*Freiberg's infraction* is a condition specific to the lesser metatarsal heads, most commonly the second metatarsal. Also known as avascular necrosis, or AVN, this condition results in a focal loss of blood supply to the metatarsal head. Freiberg's infraction occurs at the metaphysis of the metatarsal bone. The metaphysis in the region where the primary or nutrient artery of the bone supplies the distal metatarsal. Loss of blood supply to the metaphysis (infraction) results in collapse of the metatarsal head.
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