II. Epidemiology

  1. Affects 10% of population

III. Anatomy

  1. Os Trigonum (Variant present in 14-25%)
    1. Adjacent to the Talus posterior margin
  2. Accessory Tarsal Navicular (Variant present in 4-14%)
    1. Adjacent to medial and posterior Tarsal Navicular margin

IV. Mechanism

  1. Jumping activities
  2. Ballet participation

V. Signs

  1. Stieda's process
  2. Pain on extreme plantar flexion

VI. Radiology: Foot XRay

  1. Compare with XRay of opposite foot

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Ontology: Os trigonum disorder (C1457873)

Concepts Congenital Abnormality (T019)
SnomedCT 134219008
Spanish hueso trígono, hueso triangular del tarso (trastorno), hueso triangular del tarso, hueso trígono (trastorno), Os trigonum
Portuguese Osso trígono
German Os trigonum
Czech Os trigonum
Dutch os trigonum
French Os trigone
Italian Os trigonum
Japanese 足根三角骨, ソクコンサンカクコツ, ソッコンサンカクコツ
Hungarian Os trigonum
English Os trigonum, Os trigonum (disorder), Os trigonum disorder