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

Explanation

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Figures

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Reference(s)

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