Can You Break a Bone in Your Buttocks?

You absolutely can break a bone in your buttocks, and it happens more often than most people realize. The buttock region sits over several bones that are all vulnerable to fracture: the coccyx (tailbone), the ischial tuberosities (the bony points you sit on), and the sacrum (the broad, triangular bone at the base of your spine). A hard fall onto your backside, a high-energy collision, or even the everyday stress of weakened bones can crack any of them. What makes these injuries tricky is that they are frequently misdiagnosed or missed entirely, because the pain they produce often mimics more familiar problems like a pulled muscle, sciatica, or a slipped disc.

The Bones Underneath Your Buttocks

People tend to think of the buttocks as a thick cushion of muscle and fat with no bones near the surface. There is muscle and fat there, but the padding is not as generous as you might expect. Research measuring the tissue between the skin and the underlying bone found that total soft-tissue thickness ranged from roughly 5.6 to 32 millimeters, and most of that was adipose (fatty) tissue rather than muscle. More surprisingly, the majority of people studied had little to no gluteus muscle coverage directly over their ischial tuberosities, the two bony knobs at the bottom of each side of the pelvis.¹ In plain terms, when you sit down, your body weight presses almost directly on bone with relatively thin padding in between.

Biomechanical modeling has confirmed what that anatomy suggests: the highest mechanical stress when you are seated concentrates at the interface between muscle and bone, not at the skin surface.² That means a sudden impact or even sustained pressure loads energy straight into the skeleton. Three bones bear the brunt: the coccyx at the midline, the paired ischial tuberosities on either side, and the sacrum just above.

Coccyx Fractures

The coccyx, or tailbone, is the most commonly broken bone in the buttock area. It is a small, curved chain of fused or semi-fused vertebrae at the very bottom of the spine, and it sits just under the skin with minimal padding. A direct fall onto a hard surface, like slipping on ice and landing squarely on your backside, is the classic mechanism. Childbirth can also fracture or dislocate it. The pain, called coccydynia, tends to be sharp when you sit down, shift your weight, or stand up from a seated position, and it can persist for weeks or months.

One of the frustrating features of coccyx fractures is that they do not always show up on standard X-rays. A case report documented a patient whose coccyx fracture was missed on initial imaging because the broken fragment sat in line with the rest of the bone, making it invisible on a plain film. It was only when doctors ordered an MRI, prompted by continuing symptoms, that the fracture and a loose bone fragment were confirmed; the diagnosis was later verified during surgery.³ If you have pain at the tailbone after a fall and the first X-ray comes back “normal,” that does not necessarily mean nothing is broken. Lateral (side-view) X-rays taken while sitting and standing are the best first step, but when clinical suspicion remains high, advanced imaging is warranted.

Most coccyx fractures are managed conservatively. Treatment typically involves rest, pain medication, physical therapy, and sometimes a donut-shaped or wedge-shaped cushion that takes pressure off the tailbone while sitting.⁴ Surgery is rare and generally reserved for cases like the one described above, where a fragment fails to heal and continues causing pain. Recovery can be slow; sitting comfortably again may take several weeks to a few months, and some people deal with intermittent soreness for longer.

Ischial Tuberosity Fractures

Your ischial tuberosities are the two bony prominences at the base of each half of the pelvis. They are the bones you are actually sitting on right now. The hamstring muscles attach directly to them, and that attachment point is where trouble can start. In adolescents and young athletes, the growth plate at the ischial tuberosity has not yet fully fused, making it a weak link. A sudden, forceful contraction of the hamstrings, like an explosive kick in soccer or a high split in dance, can rip a piece of bone away from the tuberosity. This is called an avulsion fracture, and it is the most common type of ischial tuberosity fracture.⁵

Adults with fully fused bones are not immune, though. A direct blow to the buttock can fracture the ischium outright. One published case described a 36-year-old man who fell from a dirt bike and landed on his right buttock, resulting in a displaced fracture of the ischial body.⁶ That report compared the injury pattern to a “nightstick fracture” of the forearm, where a direct strike to an exposed bone causes an isolated break. It is uncommon but not exotic; any high-energy impact to the seat area can do it.

Ischial tuberosity fractures hurt most when you sit, run, or stretch the hamstrings. In adolescents with avulsion injuries, treatment often involves rest, activity modification, and a gradual return to sport over several weeks. Displaced fractures in adults sometimes need surgical fixation, especially if the fragment has shifted significantly.

