Hallux valgus - first metatarsophalangeal angle

Case contributed by Dr Samir Benoudina

First metatarsophalangeal angle

Case Discussion

The first metatarsophalangeal angle is used for evaluating the presence of a true hallux valgus deformity. It can only be measured on a radiograph performed whilst weightbearing.

It is the angle between the axis of the 1st metatarsal and the axis of the proximal phalanx of the 1st toe.

A normal angle is ≤15°. A greater value indicates hallux valgus.

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.