Foot

Accessory Bone Pain

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Accessory Bone Pain, Painful Accessory Bones, Os Trigonum Syndrome, Os Trigonum, Accessory Tarsal Navicular

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