Which anteroposterior (AP) view radiographic findings are characteristic of coccyx pain?

Updated: Jan 07, 2021
  • Author: Patrick M Foye, MD; Chief Editor: Consuelo T Lorenzo, MD  more...
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In the anteroposterior (AP) view, the first (most superior) coccygeal vertebra can be distinguished from the other coccygeal vertebrae by the presence of the bilateral coccygeal cornu posteriorly and the bilateral transverse processes laterally. (The transverse processes of the first coccygeal segment are much wider and much more prominent than are the transverse processes of the inferior coccygeal vertebrae.)

The apex of the coccyx is usually rounded, but a bifid appearance can sometimes be appreciated in the AP radiographic view. The apex is typically midline but may deviate laterally.

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