Classification of Pilon Fractures

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- Classification: (Ruedi-Allgower):
    - type I: Pilon Frx
          - malleolar frx w/ significant axial load at time of injury & therefore large posterior plafond fragments;
    - type II: Pilon Frx
          - spiral extension frx;
    - type III: Pilon Frx
          - type III frxs are central compression injuries w/ impaction of talus into distal tibia
                w/ or w/o concomitant fibular frx;
          - subdivided as discussed into subgroups A-C depending on degree of displacement of articular
                surface & presence or absence of comminution and/or impaction;
    - type A:
          - minimal or no anterior tibial cortical communition, > 2 large tibial articular fragments, and
                usually a fibular fracture of transverse or short oblique at the level of the plafond (or ankle joint);
    - type B:
          - results from severe axial compression force, causing distal tibial bony impaction and comminution;