Abnormality of the first metatarsal bone

What it means

An anomaly of the first metatarsal bone.

In contrast to the metatarsals 2-5, the first metatarsal is embryologically of phalangeal origin and as such equivalent to the proximal phalanges of the digits 2-5, whereas the proximal phalanx of the big toe is equivalent to the middle phalanges of the other digits. This term applies to abnormalities of the first metatarsal.

Rare diseases that can present with this1

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category