The commonest classification of these fractures is the Anderson D’Alonzo classification in 1974

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.

The Roy-Camille classification scheme aids the management of odontoid fractures. In general anterior oblique fractures are more stable than the posterior oblique fractures.

In 2005, Grauer et al. proposed a modified, treatment-oriented classification of odontoid fractures. This classification divided odontoid fractures into 3 groups, especially type II fractures into three subgroups (subclass A, B, and C) ¹⁾.

For children see Classification of Hosalkar