Freiberg originally described avascular necrosis of the second metatarsal head. This is the most common metatarsal to be affected, but we should not, perhaps, give each of the metatarsals an associated eponymous name and rather stick with Freiberg's for them all! The aetiology is the same.

 

AVN of the third metatarsal head

AVN of the third metatarsal head.