Odontoid fracture

Dr Jeremy Jones et al.

Odontoid process fracture, also known as the peg or dens fracture, occurs where there is a fracture through the odontoid process of C2.

Pathology

The mechanism of injury is variable, and can occur both during flexion or extension with or without compression 5.

Classification

There are two classification systems 5,6

  • Anderson and D'Alonzo
    • most commonly used
    • describes level of fracture line (i.e. through tip, base, or lateral masses)
  • Roy-Camille classification
    • has been shown to better correlate with prognosis
    • ​describes plane of fracture and displacement

Differential diagnosis


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Article Information

rID: 6370
Synonyms or Alternate Spellings:
  • Odontoid process fracture
  • Dens fracture
  • Odontoid peg fracture
  • Odontoid fractures
  • Odontoid peg fractures
  • Dens fractures
  • Odontoid process fractures
  • Anderson and D'Alonzo classification

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    Figure 1: Anderson and D'Alzonzo classification
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    PEG fracture
    Case 1
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    Case 2
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    Odontoid Fracture...
    Case 3: type II
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    Case 4: type III
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    Case 5
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