Roy-Camille classification of odontoid process fracture

Last revised by Craig Hacking ◉ on 2 Aug 2021

Citation, DOI, disclosures and article data

Citation:

Thapa S, Hacking C, Elfeky M, et al. Roy-Camille classification of odontoid process fracture. Reference article, Radiopaedia.org (Accessed on 08 Mar 2025) https://doi.org/10.53347/rID-41595

DOI:

https://doi.org/10.53347/rID-41595

Permalink:

https://radiopaedia.org/articles/41595

rID:

41595

Article created:

9 Dec 2015, Subash Thapa

Disclosures:

At the time the article was created Subash Thapa had no recorded disclosures.

View Subash Thapa's current disclosures

Last revised:

2 Aug 2021, Craig Hacking ◉

Disclosures:

At the time the article was last revised Craig Hacking had no recorded disclosures.

View Craig Hacking's current disclosures

Revisions:

17 times, by 8 contributors - see full revision history and disclosures

Systems:

Head & Neck, Spine, Trauma

Sections:

Classifications

Tags:

trauma, classification, roy camille, odontoid fracture, snippet title

Synonyms:

Roy-Camille classification for odontoid process fracture
Roy-Camille classification

The Roy-Camille classification of fractures of the odontoid process of C2 depends on the direction of the fracture line ¹.

The level of fracture line as described by the Anderson and D’Alonzo classification is not predictive of the degree of instability or the risk of non-union. This classification scheme aids the management of odontoid fractures. In general, anterior oblique fractures are more stable than the posterior oblique fractures.

Classification

type I: oblique linear fracture in which its line slopes forward, with dens displacement in an anterior direction
type II: oblique linear fracture in which its line slopes backward, with dens displacement in a posterior direction
type III: horizontal fracture line and the dens displacement can be either anterior or posterior