acromioclavicular joint injury(redirected from acromioclavicular joint dislocation)
acromioclavicular joint injuryA disruption of the articulation formed between the acromion process and the clavicle, which may be accompanied by tearing of ligaments.
Football, wrestling, equestrianism, hockey.
Pain at the top of the shoulder, decreased range of movement, splinting with arm held to the side; severe injury may be accompanied by a “lump” on the top of the shoulder.
Grade I—partial tear of the acromioclavicular ligament.
Grade II—complete tear of the acromioclavicular ligament and partial tear of the coracoclavicular ligament, accompanied by subluxation or partial displacement.
Grade III—complete disruption of the joint.
Ice may alleviate pain and inflammation; grades I and II: use of a sling for pain; grade III may require open reduction and internal fixation, though there may be some disinclination to perform this manouevre for a non-break.
Direct downward blow to the tip of the shoulder.