From the case:
Hallux valgus - first metatarsophalangeal angle
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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.
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