Freiberg disease (metatarsal avascular necrosis)

(A) Anteroposterior radiograph of the foot demonstrating early stage of Freiberg disease of the second metatarsal head (arrow).

(B) Anteroposterior radiograph of the foot demonstrating late stage Freiberg disease of the third metatarsal head (arrow). Characteristic findings are seen, including widening at the metatarsophalangeal joint, flattening of the metatarsal head, and subchondral sclerosis.