Osteochondritis dissecans can be classified at surgery into 4 stages:
-
stage I
stable
lesion in continuity with the host bone
covered by intact cartilage
-
stage II
stable on probing
partial discontinuity of the lesion from the host bone
-
stage III
unstable on probing
fragment not dislocated
complete discontinuity of the "dead in situ" lesion
-
stage IV
dislocated fragment
Classification according to International Cartilage Repair Society.
Distinguishing stage II from III can be difficult on MRI.
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