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.

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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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    Pauwels classification of femoral neck fractures - hip fracture

    Pauwels' classification divides femoral neck fractures into three grades according to the degrees of the inclination of the fracture line, so called Pauwels' angle. The distinction between grade II and III is often misinterpreted. Moreover, as originally pointed by Pauwels, the distinction between grade I and II should be also based on the presence of a shearing force, which can be neutralized by impaction. Therefore, some fractures with more vertical fracture line (>30 degrees) may still be considered grade I. Similarly, the distinction between grade II and grade III fractures is based on the presence of free torque, that distracts the upper part of the fracture line. If present, the fracture should be classified as grade III.

    Grade Pauwels' angle
    Pauwels I <30 degrees
    Pauwels II 30 - 50 degrees
    Pauwels III >50 degrees


    1. Nowakowski, A. M., Ochsner, P. E., Majewski, M. Classification of femoral neck fractures according to pauwels: interpretation and confusion. J Biomedical Science and Engineering. 2010;3:638–43.
    2. Pauwels, F. Der schenkelhalsbruch ein mechanisches problem. Z Orthop Ihre Grenzgeb. 1935;63.
    3. Bartonícek J. Pauwels’ classification of femoral neck fractures: correct interpretation of the original. J Orthop Trauma. 2001 Jul;15(5):358–60


      Pauwels classification of hip fractures - Pauwels angle, femoral neck

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