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.
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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- 2. Karasick D, Wapner KL. Hallux valgus deformity: preoperative radiologic assessment. AJR Am J Roentgenol. 1990;155 (1): 119-23. AJR Am J Roentgenol (citation) - Pubmed citation
- 3. George HL, Casaletto J, Unnikrishnan PN et-al. Outcome of the scarf osteotomy in adolescent hallux valgus. J Child Orthop. 2009;3 (3): 185-90. doi:10.1007/s11832-009-0177-6 - Free text at pubmed - Pubmed citation
- 4. Berg RP, Olsthoorn PG, Pöll RG. Scarf osteotomy in hallux valgus: a review of 72 cases. Acta Orthop Belg. 2007;73 (2): 219-23. Pubmed citation
- 5. Crevoisier X, Mouhsine E, Ortolano V et-al. The scarf osteotomy for the treatment of hallux valgus deformity: a review of 84 cases. Foot Ankle Int. 2002;22 (12): 970-6. Pubmed citation