Coccydynia related to calcium crystal deposition

Spine (Phila Pa 1976). 2008 Aug 1;33(17):E620-3. doi: 10.1097/BRS.0b013e31817c6cd2.


Study design: Study of 4 cases of severe coccydynia revealing calcium deposits in the sacrococcygeal and intercoccygeal joints.

Objective: To highlight calcium crystal deposition as a cause of sudden-onset coccydynia.

Summary of background data: Intervertebral disc calcification in the cervical, thoracic, or lumbar spine is well known, but calcifications in the sacrococcygeal or intercoccygeal joints with symptoms have never been reported.

Methods: All 4 patients presented with severe, sudden-onset coccydynia. Radiographs of the coccygeal area showed calcific deposits in the sacrococcygeal or intercoccygeal joints. Patients received a short course of oral corticosteroids or steroid injections.

Results: Conservative management provided prompt relief in all but one case. In 2, the resolution of the calcific deposits as seen on follow-up radiography was highly suggestive of their apatite origin.

Conclusion: Calcium crystal deposition in the sacrococcygeal or intercoccygeal joints can cause coccydynia. Conservative treatment is effective as a first-line approach.

Publication types

  • Case Reports

MeSH terms

  • Adrenal Cortex Hormones / therapeutic use
  • Adult
  • Calcinosis / diagnosis
  • Calcinosis / diagnostic imaging*
  • Calcinosis / drug therapy
  • Calcium
  • Coccyx / diagnostic imaging*
  • Crystallization
  • Female
  • Humans
  • Middle Aged
  • Radiography
  • Spinal Diseases / diagnosis
  • Spinal Diseases / diagnostic imaging*
  • Spinal Diseases / drug therapy


  • Adrenal Cortex Hormones
  • Calcium