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The acromion and coracoid point anteriorly. This radiograph shows a posterior shoulder dislocation, an entity which is often difficult to pick up on an AP radiograph but can be easily noted in other views such as this axillary view.
Source
Image Source: http://rad.usuhs.edu/medpix/kiosk_image.html?mode=quiz&imid=17288&pt_id=6392&quiz=no&page=&th=&map=&skiprows=&this_week=&sth=-1#pic