Coccydynia (Tailbone Pain) Treatment & Ultrasound-Guided Injection

Coccygodynia, pain in and around the coccyx (tailbone), is one of those problems that sounds minor but can dominate your day, because it flares with the one thing we all do constantly: sitting. It may follow a fall, childbirth, prolonged sitting or repetitive microtrauma, or come on with no obvious cause. Reassuringly, most patients improve with conservative treatment; for those whose symptoms persist, a targeted, ultrasound-guided corticosteroid injection is a safe, minimally invasive option that can reduce pain, restore sitting tolerance, and often help you avoid surgery.

What is coccydynia?

Your coccyx is the small, triangular structure at the base of your spine, made up of a few little bones and joints. It provides attachment for ligaments and pelvic-floor muscles and helps distribute pressure when you sit. Coccydynia (or coccygodynia) simply means pain in and around it. The pain is usually well localised to the tailbone and is worse when sitting, especially on a hard surface or leaning slightly back, when driving, and when moving from sitting to standing. Some people also notice discomfort during bowel movements or intercourse.

Why does it happen?

Anything that irritates the coccyx, the small sacrococcygeal joint just above it, or the surrounding ligaments and pelvic-floor muscles can cause coccydynia. Common causes and risk factors:

• A fall or knock onto the tailbone, the classic trigger
• Childbirth, pressure and strain during delivery
• Prolonged or repetitive sitting pressure, long desk hours, cycling or rowing
• Being female, the shape and position of the pelvis makes it more common in women
• Body weight at either extreme, a higher BMI increases pressure on the coccyx; a very low BMI reduces its natural cushioning
• An abnormally mobile coccyx, reduced mobility, or a small bony spur (spicule), which can catch or irritate with sitting
• Degeneration of the sacrococcygeal or intercoccygeal joints, or irritation of the surrounding soft tissues
• Pelvic-floor muscle dysfunction

Often there's a clear trigger; sometimes it simply comes on with no obvious cause. Infection, inflammatory disease and tumours are uncommon causes, but I always keep them in mind when the presentation is atypical.

How do I know it's my coccyx?

• Localised pain right at the tailbone
• Worse sitting, particularly on hard surfaces or leaning back, and often relieved by standing or leaning forward
• A sharp catch of pain as you rise from sitting to standing
• Tenderness when the area is touched
• Difficulty driving or working at a desk
• Sometimes discomfort with bowel movements or intercourse

What you don't usually get is pain, numbness or weakness running down the leg, if you do, or if the pain sits higher in the lower back or mostly to one side, that points to a different source (such as the lumbar spine or sacroiliac joint) and needs assessing on its own. A careful clinical assessment is essential before anyone recommends an injection.

How I assess & diagnose it

Coccydynia is primarily a clinical diagnosis, based on your history and examination. The key question I'm answering is simple: does direct pressure over the coccyx reliably reproduce your familiar pain? Every patient undergoes a comprehensive assessment before any treatment, which includes:

• A detailed history
• Examination of coccygeal mobility and tenderness
• Ultrasound assessment of the sacrococcygeal region
• Consideration of alternative sources, the lumbar spine, sacroiliac joints, pelvic floor and surrounding soft tissues
• Review of any previous imaging

Imaging isn't needed in every case, but it can be valuable when symptoms are persistent, severe, follow significant trauma, or don't add up.

What imaging can add

• Standard and dynamic X-rays. Plain radiographs may show a fracture, abnormal curvature, dislocation, degeneration or a spicule. Dynamic sitting and standing X-rays show how the coccyx moves under load, particularly useful when hypermobility, instability or abnormal fixed positioning is suspected.
• MRI. Appropriate when there is persistent pain without a clear mechanical explanation, or concern about bone-marrow or soft-tissue abnormality, inflammation, previous major trauma, infection or a mass.
• Ultrasound. Shows the superficial bony contour and some surrounding soft-tissue problems, and, importantly, provides real-time guidance during an injection. It does not replace dynamic X-rays for instability or MRI for deeper pathology.

If the coccyx is confirmed as the source of your pain, an ultrasound-guided corticosteroid injection can often provide meaningful relief while avoiding more invasive procedures.

Treatment: a stepwise, evidence-based approach

Current research supports a progressive approach, beginning with the least invasive options and escalating only if simpler measures don't settle things. A systematic review of 64 studies and 1,980 patients confirmed that most patients improve with non-surgical management, though it also highlighted how variable the underlying studies are (Andersen et al., 2022).

