Spontaneous osteonecrosis of the talar head
Foot pain on weight bearing. No history of trauma.
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Diffuse bone oedema of the talar head and adjacent neck. Small signal void subchondrla lines parallel to the joint surface of the talar head. Slightly narrowed joint spaces. No further signs of degenerative joint disease.
This finding is quite rare in the talar head. It probably has the same aetiology as spontaneous osteonecrosis of the knee or Freibergs infraction of the 2nd metatarsal.