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