Title: Posterior Shoulder Dislocations<br/>Author: Brian Corwell<br/><a href='http://umem.org/profiles/faculty/294/'>[Click to email author]</a><hr/><p>
<span style="font-size: 9pt; font-family: Arial, sans-serif;">Posterior Shoulder Dislocations are uncommon (strong supporting structures vs. anterior)<o:p></o:p></span></p>
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<span style="font-size: 9pt; font-family: Arial, sans-serif;">But commonly missed by physicians<o:p></o:p></span></p>
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<span style="font-size: 9pt; font-family: Arial, sans-serif;">Mechanism: Direct blow anterior shoulder/FOOSH with shoulder internally rotated and ADDucted)<o:p></o:p></span></p>
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<span style="font-size: 9pt; font-family: Arial, sans-serif;">May also see with seizure/electric shock (tetanic contraction)<o:p></o:p></span></p>
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<span style="font-size: 9pt; font-family: Arial, sans-serif;">Clinical findings subtle<o:p></o:p></span></p>
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<span style="font-size: 9pt; font-family: Arial, sans-serif;">Shoulder held in ADDuction and internal rotation. Patient unable to externally rotate arm from this position. If habitus allows, anterior shoulder depression/posterior fullness. <o:p></o:p></span></p>
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<span style="font-size: 9pt; font-family: Arial, sans-serif;">Radiology: Decreased overlap between humeral head and glenoid fossa. Proximal humerus fixed in internal rotation looks like a light bulb on a stick.<o:p></o:p></span></p>
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<span style="font-size: 9pt; font-family: Arial, sans-serif;">Y view will show subtle posterior displacement of humeral head (not as dramatic as is in anterior dislocations!)</span></p>
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<span style="font-size: 9pt; font-family: Arial, sans-serif;"><o:p></o:p></span></p>
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http://cdn.lifeinthefastlane.com/wp-content/uploads/2009/06/posterior_shoulder_dislocation_005.jpg</p>
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http://eorif.com/Shoulderarm/Images/Shoulder-dislocationP1.jpg</p>
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