The image shows an acute fracture at the base of the odontoid with evidence of posterior displacement of the fracture fragment. Such fractures are typically unstable.
In addition, there is evidence of a fracture and subluxation at the C4/C5 level. However, given the degree of sclerosis and chronic changes present, this finding is likely an old one.
The patient was maintained in a collar on bedrest. Subsequently, he underwent odontoid pinning to stabilize the fractures.