<prompt> Jefferson fracture is:C2 fractureC1 fractureFracture of talusAtlanto- axial dislocation  <response>: Ans. B. C1 fracture Jeffersons fracture: Sudden severe load on the top of the head may cause a bursting force which fractures the ring of the atlas. There is no encroachment on the neural canal and, usually, no neurological damage. 