title: Bipartite hallucal sesamoid bones: relationship with hallux valgus and metatarsal index.
abstract: OBJECTIVE
  The objective was to relate the incidence of the partition of the hallucal sesamoid bones to the size of the first metatarsal and the hallux valgus deformity.
  
  
  METHODS
  In a sample of 474 radiographs, the frequency of appearance of bipartite sesamoids was studied. The length and relative protrusion of the first metatarsal, and the hallux abductus angle, were measured and compared between the feet with and without sesamoid partition.
  
  
  RESULTS
  The results showed that 14.6% of the feet studied had at least one partite sesamoid, that the sesamoid most frequently divided was the medial, and that unilateral partition was the most common. No difference was found in the incidence of partite sesamoids between men and women, or between left and right feet.
  
  
  CONCLUSIONS
  Protrusion and length of the first metatarsal are greater in feet with partite sesamoids than in feet without this condition. A significantly higher incidence of bipartite medial sesamoid was obtained in feet with hallux valgus compared with normal feet.
authors.affiliation: Department of Podiatrics, University of Seville, Seville, Spain. pmunuera@us.es
authors.forename: Pedro V
authors.initials: PV
authors.lastname: Munuera
authors.forename: Gabriel
authors.initials: G
authors.lastname: Domínguez
authors.forename: María
authors.initials: M
authors.lastname: Reina
authors.forename: Piedad
authors.initials: P
authors.lastname: Trujillo
mesh_terms: D000328:Adult; D001837:Body Weights and Measures; D005260:Female; D006214:Hallux / Q000000981:diagnostic imaging*; D006215:Hallux Valgus / Q000000981:diagnostic imaging*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008297:Male; D008682:Metatarsal Bones / Q000000981:diagnostic imaging*; D011856:Radiographic Image Enhancement / Q000379:methods; D012716:Sesamoid Bones / Q000000981:diagnostic imaging*