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  1. Melanie Stander,
  2. Jonathan Wyatt

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Posterior shoulder dislocation

Diagnosing posterior shoulder dislocation can be difficult. It is relatively rare and clinical and radiological signs can be subtle. A new sign, the ‘Mouzopoulos’ sign, which is seen in anteroposterior x-ray views of the shoulder is described. The name is taken from the capital letter ‘M’ of the Greek alphabet, which is the first letter of the author's name and is produced by the projections of greater and lesser tuberosity borders seen on the anteroposterior view of the humeral head. Anteroposterior x-ray views of 14 patients with posterior shoulder dislocation were evaluated for detecting possible radiographic signs of posterior shoulder dislocation such as light bulb sign, rim sign, trough line sign, absence of normal half-moon overlap and the ‘Mouzopoulos’ sign. At least two radiographic signs, usually the trough line sign and the ‘Mouzopoulos’ sign, were seen in all cases. This could be a useful radiographic feature to look for in patients with suspected posterior dislocations associated with limited external arm rotation (Emerg Radiol 2010;17:317–20).

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