- 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