Problem Chronic disabling pain in the sacrococcygeal region is regarded by clinicians with great dismay because of unpredictability of the treatment outcome. The subject is under- represented in the literature.

Method Thirty eight patients with intractable coccydynia had imaging investigations for the spine other than X-rays. Six of these patients were also investigated by means of sacrococcygeal and intercoccygeal discography. The excised specimen with intact sacrococcygeral joint was sent for histological examination in 22 patients. Patients’ assessment of the benefit of coccygectomy was conducted by telephonic interview.

Results After a mean post surgical follow up of 6.75 years (range 2–16 yrs), results were available for 31 out of 38 patients.

16 patients benefited greatly from the surgery and 6 benefited to some extent, giving an overall good result of 71%. 7 patients had no or little relief from surgery (29%).

Moderate to severe degenerate changes in SC and IC joints on histology were found in 59% of patients. 91.6 % of these patients did well with surgery. Only 60 % of those with mild changes did well.

Discography was possible in five out of six attempted cases. Two were positive and both did well from surgery. Three patients had negative discographies and two of them had a poor result and one had only some relief.

Conclusions Degenerate changes in sacrococcygeal discs give rise to pain. Surgical results are better in those with a severe degree of degenerative change. It is possible to identify these with discography, though a larger study needs to be carried out.