Odontoid fracture classification
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.
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