Sacral Fractures

The sacrum is the wide, shield-shaped bone that connects the spine to the pelvis. It sits between the two halves of the pelvis and forms the back wall of the pelvic ring. Sacral fractures come in two flavors, and the distinction matters a great deal.

High-energy sacral fractures happen in car crashes, falls from height, or other major trauma. These are typically obvious because the forces involved cause severe pain, and imaging is usually done right away as part of trauma evaluation. Unstable pelvic ring fractures involving the sacrum can require surgical stabilization with screws or plates.⁷

The more insidious type is the sacral insufficiency fracture, which develops in older adults whose bones have been weakened by osteoporosis. These fractures can occur without any major injury at all, sometimes after something as minor as stepping off a curb or sitting down hard.⁸ They are notoriously underdiagnosed because the symptoms, usually a vague, aching pain in the low back or buttocks that worsens with activity, closely mimic lumbar spinal stenosis or even metastatic cancer. Standard X-rays of the lumbar spine may look normal, and the sacrum itself is not always scrutinized.⁹ CT or MRI is generally needed to make the diagnosis.

If you are over 60, have osteoporosis, and have developed new low back or buttock pain without a clear cause, a sacral insufficiency fracture is worth considering. These fractures usually heal with conservative management, pain control, and gradual mobilization, but identifying them matters because untreated fractures can progress, and the pain can become debilitating.

Iliac Wing and Broader Pelvic Ring Injuries

The iliac wings are the broad, flared portions of the pelvis that you can feel at your hips. They extend around to the back and partly define the upper boundary of the buttock. Isolated iliac wing fractures are almost always the result of high-energy trauma such as motor vehicle collisions, and they tend to come with other serious injuries.¹⁰ These fractures are less about “buttock pain” and more about major trauma management, but they can certainly produce pain felt deep in the buttock, especially posteriorly.

In broader pelvic ring disruptions, which involve fractures at multiple points in the ring formed by the sacrum and the two halves of the pelvis, buttock pain is often one of many symptoms. Nerve injury is a real concern in these cases. Hip and pelvic fractures can damage the sciatic nerve, the large nerve that runs through the buttock and down the back of the leg. When this happens, the outcome for nerve recovery is often poor.¹¹ Another rare but serious complication is gluteal compartment syndrome, where bleeding inside the tight fascial compartments of the buttock builds pressure that can compromise blood flow. This has been reported even from a simple hip dislocation without a fracture, making it a potential emergency in any severe buttock injury.¹²

When Buttock Pain Is Not a Fracture

Fractures are far from the only cause of significant buttock pain, and the overlap in symptoms is why these injuries get missed so often. Several conditions produce pain in the same region and sometimes coexist with undiagnosed fractures.

Deep gluteal syndrome is a term for buttock pain caused by entrapment of the sciatic nerve somewhere in the gluteal space, outside the spine and pelvis. The nerve can be pinched by muscles (the piriformis is the most famous offender, but it is not the only one), scar tissue, or fibrous bands. A thorough physical exam can often pinpoint where the nerve is being compressed, and imaging can support the diagnosis.¹³ This condition is treated very differently from a fracture, so getting the diagnosis right matters.

Ischiogluteal bursitis, inflammation of the bursa (a fluid-filled sac) over the ischial tuberosity, is another common mimic. It causes pain right at the sit bone that worsens with prolonged sitting, closely resembling an ischial tuberosity fracture. Hamstring tendinopathy, sacroiliac joint dysfunction, and referred pain from the lumbar spine round out the list of usual suspects. A clinician sorting through these possibilities will typically rely on the mechanism of injury (was there a fall or a sudden forceful movement?), the exact location of tenderness, and imaging when the picture is unclear.

Why These Fractures Are Missed

A recurring theme across all of these injuries is delayed or missed diagnosis. There are a few reasons this happens so consistently. First, the buttock area is deep and difficult to examine thoroughly. Tenderness can be hard to localize when the patient is in pain from multiple sources. Second, plain X-rays of the pelvis are not great at showing fractures of the coccyx or sacrum. The coccyx is small and curved, and the sacrum is overlaid by bowel gas and other structures that obscure fracture lines. Third, many of these fractures produce symptoms that overlap with far more common problems like lumbar disc disease, muscular strains, or hip arthritis. Clinicians may understandably pursue those diagnoses first, and if the patient improves somewhat with rest and anti-inflammatory medication, the fracture may never be identified.

