Hypermobility of the coccyx -2 Jean-Yves Maigne, MD

Mise en ligne : Novembre 2003 Dernière modification : 09.04.04

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Here are seven other cases of hypermobility. You will learn about another radiologic sign: the disalignment of the coccygeal vertebrae (also called "bones") in the sitting position, which is an accompanying sign of hypermobility in flexion, and you will see two examples of a frequent difficulty in reading the radiographs, when the distal part of the coccyx is involved.

Case #7. Hypermobility can also be accompanied by another interesting sign: a disalignment of the two involved bones (a step in their anterior aspect) which is obvious in this case, where the two other radiologic signs are present : hypermobility (40°) and bony contact with friction.

Case #8. The mobility is between 25° and 30°, but there is a friction of the bones and a disalignment in flexion, which I consider abdnormal (despite very slight here). Naturally, the interspace was tender at palpation.

Case #9. Another example of disalignment in flexion (X).

Case #10. A misleading aspect. The distal bone, not clearly visible on the sitting film here, has pivoted of 50° in flexion. The patient felt her pain at the tip of the coccyx, a vey good clinical indicator.

Case #11. Another case with hypermobility and friction (note on the sitting film how the opposite surfaces are congruent) but without misalignment.

Case #12. this caes is similar to case #9, the distal part of the coccyx being difficult to evidence on the film.

Case #13. A strange aspect. There is clearly an hypermobility, but the coccyx seems to be in a permanent state of anterior luxation.

Case #14. This is a "sitting film" with a marked misalignment and an irregularity of the endplate, with a step, maybe corresponding to the sacral apex.

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