Acromioclavicular joint injury - type III
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Patient with a history of trauma. Presents pain on elevation and abduction of the shoulder
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Separation of the AC joint with superior displacement of the clavicle relative to the acromion. Disruption of the AC joint capsule and the AC ligaments. In addition, there is a total disruption of the CC ligaments.
The findings are consistent with a type III acromion-clavicular dislocation in the Rockwood classification, where the clavicle is elevated above the superior border of the acromion but the coracoclavicular distance is less than twice normal (i.e. <25 mm). Both the AC and CC ligaments present total disruption.
- Imaging of the Acromioclavicular Joint: Anatomy, Function, Pathologic Features, and Treatment