High-resolution ultrasonography (US) has proved an excellent noninvasi
ve and inexpensive modality for examining the extremities. This pictor
ial essay illustrates the US appearance of bony and soft-tissue abnorm
alities of the ankle and the hindfoot. The role of US as an adjunct te
chnique to complement conventional radiography is stressed. The advant
ages of US in examining traumatic, inflammatory and infectious lesions
and soft-tissue masses are discussed.