transient bone marrow edema
Regional migratory osteoporosis, migrating arthralgia.
Self-limited. No Hx. of trauma. Wt-bearing joint of lower extremity. Proximal to distal spread. Interval 2~12 months. Middle-aged men, systemic osteoporosis combined with normal local loading, minor trauma, cigarette smoking. Subchondral sparing 22%.
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