Spinal fracture classification
The information below is contained in papers found in the literature search carried out to inform this clinical decision making tool.
Odontoid Peg Fracture Classification / D’Alonso & Anderson classification
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 peg
- below the level of the transverse band of the cruciform ligament
- unstable
- high risk of non-union
Type III
- through the odontoid peg 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
Hangman/Pedicle Fracture Classification
Levine and Edwards classification is used to classify Hangman Fractures of C2 (also known as traumatic spondylolisthesis of axis).
Type I
- fracture with <3 mm antero-posterior deviation
- no angular deviation
Type II
- fracture with >3 mm antero-posterior deviation
- significant angular deviation
- disruption of posterior longitudinal ligament
Type IIa
- the fracture line is horizontal/oblique (instead of vertical)
- significant angular deviation without anterior translation
Type III
- type I with bilateral facet joint dislocation
Guidelines
National Institute of Health and Care Excellence (NICE). Spinal injury guideline: assessment and initial management. NG41. 2016