Odontoid fracture

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Odontoid process fracture ~~(also~~,also known as the PEG or dens fracture~~) occurs~~, 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

The commonest classification of these fractures is the Anderson and D'Alonzo classification ⁵:

type I
- rare
- fracture of the upper part of the odontoid peg
- above the level of the transverse band of the cruciform ligament
- usually considered stable
type II
- most common
- fracture at the base of the odontoid
- below the level of the transverse band of the cruciform ligament
- unstable
- high risk of non-union
type III
- through the odontoid and into the lateral masses of C2
- relatively stable if not excessively displaced
- best prognosis for healing because of the larger surface area of the fracture

Differential diagnosis

-<p><strong>Odontoid process fracture</strong> (also known as the <strong>PEG</strong> or <strong>dens fracture</strong>) occurs where there is a fracture through the <a href="/articles/odontoid-process">odontoid process</a> of <a href="/articles/c2">C2</a>.</p><h4>Pathology</h4><p>The mechanism of injury is variable, and can occur both during flexion or extension with or without compression <sup>5</sup>. </p><h5>Classification</h5><p>The commonest classification of these fractures is the Anderson and D'Alonzo classification <sup>5</sup>:</p><ul>
+<p><strong>Odontoid process fracture</strong>,<strong> </strong>also known as the <strong>PEG</strong> or <strong>dens fracture</strong>, occurs where there is a fracture through the <a href="/articles/odontoid-process">odontoid process</a> of <a href="/articles/c2">C2</a>.</p><h4>Pathology</h4><p>The mechanism of injury is variable, and can occur both during flexion or extension with or without compression <sup>5</sup>. </p><h5>Classification</h5><p>The commonest classification of these fractures is the Anderson and D'Alonzo classification <sup>5</sup>:</p><ul>

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Odontoid fracture

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Pathology

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