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AO classification of fractures

Diaphyseal

  1. Simple fractures with disruption of at least 90% bone circumfrance
  2. Multifragmentary but with some contact maintained between proximal & distal fragment
  3. Complex fracture with no contact between proximal & distal framents

,B or C 1,2 or 3 depending on basic fracture configuration

  1. Spiral fracture
  2. Oblique fracture
  3. Transverse Fracture

Articular

  1. Fractures that do not involve joint surface (1,2 or 3 simple to comminuted)
  2. Part of joint involved but remainder still connected to diaphysis
  3. Complete articular fracture with complete separartion of diaphysis