The lateral margins of the lateral masses (inferior
articular facets of C1) should align with the lateral
margins of the structures below it (superior articular
facets of C2). The space between these two facets is
the atlanto-axial joint. In this radiograph, the lateral
masses of C1 are displaced outward, indicating a
"bursting" of the ring of C1 (the Jefferson Fracture).
articular facets of C1) should align with the lateral
margins of the structures below it (superior articular
facets of C2). The space between these two facets is
the atlanto-axial joint. In this radiograph, the lateral
masses of C1 are displaced outward, indicating a
"bursting" of the ring of C1 (the Jefferson Fracture).
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