Anderson D'Alonzo Type III

The fracture line is located in the vertebral body of C2 itself, underneath the odontoid peg. The fracture is in cancellous bone and therefore has a better healing potential with a nonunion rate of only 7% when treated conservatively according to Anderson and D’Alonzo. The fracture often enters the lateral atlantoaxial joint on one or both sides and may create an intraarticular step. The fracture may also extend into the isthmus.