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 Discussion of Acromioclavicular separation
 Classification of Acromioclavicular separation
- Type 1: Radiographs appear normal but tenderness is present over the AC joint.
- Type 2: Complete tear of the acromioclavicular ligaments. The clavicle is superiorly displaced by less than half of its own width.
- Type 3: Complete tears of both the acromioclavicular and coracoclavicular ligaments. Displacement greater than half of the width of the clavicle is present.
- Type 4: Similar to type 3 except there is also posterior displacement of the distal clavicle.
- Type 5: Distal clavicle is displaced futher superiorly than in a type 3 separation. Distal clavicle penetrates muscle.
- Type 6: Inferior displacement of the clavicle.
 Imaging Findings for Acromioclavicular separation
- As above.
- Radiograph demonstrates a right type 3 acromioclavicular separation