Imaging Features of Avascular Necrosis of the Foot and Ankle.

Avascular necrosis of the foot and ankle is a rare but important cause of pain and functional abnormality. This process may occur in any bone in the foot and ankle; however, it presents most often in characteristic locations. Understanding of key radiographic findings is important in management of these lesions. MRI is the most sensitive and specific method for detection and characterization of this abnormality.