1. Activity modification and ergonomic advice
2. Coccygeal (wedge or U-shaped) cushions
3. Anti-inflammatory medication where appropriate
4. Physiotherapy and pelvic-floor rehabilitation if indicated
5. Ultrasound-guided corticosteroid injection
6. Ganglion impar block or radiofrequency for selected chronic cases
7. Coccygectomy (surgical removal of the coccyx) for carefully selected patients with persistent, disabling pain

Most patients improve without surgery, only a small proportion ever need an operation. A good first move is to offload the tailbone: a wedge-shaped cushion with a posterior cut-out is often more comfortable than a circular ring cushion, though individual preference varies.

Can physiotherapy help?

Physiotherapy is particularly worthwhile when symptoms are driven by pelvic-floor overactivity, guarding around the coccyx, poor sitting posture, reduced hip or lumbar movement, or altered movement patterns after an injury. Treatment is tailored to the individual and may include postural advice, pelvic-floor relaxation, mobility work, manual therapy and graded return to sitting. A 2025 systematic review found physiotherapy interventions, extracorporeal shockwave therapy in particular, showed promising results, while noting wide variation between protocols and limited long-term follow-up (Blanco-Díaz et al., 2025; Mazzoleni et al., 2025).

Does a corticosteroid injection work?

Corticosteroid injections come into play when conservative treatment hasn't given enough relief and the pain remains clearly localised to the coccyx. A corticosteroid is combined with local anaesthetic and placed around the painful sacrococcygeal or intercoccygeal level; the local anaesthetic can give early, temporary relief, while the steroid works to reduce inflammation and pain over the following days to weeks. The best outcomes are seen when:

• Pain is clearly localised to the coccyx
• Sitting reliably reproduces your symptoms
• Conservative treatment has failed
• Symptoms have been present for less than 12 months

The largest modern study, 241 patients (Finsen et al., 2020), described the overall effect as moderate but clinically meaningful, with uncommon complications, and concluded that injection remains worthwhile because it's straightforward and low-risk. Outcomes were more favourable when symptoms had been present for under 12 months, and triamcinolone appeared more effective than betamethasone in that cohort. I'm always honest about this: an injection is not a guaranteed cure. Some patients get substantial, lasting relief; others get partial, temporary or no meaningful benefit, and a repeat injection may help selected individuals.

The procedure: ultrasound-guided sacrococcygeal injection

The injection places a corticosteroid together with local anaesthetic into and around the sacrococcygeal joint to reduce inflammation and calm the pain. You lie comfortably face down; I scan the region, numb the skin with local anaesthetic, and then, under continuous ultrasound guidance, place the medication precisely. The whole procedure takes about 15–20 minutes. Done with adequate local anaesthetic it isn't painful; you'll usually feel pressure as the medication goes in. Risks are those of any ultrasound-guided steroid injection: some local soreness for a day or two, minor bruising and, rarely, infection. If you're diabetic: the steroid can raise blood sugar for a week or two; I won't inject if your HbA1c is above 8.5 (type 1 or insulin-treated).

Why ultrasound guidance?

All coccyx injections at Insight MSK are performed under real-time ultrasound wherever anatomy allows. A small randomised trial (30 patients) comparing ultrasound-guided with palpation-guided injection found both improved pain and function, without a statistically significant difference between them (Ahadi et al., 2022). That study wasn't large enough to detect small differences in accuracy or uncommon complications, so it doesn't show that guidance has no value. Ultrasound offers clear practical advantages:

• Accurate visualisation of the coccyx and the relevant joint level
• Direct sight of the needle throughout the procedure
• No radiation exposure
• Identification of bursitis or soft-tissue abnormalities
• Confirmation that the medication reaches the intended target

For these reasons, ultrasound guidance is my preferred technique.

What happens after the injection?

The local anaesthetic may ease your pain for a few hours; it can then return as the anaesthetic wears off, and some people notice a short-lived post-injection flare before the steroid takes effect. Improvement usually builds gradually over several days. I'll advise you to avoid strenuous activity briefly, then return progressively to normal sitting, exercise and rehabilitation. The goal isn't just less pain, it's the window it opens to restore normal movement and sitting tolerance.

