Type I | Acromioclavicular (AC) ligament sprain; AC joint intact |
Type II | Acromioclavicular ligament torn, coracoclavicular (CC) ligament intact; AC joint subluxed |
Type III | AC and CC ligaments torn; complete dislocation of the joint |
Type IV | Complete dislocation with posterior displacement of distal clavicle into or through trapezius muscle |
Type V | Superior dislocation of the joint of one to three times the normal spacing, increasing the CC ligament distance two to three times normal; disruption of the deltotrapezial fascia |
Type VI | Complete dislocation with inferior displacement of distal clavicle into a subacromial or subcoracoid position |
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