Fact-sheet: Hallux valgus


Updated on 10/16/2024 at 8:38 PM

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Definition

Forefoot deformity combining lateral deviation of the hallux, most often associated with varus of the first metatarsal (metatarsus varus of M1).

Radiography

Weight-bearing AP radiograph of the forefoot:

  • Hallux valgus = M1-P1 angle of the 1st ray >12° in men and >15° in women (physiological valgus of 8-12° in men and 8-15° in women)
  • Metatarsus varus of M1 = M1-M2 angle of the 1st ray >10° (physiological varus of M1 = 5-10°)
  • Splayed forefoot = M1-M5 forefoot spread angle >25° (Normal = 15-25°)
  • Lateral subluxation of the base of P1 of the hallux
  • Lateral subluxation of the hallux sesamoids
  • Secondary osteoarthritis of the 1st MTP
  • Thickening of the medial subcutaneous soft tissues overlying the 1st MTP
  • Deviation and/or clawing of the 2nd toe

Hallux Valgus Avant-pied de face en charge Annoté

Weight-bearing lateral radiograph of the foot:

  • Dorsal deviation of the first metatarsal on the lateral view
  • Measurement of the Djian-Annonier medial arch apex angle
    Normal: 120-130°
  • Cavus foot < 120°
  • Flatfoot > 130°

Pied de profil en charge Angle de djian annonier annoté