Direct trauma to lateral shoulder/clavicle or fall on outstretched arm
Swelling, deformity, and tenderness overlying the<unk> 
Affected arm may be supported by the contralateral arm
Rare, but important to evaluate for
Type I (middle)
Subclavian artery/vein injury
Nerve root and/or brachial plexus injury
Type II (lateral)
Coracoclavicular ligament injury
AC joint dislocation/subluxation
Type III (medial)
Intrathoracic injury
Rib fracutre
Sternal fracture
Subclavian artery/vein injury
Nerve root and/or brachial plexus injury
Coracoclavicular ligament injury
AC joint dislocation/subluxation
Intrathoracic injury
Rib fracutre
Sternal fracture
Clavicle fracture
Airway/Pulmonary
Navicular fracture
Bronchial injury
Jefferson fracture
Diaphragmatic trauma
Greenstick fracture
Hemothorax