Hallux valgus

A hallux valgus is fixed abduction of the first metatarsophalangeal joint of the great toe. It is usually due to metatarsus primus varus which is medial deviation or adduction of the first metatarsal with an increased first - second metatarsal angle.

Radiographic appearance

Plain radiograph

A normal first metatarsophalangeal angle is <15° on an AP weight-bearing foot radiograph 2; anything greater indicates hallux valgus. The first - second intermetatarsal angle should be <9° on a weight-bearing foot radiograph 2.

There is a close association between the degree of metatarsus primus varus and hallux valgus. The combined deformities are present to some degree in most patients. Hallux valgus may be a result of metatarsus primus varus, and surgical correction is often based on this theory.

Treatment and prognosis

As a surgical intervention, the scarf osteotomy is a widely used method 4-5.

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Article information

rID: 5235
Section: Gamuts
Tag: foot
Synonyms or Alternate Spellings:
  • Hallux valgus deformity
  • Bunion
  • Bunions

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Cases and figures

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    Figure 1: first metatarsophalangeal angle
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    Case 1
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    Severe hallux val...
    Case 2
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    Case 3: with angles measured for assessment
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