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AC Joint Dislocations
The acromioclavicular (AC) Joint is commonly injured when a person falls onto their shoulder.
The AC Joint consists of three ligaments:
- acromioclavicular ligament (AC)
- coracoacromial ligament (CA)
- coracoclavicular ligament (CC)
Injuries to this joint are classified as Type I – Type VI and involve sprain or tears of the AC or CC ligaments
- Type I – Is a sprain of the joint without complete tear of either the AC or CC ligament
- Type II – Does not show significant elevation of the lateral end of the clavicle but is due to a tear of the AC ligament.
- Type III – Results from tears in the AC and CC ligament. Noted by > 5 mm elevation of the AC joint.
- Types IV – VI : are associated with complications of a Type III injury.