If the injection doesn't work: the ganglion impar block

Not all coccydynia comes from inflammation within the coccygeal joints. Some persistent pain arises from the ganglion impar, a small sympathetic nerve structure sitting just in front of the lower sacrum and coccyx, which relays pain from the coccygeal, perineal and pelvic region. A ganglion impar block is different from a local joint injection: rather than targeting a painful joint or ligament, it aims to interrupt pain transmission through this nerve.

I'd consider it when pain is chronic or refractory, when a local coccygeal injection hasn't given enough relief, when symptoms have a burning or neuropathic quality, or when the pain isn't clearly confined to one superficial level. The evidence is encouraging: a randomised double-blind study found that adding corticosteroid to the block produced a more sustained response than local anaesthetic alone (Sencan et al., 2019); a further randomised study found a ganglion impar block gave greater early improvement than caudal epidural steroid injection (Sencan et al., 2022); and a recent systematic review concluded that non-neurodestructive ganglion impar blocks appear potentially effective and reasonably safe for chronic refractory coccydynia, while stressing the limitations of the current studies (Jevotovsky et al., 2026). Where symptoms persist, I work closely with pain specialists and spinal surgeons to make sure you get the most appropriate next step.

Radiofrequency treatment

Radiofrequency uses thermal or electrical energy to modify pain transmission through a targeted nerve. A pain specialist may consider it when a diagnostic or therapeutic nerve block has produced clear but temporary relief. A 2024 study comparing ultrasound-guided coccygeal nerve radiofrequency with corticosteroid injection found both improved over 12 weeks, with fewer adverse events in the radiofrequency group, though larger, longer trials are needed before firm conclusions can be drawn (Can et al., 2024). Radiofrequency is therefore a reasonable option for selected refractory cases, not a routine first-line treatment.

When is surgery recommended?

Coccygectomy, surgical removal of part or all of the coccyx, is the last-line treatment for chronic coccydynia. It's generally reserved for patients who:

• Have had disabling pain for many months
• Have failed comprehensive non-operative and appropriate interventional treatment
• Have pain clearly reproduced by palpation of the coccyx
• Have imaging findings consistent with coccygeal instability, subluxation or a painful spicule
• Have responded, even temporarily, to a diagnostic injection, confirming the coccyx as the pain generator

Coccygectomy is the most extensively studied treatment for refractory coccydynia. A 2022 systematic review and meta-analysis found clinically meaningful improvements in pain and disability after surgery, while confirming the importance of surgical complications, particularly wound problems and infection (Sagoo et al., 2022). A large single-centre series of 173 patients reported significant long-term improvement, with wound infection in about 9% (Mulpuri et al., 2022). Surgery can produce substantial, durable improvement in carefully selected patients, but it should never be described as an uncomplicated or guaranteed cure, and it's only considered once appropriate conservative and interventional treatments have been exhausted.

Can an injection predict whether surgery will help?

A meaningful but temporary response to a precisely targeted local anaesthetic and corticosteroid injection supports the conclusion that the coccyx is the principal source of pain. It doesn't guarantee surgical success, but, alongside the examination and imaging, it's useful information when weighing up a surgical referral. Conversely, a complete lack of response should prompt a rethink: was the right structure targeted, is the pain truly coccygeal, and are pelvic-floor, spinal or neuropathic factors contributing?

When do I recommend an injection, and when not?

I generally recommend an ultrasound-guided corticosteroid injection when:

• Symptoms have persisted despite appropriate conservative management (usually 6–12 weeks)
• Your familiar pain is clearly reproduced by palpating a specific coccygeal level
• Sitting and moving from sitting to standing reproduce your symptoms
• The presentation fits local mechanical or inflammatory coccygeal pain
• Relevant imaging has been reviewed or arranged where clinically necessary
• There are no red flags or contraindications such as infection, fracture or tumour

Patients with symptoms of less than a year appear more likely to respond, but duration is only one factor, someone with longer-standing yet precisely localised pain can still do well. I'd be cautious about injecting when the pain can't be reproduced over the coccyx, when it seems to come from the lumbar spine or sacroiliac joint, when it's widespread rather than focal, when there are unexplained systemic symptoms, or when previous accurately targeted injections gave no benefit and the diagnosis remains uncertain. An injection works best when the assessment identifies a specific, credible pain generator, not simply because pain is somewhere near the lower spine.

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