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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