Open Mouth Odontoid

Aka: Open Mouth Odontoid, Odontoid View Cervical Spine XRay

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II. Anatomy

  1. Axis (C1)
    1. orthoSpineVertebraeCervical1AtlasGrayBB86.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  2. Odontoid (C2) Lateral
    1. orthoSpineVertebraeCervical2LateralGrayBB88.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  3. Odontoid (C2) from Above
    1. orthoSpineVertebraeCervical2GrayBB87.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  4. C1 on C2
    1. orthoSpineC1to2XsGrayBB308.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)

III. Evaluation: Adequate film criteria

  1. Entire odontoid and lateral borders of C1-C2 seen
  2. C1-2 Fractures are very high risk and more common at the extremes of age (very young and old)

IV. Evaluation: Alignment

  1. Lateral borders of c1 and c2 Vertebrae should line up
  2. Vertebral landmarks shifted in on one side
    1. Should be shifted out on other side

V. Evaluation: Bony Margins

  1. Odontoid should have uninterrupted cortex to C2
  2. Odontoid view C1 and C2 should line up

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