Acromioclavicular joint injury: grade IV
Pain in the right shoulder after fall down.
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Disruption of the AC joint and clavicle displaced posterior into the trapezius
AC ligament: ruptured
CC ligament: ruptured
Joint capsule: ruptured
Deltoid muscle: minimally detached
Trapezius muscle: detached
Coracoclavicular distance:26 mm.
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.