Welcome to Classifications and Online Calculators in Radiology

This site was build along with the Atlas of Radiology Images to support your knowledge in radiology.

You will find here:

that are used in radiology and related fields with free access.


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The concept of this website is based on a previous site that was founded in 2008 and is still up and running. The website is composed as a book, where all sources are properly referenced, according to a good practice in scientific publications.

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    Anderson and D'Alonzo classification of odontoid fractures, fractures of dens axis (C2)

    Odontoid fractures are classified into three types. Type III is not an odontoid fracture but rather fracture of the vertebral body.

    Type Description
    Type I avulsion fracture of the tip of dens (rare)
    Type II fracture at the base of dens - most common (cca 2/3)
    Type III fracture extends into the body of the vertebra, does not involve dens (cca 1/3)


    1. Anderson LD, D’Alonzo RT. Fractures of the odontoid process of the axis. J Bone Joint Surg Am. 1974 Dec;56(8):1663–74.
    2. Chi Y-L, Wang X-Y, Xu H-Z, Lin Y, Huang Q-S, Mao F-M, et al. Management of odontoid fractures with percutaneous anterior odontoid screw fixation. Eur Spine J. 2007 Aug;16(8):1157–64

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