{
  "url": "https://dantelabs.com/traits/abnormal-patella-morphology",
  "trait": {
    "bundleId": "2026.10.17-8666dff2",
    "release": "2026-09-01",
    "slug": "abnormal-patella-morphology",
    "id": "HP:0003045",
    "name": "Abnormal kneecap",
    "label": "Abnormal patella morphology",
    "definition": "Abnormality of the patella (knee cap).",
    "synonyms": [
      "Abnormality of the patella",
      "Patellar abnormality"
    ],
    "systems": [
      {
        "slug": "abnormality-of-limbs",
        "name": "Abnormality of limbs",
        "url": "https://dantelabs.com/traits/abnormality-of-limbs"
      },
      {
        "slug": "abnormality-of-the-musculoskeletal-system",
        "name": "Abnormality of the musculoskeletal system",
        "url": "https://dantelabs.com/traits/abnormality-of-the-musculoskeletal-system"
      }
    ],
    "broader": [
      {
        "slug": "abnormal-knee-morphology",
        "name": "Abnormal knee morphology",
        "url": "https://dantelabs.com/traits/abnormal-knee-morphology"
      }
    ],
    "narrower": [
      {
        "slug": "patellar-dislocation",
        "name": "Dislocated kneecap",
        "genes": 70,
        "url": "https://dantelabs.com/traits/patellar-dislocation"
      },
      {
        "slug": "aplasia-hypoplasia-of-the-patella",
        "name": "Absent/small kneecap",
        "genes": 9,
        "url": "https://dantelabs.com/traits/aplasia-hypoplasia-of-the-patella"
      },
      {
        "slug": "patellar-subluxation",
        "name": "Partial knee cap dislocation",
        "genes": 8,
        "url": "https://dantelabs.com/traits/patellar-subluxation"
      },
      {
        "slug": "delayed-patellar-ossification",
        "name": "Delayed bone maturation of the knee cap",
        "genes": 2,
        "url": "https://dantelabs.com/traits/delayed-patellar-ossification"
      },
      {
        "slug": "double-layered-patella",
        "name": "Double-layered patella",
        "genes": 1,
        "url": "https://dantelabs.com/traits/double-layered-patella"
      },
      {
        "slug": "dysplastic-patella",
        "name": "Dysplastic patella",
        "genes": 1,
        "url": "https://dantelabs.com/traits/dysplastic-patella"
      },
      {
        "slug": "lateral-displacement-of-patellae",
        "name": "Lateral displacement of patellae",
        "genes": 1,
        "url": "https://dantelabs.com/traits/lateral-displacement-of-patellae"
      },
      {
        "slug": "patellar-overgrowth",
        "name": "Patellar overgrowth",
        "genes": 1,
        "url": "https://dantelabs.com/traits/patellar-overgrowth"
      }
    ],
    "genes": [
      {
        "slug": "col9a1",
        "symbol": "COL9A1",
        "hgnc": "HGNC:2217",
        "name": "collagen type IX alpha 1 chain",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/col9a1"
      },
      {
        "slug": "col9a2",
        "symbol": "COL9A2",
        "hgnc": "HGNC:2218",
        "name": "collagen type IX alpha 2 chain",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/col9a2"
      },
      {
        "slug": "col9a3",
        "symbol": "COL9A3",
        "hgnc": "HGNC:2219",
        "name": "collagen type IX alpha 3 chain",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/col9a3"
      },
      {
        "slug": "lmx1b",
        "symbol": "LMX1B",
        "hgnc": "HGNC:6654",
        "name": "LIM homeobox transcription factor 1 beta",
        "frequency": "occasional",
        "diseases": 1,
        "url": "https://dantelabs.com/genes/lmx1b"
      }
    ]
  }
}