Anderson D'Alonzo Type II

The fracture line is located in the odontoid peg itself, above the vertebral body of C2. The fracture surface is small and the fracture has up to 21% nonunion rate when treated conservatively.

Most often the fracture is transverse but may also be comminuted or oblique. The dens may be dislocated anteriorly or posteriorly (trans-dental luxation).