Acromioclavicular joint dissociation - type IV

Case contributed by Assoc Prof Craig Hacking


Painful left shoulder after sports tackle.

Patient Data

Age: 25 years
Gender: Male

Glenohumeral joint is normally aligned. Posterior superior dislocation of the clavicle at the acromioclavicular joint. No fracture identified.

The distal clavicle is displaced posteriorly with respect to the acromion, protruding into the trapezius muscle. The glenohumeral joint is normally aligned. No shoulder or rib fractures.

Case Discussion

Posterior dislocation of the distal clavicle with respect to the acromion, with the clavicle protruding into the trapezius muscle is a type IV ACJ injury.

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