A block of the small nerve bundle at the very base of the spine, for tailbone and pelvic pain.
What it is
The ganglion impar sits in front of the coccyx (tailbone). It carries sympathetic signals, the automatic nerve signals, from the pelvic floor and tailbone area. Blocking it is often the treatment that finally works for stubborn coccydynia (tailbone pain).
What we use it for
- Coccydynia that has not settled with conservative care (rest, cushions, therapy)
- Chronic pelvic and perineal pain
- Tailbone pain from injury after a fall
What to expect
- Under fluoroscopy, about 15 minutes.
- Positioning is face down.
- No sedation; most patients drive themselves home.
Risks
The needle path passes close to the rectum. So careful technique and a germ-free field matter most, and a bowel preparation may be requested. Brief soreness at the injection site is usual. Rare risks include infection and, very rarely, injury to nearby structures. Both are kept low by fluoroscopic guidance (live X-ray) and contrast confirmation before injection.
Call us or request an appointment.
How we judge whether it worked
We judge it by how long you can sit, not by a pain score, because sitting is what coccydynia takes away.
It is an uncommon procedure. That is exactly why lasting tailbone pain goes untreated for so long. When cushions and time have failed, this is often what finally works.
Before and after your procedure
No sedation is used, so most patients drive themselves home. Normal activity, including work, resumes within two to four hours. A bowel preparation may be requested beforehand. We will tell you in advance. Expect soreness at the injection site for a day or two. Use a wedge cushion for sitting in the first week. Report fever or any discharge right away.
How the procedure is actually done
The ganglion impar is one small nerve bundle at the very base of the spine. It sits in front of the sacrococcygeal junction, where the tailbone meets the sacrum. That is where the two sympathetic nerve chains meet and end. It is reached under fluoroscopic guidance with a fine needle. Contrast confirms the position before anything is injected. The procedure is brief. The target is a sympathetic nerve, not a nerve that moves muscle, so there is no effect on leg strength.
Who it suits, and who it does not
It is used for pain in the tailbone, perineum (the area between the legs) and lower pelvis. That includes coccydynia that has not settled, perineal pain after surgery or radiation, and some sympathetically maintained pain (pain driven by the sympathetic nerves) in that area. It is not the answer for mechanical tailbone pain from a coccyx that moves too much or is broken. That is assessed differently. It is not used where there is infection in the area.
How this fits the wider plan
A procedure is one part of the treatment, not the whole thing. When it opens a window of relief, we use that window. We use it for therapy, for rebuilding strength, and for correcting the loading or the metabolic factors that played a part. Relief that is not used tends not to last. A patient who comes back in three months unchanged has usually had the procedure without the rest of the plan around it.
Common questions
Is this used often?
It is uncommon, which is part of why lasting tailbone pain goes untreated for so long. It is well established and works in the right patient.
Where exactly is the injection given?
At the base of the spine, just in front of the joint between the sacrum and the tailbone. The position is checked with contrast under fluoroscopy before any medicine is given.
Is it embarrassing?
It is a brief procedure done with the same draping and privacy as any other. Staff do these all the time. Patients are usually more worried before than after.
How long does relief last?
It varies. A diagnostic block is expected to be short-lived. If it confirms the source, we can talk about longer-lasting options.
Sources
- Malik SH et al. Ganglion Impar Block For Chronic Coccydynia. Journal of Ayub Medical College, Abbottabad : JAMC, 2023. PubMed 36849391
- Gonnade N et al. Ganglion impar block in patients with chronic coccydynia. The Indian journal of radiology & imaging, 2017. PubMed 29089683
- Swain BP et al. Ganglion Impar Block: A Magic Bullet to Fix Idiopathic Coccygodynia. Cureus, 2023. PubMed 36819309
- Daily D et al. Coccydynia: A Review of Anatomy, Causes, Diagnosis, and Treatment. JBJS reviews, 2024. PubMed 38709859
Hurt in an accident? Start here.
You do not need a lawyer, a police report or a referral to be seen. Bring your symptoms and we will work out the rest.
Monday–Friday, 8:00 a.m. – 4:00 p.m. Same-day appointments are often available for new accident and injury patients.