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Allman classification of clavicle fractures

Classification

GROUP I – Middle third fractures (80%)

GROUP II – Distal third fractures (15%)

  • Type I – Minimally displaced / interligamentous
  • Type II – Displaced fractures, fracture medial to the coracoclavicular ligaments
    • IIA – Both ligaments (conoid and trapezoid) attached to the distal fragment
    • IIB – Conoid torn, trapezoid attached to the distal fragment
  • Type III – Fractures involving articular surface
  • Type IV – intact coracoclavicular ligaments attached to periosteal sleeve plus proximal fragment displaced
  • Type V – Comminuted

GROUP III – Fracture of the proximal third (5%)

  • Type I – Minimally displacement
  • Type II – Displaced
  • Type III – Intra-articular
  • Type IV – Epiphyseal separation
  • Type V – Comminuted

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