Osteochondritis dissecans of the knee

Dr Henry Knipe and A.Prof Frank Gaillard et al.

Osteochondritis dissecans (OCD) most commonly affects the knee. See osteochondritis dissecans article for a general discussion.

The condition occurs bilaterally in 25% of cases, and has a characteristic distribution 2,4,6:

  • medial condyle: ~78.5% (range 70-85%)
    • "classic" lateral surface of the medial condyle: ~70%
  • lateral condyle: 15%
    • inferocentral portion: 13%
    • anterior surface: 2%
  • patella: ~7.5% (range 5-10%)
    • typically inferomedial
  • patellofemoral groove (femoral trochlea): <1%
  • weight-bearing surface of the tibia: uncommon

These are discussed in the general article on osteochondritis dissecans.

The differential diagnosis includes:

  • normal fusing apophysis: painless
  • acute osteochondral fracture

In older patients consider:

Knee pathology

The knee is a complex synovial joint that can be affected by a range of pathologies:

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Article information

rID: 1798
Tag: knee
Synonyms or Alternate Spellings:
  • OCD of knee
  • Osteochondritis dissecans of knee
  • OCD knee
  • Osteochondritis dissecans affecting the knee

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Cases and figures

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    Figure1: illustration - distribution of changes
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    Case 1
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    Case 2
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    OCD

Coronal STAIR
    Case 3
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    Case 4
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     Case 5
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    Case 6: patella
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