Hallux valgus

A hallux valgus is a fixed abduction of the first metatarsophalangeal joint of the great toe. It is usually due to metatarsus primus varus which is a 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
Tag: foot
Synonyms or Alternate Spellings:
  • Hallux valgus deformity
  • Bunions
  • Bunion

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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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