title: [Accessory bones of the feet--radiological analysis of frequency].
abstract: OBJECTIVE
  Accessory bones are most commonly found on the feet and they represent an anatomic variant. They occur when there is a failure in the formation of a unique bone from separated centre of ossification. The aim of this study was to establish their frequency and medical significance.
  
  
  METHODS
  Anteroposterior and lateral foot radiography was performed in 270 patients aged of 20-80 years with a history of trauma (180) and rheumatology disease (90). The presence and distribution of accessory bones was analysed in relation to the total number of patients and their gender. The results are expressed in numeric values and in terms of percentage.
  
  
  RESULTS
  Accessory bones were identified in 62 (22.96%) patients: 29 (10.74%) of them were found in female patients and 33 (12.22%) in males. The most common accessory bones were as follows: os tibiale externum 50%, os pemroneum 29.03%, os trigonum 11.29%, os vaselianum 9.68%.
  
  
  CONCLUSIONS
  Accessory bones found in 23% of patients with trauma and some of rheumatological diseases. Their significance is demonstrated in the differential diagnosis among degenerative diseases, avulsion fractures, muscle and tendon trauma and other types of injuries which can cause painful affection of the foot, as well as in forensic practice.
authors.affiliation: Vojnomedicinska akademija, Beograd, Srbija. dramed.vlada@sezampro.yu
authors.forename: Vladica
authors.initials: V
authors.lastname: Vasiljević
authors.forename: Ljubo
authors.initials: L
authors.lastname: Marković
authors.forename: Jasenka
authors.initials: J
authors.lastname: Vasić-Vilić
authors.forename: Djura
authors.initials: D
authors.lastname: Mihajlović
authors.forename: Bojan
authors.initials: B
authors.lastname: Nikolić
authors.forename: Sasa
authors.initials: S
authors.lastname: Milosević
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005529:Foot Bones / Q000002:abnormalities* / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D055815:Young Adult