A posterior dislocation should be considered as a differential in any episode of shoulder pain and immobility after a seizure. Incidence. The shoulder joint is the most commonly dislocated joint presenting to hospital. Posterior dislocations account for 2-4% of all shoulder dislocations.
The ideal image for identifying a posterior dislocation is a axillary film, with the patients arm abducted at 70-90 degrees and the image taken from an angle of 45 degrees through the axilla. This should be done as part of a standard set of imaging after shoulder injury, along with an AP and lateral view of the shoulder.
Posterior shoulder dislocation. Posterior shoulder dislocations are far less common than anterior shoulder dislocations and can be difficult to identify if only AP projections are obtained. A high index of suspicion is helpful.
Posterior Shoulder Dislocation1 Image Diagram - Chart - diagrams and charts with labels. This diagram depicts Posterior Shoulder Dislocation1 Image