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Accessory Bone PainAka: Painful Accessory Bones, Os Trigonum Syndrome, Os Trigonum, Accessory Tarsal Navicular

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  1. Epidemiology
    1. Affects 10% of population
  2. 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
  3. Mechanism
    1. Jumping activities
    2. Ballet participation
  4. Signs
    1. Stieda's process
    2. Pain on extreme plantar flexion
  5. Radiology: Foot XRay
    1. Compare with XRay of opposite foot

Os trigonum disorder (C1457873)

ConceptsCongenital Abnormality (T019)
EnglishOs trigonum, Os trigonum disorder
Spanishhueso trigono
Parent ConceptsSupernumerary tarsal bone (C0685460)
SourcesMTH, SCTSPA, SNOMEDCT
Derived from the NIH UMLS (Unified Medical Language System)



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