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Ultrasonography of the ankle and the hindfoot.

High-resolution ultrasonography (US) has proved an excellent noninvasive and inexpensive modality for examining the extremities. This pictorial essay illustrates the US appearance of bony and soft-tissue abnormalities of the ankle and the hindfoot. The role of US as an adjunct technique to complement conventional radiography is stressed. The advantages of US in examining traumatic, inflammatory and infectious lesions and soft-tissue masses are discussed.