement — Cervical injury — Whether the worker has initial entitlement for a cervical injury arising from the December 28, 2022 accident — Case Manager denial overturned in part — Appeals Resolution Officer accepts accident, worker and employer criteria — Entitlement allowed for exacerbation of C8 nerve compression — Ongoing health care remitted — Objection allowed in part | Workplace health and safety — Workers’ compensation policy — Aggravation Basis — Application of OPM 15-02-04 where pre-accident impairment and minor accident found — Pre-accident impairment established by prior cervical surgeries and imaging — Maneuvering a 100 pound unit assessed as minor accident — Entitlement limited to aggravation basis until pre-accident state — Initial entitlement allowed on aggravation basis | Workplace health and safety — Reporting — Delay in reporting — Whether a 45 week delay in reporting a neck injury defeats entitlement — Consistent early symptoms documented despite unclear initial diagnosis — Family physician queried brachial plexus injury and referred to neurology — Claims not denied solely due to pre-existing conditions — Delay does not bar entitlement — Objection allowed in part | Workplace health and safety — Causation — Medical compatibility — Whether mechanism of injury is compatible with C8 radiculopathy — Heavy pushing and pulling of heat exchanger could exacerbate C8 nerve compression — Neurologist evidence accepted including acute right C8 radiculopathy — EMG and MRI findings considered — Compatibility criterion met under OPM 11-01-01 — Initial entitlement confirmed on aggravation basis"
      ],
      "body_parts": [
        "neck"
      ],
      "public_outcome": "Allowed - Full",
      "deep_dive_outcome": "Allowed - Full",
      "predicted_outcome": null,
      "predicted_confidence": null,
      "in_manual_review_queue": false
    }
  ]
}