Sacral insufficiency fractures in older adults are the most commonly missed of all. As noted earlier, they occur without significant trauma and produce vague symptoms. Studies have described them as “easily neglected” and “usually overlooked.”⁹ If you or someone you know is an older adult with persistent low-back or buttock pain that is not responding to treatment for a presumed lumbar problem, asking specifically about a sacral fracture and requesting appropriate imaging is reasonable.

Recovery and Practical Advice

Recovery timelines vary quite a bit depending on which bone is broken and how severely. Coccyx fractures typically take four to eight weeks for pain to substantially improve, though some residual discomfort can linger for months. Ischial avulsion fractures in young athletes often heal in six to eight weeks with rest. Sacral insufficiency fractures generally improve over a similar period with activity modification and pain management, though full comfort can take longer in people with osteoporosis. Surgically stabilized pelvic fractures have longer rehabilitation courses, often several months before full weight-bearing and normal activity.

For anyone dealing with a buttock-region fracture, a few practical measures can make a significant difference in day-to-day comfort:

• Cushion choice: A wedge-shaped or coccyx cutout cushion redistributes pressure away from the tailbone and sit bones. Research on wheelchair cushion design has shown that off-loading designs can substantially reduce peak pressure under the ischial tuberosities and sacrococcygeal region compared to standard cushions.¹⁴ The same principle applies to anyone sitting on a fractured bone: getting the right cushion reduces contact stress where it hurts most.
• Sitting strategy: Lean forward slightly when sitting, or alternate between sitting and standing frequently. Avoid hard, flat surfaces entirely during the acute phase.
• Ice and warmth: Ice packs in the first 48 to 72 hours can reduce swelling. After that, gentle warmth or warm sitz baths may be more soothing.
• Stool softeners: This is the advice nobody thinks to mention. Straining during bowel movements puts direct pressure on the coccyx and sacrum and can be genuinely painful with a fracture in the area. A stool softener for the first few weeks is a small intervention with outsized comfort benefits.

Who Is Most at Risk

Certain groups face a higher-than-average chance of breaking a bone in the buttock region. Older adults with osteoporosis are vulnerable to sacral insufficiency fractures from trivial falls or even normal daily activity. Postmenopausal women are at particularly elevated risk because of accelerated bone loss after estrogen levels drop. People who take long-term corticosteroids or who have undergone pelvic radiation therapy also have weakened bone in this area.

At the other end of the age spectrum, adolescent athletes in sports that demand explosive kicking, sprinting, or flexibility are prone to ischial avulsion fractures because of their unfused growth plates.⁵ Soccer players, dancers, and hurdlers show up repeatedly in case series. Anyone engaged in high-speed or high-impact activities, from motorcycling to horseback riding, faces direct-impact fracture risk.

People who spend extended hours in a wheelchair or who have impaired sensation in the buttock area, such as those with spinal cord injuries, deal with a different but related concern. Prolonged pressure on bony prominences that are already minimally padded can lead to stress injuries and pressure-related bone changes over time, on top of the more commonly discussed risk of pressure ulcers.

When to Seek Medical Attention

Not every hard landing on your backside warrants a trip to the emergency department. Bruising and soft-tissue soreness from a fall usually resolve within a week or two. But a few red flags should prompt medical evaluation sooner rather than later:

• Pain that worsens with sitting or standing: This pattern, especially if it persists beyond two weeks, suggests bone involvement rather than a simple bruise.
• Pain radiating down the leg: While this can have many causes, a pelvic or sacral fracture compressing or irritating nearby nerves is one of them.
• Inability to bear weight: If standing or walking is severely limited after a fall onto the buttocks, a more significant fracture or pelvic ring injury needs to be ruled out.
• Numbness or weakness in the legs or perineum: These symptoms suggest nerve involvement and need urgent assessment.
• Swelling or firmness in the buttock: Rapid swelling after trauma could indicate bleeding into the gluteal compartment, which is a surgical emergency.

If your initial X-rays are normal but symptoms persist, do not assume nothing is wrong. The evidence consistently shows that fractures in this region hide on plain films. Asking for a CT scan or MRI when pain does not improve on schedule is not being difficult; it is being appropriately persistent about a diagnosis that clinicians themselves acknowledge is easy to miss.³