Anderson and D'Alonzo classification of odontoid process fracture
Citation, DOI, disclosures and article data
Citation:
Hacking C, Niknejad M, Molinari A, et al. Anderson and D'Alonzo classification of odontoid process fracture. Reference article, Radiopaedia.org (Accessed on 20 Jan 2025) https://doi.org/10.53347/rID-41604
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41604
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Disclosures:
At the time the article was created Craig Hacking had no recorded disclosures.
View Craig Hacking's current disclosures
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Disclosures:
At the time the article was last revised Mohammad Niknejad had no financial relationships to ineligible companies to disclose.
View Mohammad Niknejad's current disclosures
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- Anderson and D'Alonzo classification of odontoid process fractures
The Anderson and D'Alonzo classification is the most commonly used classification of fractures of the odontoid process of C2 1.
Another classification system is the Roy-Camille classification, which aids more in the management of odontoid fractures.
Classification
-
type I
rare
fracture of the upper part of the odontoid peg (generally oblique)
above the level of the transverse band of the cruciform ligament
usually considered stable
-
type II
most common
transverse course 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 IIa
type II fractures with comminution at the odontoid base
Hadley 2 described this type of fracture which has a significantly increased risk of nonunion when treated non-operatively compared with classical type II fractures
represents 5-10% of type II fractures
-
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
Quiz questions
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References
- Anderson L & D'Alonzo R. Fractures of the Odontoid Process of the Axis. J Bone Joint Surg Am. 1974;56(8):1663-74. - Pubmed
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Cases:
- Odontoid fracture (paediatric)
- Type II dens fracture
- Type 1 C2 odontoid fracture
- Anderson and D'Alonzo type III complex odontoid fracture
- Odontoid fracture type II and Jefferson fracture
- Odontoid fracture type II (Anderson-D’Alonzo classification)
- Atlas (type 3b subtype 1) and axis (Anderson and D'Alonzo type 3, Roy-Camille type 2) fractures
- Odontoid fracture (Anderson and D'Alonzo type 3, Roy-Camille type 1)
- Odontoid fracture (Anderson and D'Alonzo type 2, Roy-Camille type 3)
- Odontoid fracture (Anderson and D'Alonzo type 3, Roy-Camille type 2)
- Anderson and D'Alonzo classification of C2 odontoid fractures (diagrams)
- Odontoid fracture
- Odontoid fracture - type 2
- Type III Odontoid fracture
- Type II odontoid fracture
- Odontoid fracture
- Odontoid (peg) fracture
- Jefferson fracture
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