Transient osteoporosis of the talus.

Transient osteoporosis is a clinical syndrome of unknown etiology characterized by the acute onset of pain gradually worsening over several weeks to months. Radiographic changes occur, but laboratory studies are generally unremarkable. Transient osteoporosis of the talus appears to have a similar clinical appearance, radiographic findings, and successful response to conservative management as transient osteoporosis found elsewhere in the body and can be treated similarly. Awareness of this syndrome is important to avoid confusing it with a variety of other disorders of the talus that may have similar clinical presentations.