From the case:
Intercoccygeal angle (illustration)
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Illustration depicting measurement of the intercoccygeal angle as described by Kim and Suk 1.
On a midline sagittal image, a straight line is drawn bisecting the first coccygeal segment parallel to its long axis. The intercoccygeal angle is formed at the intersection between this line and a similar straight line drawn bisecting the last coccygeal segment 1.
Case Discussion
For more information, see the related article on intercoccygeal angle.