Berndt and Harty classification

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Berndt and Harty classification is used for osteochondral lesions of the talus.

Classification
  • stage I: subchondral bone compression (marrow edema)
  • stage II
    • stage IIa: subchondral cyst
    • stage IIb: incomplete separation of fragment
  • stage III: complete separation but no displacement
  • stage IV: displaced fragment