University of Washington - Department of Neurological Surgery
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Classification of Odontoid Fractures

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Type I: through the tip of the dens: rare Type II: through the base of the odontoid: most common Type III: extends down into the body of the atlas

Anderson - D'Alonzo Classification Anderson LD, D'Alonzo RT:
Fractures of the odontoid process of the axis. J Bone Joint Surg (Am) 1974; 56A:1663-1674

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