Neer classification of distal clavicle fractures

  • Type I: between acromioclavicular joint and coracoclavicular ligament attachment, intact ligaments, minimal displacement
  • Type II: unstable medial clavicle
  • Type IIA: medial to coracoclavicular ligaments
  • Type IIB: lateral to ruptured coracoclavicular ligaments or between torn conoid and intact trapezoid parts of coracoclavicular ligament
  • Type III: at articular surface of acromioclavicular joint