Anterior subluxation of C5 on C6: hyperkyphotic
angulation at C5-C6 level. C5- C6 interspinous
space (white arrow) is abnormally wide
(""fanning " ), inferi or facets of C5 are anteriorly and
superiorl y displaced and their posterior margins are
no longer superimposed (arrows) as at other, uninvolved,
levels (arrowheads). Distance between posterior
cortex of body of C5 and anterior cortex of
pillars of C6 (open arrow) is abnorm ally wide and
fifth disc space is widened posteriorly and narrowed
anleriorly