Chest pain post motor vehicle accident.
This is a longitudinal view of the sternum.
There is a transverse fracture across the sternum with significant displacement. The cranial section is displaced posteriorly relative to the caudal segment.
With each respiration the two segments can be seen to move independently implying this fracture traverses both cortices.
Sternal fractures are not uncommon, and in themselves are relatively benign injuries. They may however be associated with more significant thoracic injuries and one should consider searching for these if there is a reasonable clinical suspicion.