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 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.

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