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Duke Orthopaedics
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Wheeless' Textbook of Orthopaedics

AO Classification (Muller)



- A: Extra-articular (Transverse)

- B: Unicondylar fracture
       - subdivided into lateral condyle sagittal, and medial condyle saggital and coronal;
       - deforming forces: gastrocnemius
       - of special importance is B III (Coronal or Hoffa fracture), where only soft tissue attachment is the posterior capsule, that behaves 
             like alarge loose fragment in the joint;

- C: Bicondylar Fracture
       - there is shortening & anterior displacement of shaft caused by unrestricted pull of the quadriceps and hamstring muscles along w/
              displacement caused by gastrocnemius, which causes posterior angulation and rotation;
       - described as noncomminuted supracondylar (T or Y), supracondylar frx;
       - w/ type C 3:
              - note that the condylar blade plate may be contraindicated;
              - consider instead a butress plate;
              - need to restore condylar width, hence consider avoiding lag screws, and always consider need for bone graft



Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Monday, September 12, 2011 12:15 pm