The bony ridge above your eye, commonly called the brow bone, is part of the frontal bone of the skull and can absolutely be broken. It takes serious force to do it, though. Research on cadavers estimates that a roughly 50 percent chance of frontal bone fracture occurs somewhere between about 1,900 and 2,400 newtons of force, which is far more than an accidental bump against a cabinet door.1PubMed. The tolerance of the frontal bone to blunt impact That kind of impact usually comes from car crashes, falls from height, assaults, or sports collisions. What happens after the break depends heavily on which part of the bone gave way and whether surrounding structures were damaged along with it.
Why the Brow Bone Is Hard to Break
The frontal bone is one of the thickest and strongest bones in the skull. Compared to the jawbone or the cheekbone, the frontal bone can withstand three to four times as much impact force before it fractures.2American Journal of Anatomy. Tolerance of the facial bones to impact Part of this toughness comes from the frontal sinus, a hollow, air-filled cavity inside the bone just above the eyebrows. In adults, this sinus acts a bit like a built-in crumple zone: the front wall of the sinus can absorb and distribute the energy of a blow before the force reaches the brain. That design is one reason frontal sinus fractures make up only about 5 to 12 percent of all facial fractures, even though the forehead is an exposed and commonly struck area.3PubMed Central. Complications of frontal sinus fractures
The flip side of needing so much force is that when this bone does break, the injuries tend to be serious. The impact was enormous, so there is often damage to other nearby structures: the eye socket, the nose, the base of the skull, or even the brain itself. Doctors treating a frontal bone fracture almost always look for these associated injuries, because the brow bone fracture alone is rarely the whole story.
What a Brow Bone Fracture Looks Like and How Doctors Find It
The most obvious sign is a visible dent or depression in the forehead above the eye. Swelling, bruising, and pain are immediate, and the area is usually tender to touch. Some people notice that their forehead looks flattened or asymmetric once the initial swelling starts to go down, because the broken bone has caved inward.4Journal of Craniofacial Surgery. Endoscopic Repair of Isolated Anterior Table Frontal Sinus Fractures Without Fixation If the fracture extends into the eye socket, you might also have swelling around the eye, restricted eye movement, or double vision.
A CT scan is the standard tool for diagnosing these fractures. Standard brain CT scans pick up frontal bone fractures reliably. One study found that brain CT detected all frontal bone fractures in their sample, with an overall accuracy for facial fractures of about 94 percent.5Clinical and Experimental Emergency Medicine. Diagnostic performance of brain computed tomography to detect facial bone fractures A dedicated facial CT with thin slices gives more detail when surgeons need to plan a repair, but for the initial emergency evaluation, the brain CT that most trauma patients already receive does a good job catching these breaks.
Anterior Table Versus Posterior Table Fractures
The frontal sinus has two walls, and which one breaks makes a huge difference in how the injury is managed. The anterior table is the outer wall, the part you can feel under the skin of your forehead. The posterior table is the inner wall, which sits right against the membranes covering the brain. Many brow bone fractures involve only the anterior table. These are generally less dangerous because the brain’s protective lining stays intact.
Posterior table fractures are a different matter entirely. When the inner wall breaks, there is a risk of tearing the dura, the tough membrane around the brain. That tear can create a path for cerebrospinal fluid to leak out through the nose or, less commonly, the ear. CSF leaks are more common with fractures near the base of the skull, including frontal bone fractures, because the dura is firmly attached to the bone in this area and tends to tear when the bone gives way.6PubMed Central. Maxillofacial trauma and cerebrospinal fluid leak: a retrospective clinical study A CSF leak is serious because it opens a direct channel between the outside world and the brain, raising the risk of meningitis. Most small leaks seal on their own within a week or so, but larger or persistent leaks need surgical repair.
A fracture can also damage the frontal sinus outflow tract, the narrow channel that drains mucus from the sinus into the nose. If this drainage path gets blocked by displaced bone fragments or scar tissue, mucus builds up inside the sealed-off sinus. Over time, that trapped mucus can form a mucocele, a slow-growing cyst that expands and erodes into surrounding bone. One review found that the most common cause of post-traumatic mucoceles was craniofacial trauma, accounting for the vast majority of cases.7PubMed Central. Post Traumatic Frontal Sinus Mucocele with Subcutaneous Extension: A Case Report and Literature Review Mucoceles can appear years or even decades after the original injury, which is why long-term follow-up matters even when the initial fracture seems to have healed well.
When Surgery Is Needed and When It Is Not
Not every brow bone fracture requires an operation. If the break is stable and the bone has not shifted out of position, doctors typically monitor the injury with follow-up imaging and let it heal on its own.8PubMed Central. Management of Frontal Sinus Injuries The main reasons for surgery are a visible forehead depression that would leave a permanent cosmetic defect, a posterior table fracture with a CSF leak, or signs that the sinus drainage pathway is blocked.
Surgical approaches have become less aggressive over the past couple of decades. Older practice favored wide-open incisions and, in severe cases, completely obliterating the sinus by filling it with fat or bone to prevent future complications. While obliteration is still sometimes necessary for badly damaged posterior table fractures, the field has shifted toward more conservative strategies. Newer tools like bioabsorbable plates and endoscopic techniques allow surgeons to repair fractures through smaller incisions with less disruption to the surrounding tissue.9PubMed Central. Frontal sinus fractures: a conservative shift
For depressed anterior table fractures, the standard repair involves lifting the sunken bone back into position and securing it with titanium mini-plates and screws, or sometimes titanium mesh for more comminuted breaks where the bone is in several pieces. Case reports describe good outcomes with this approach, with smooth recovery and no complications when the fracture involves only the outer wall.10Journal of Surgical Research and Reviews. Management of frontal bone fracture in a resource challenge setting: Case report and literature review The cosmetic result is usually the primary concern here, since an untreated depression in the forehead is quite noticeable.
How Long Recovery Takes
Facial bones heal through a process called membranous ossification, which is slower than how limb bones mend. Imaging studies show that the fracture line stays clearly visible on CT for the first week after injury, then becomes blurred and thickened along its edges over the following two to three weeks as new bone starts to form. The fracture can remain visible on scans for more than two months, and in some cases the broken edges never fully fuse with solid bone. Instead, they connect with fibrous tissue, and some bone around the fracture site gets reabsorbed over time.11Scientific Reports. Dynamic changes of facial skeletal fractures with time
For most people with an isolated anterior table fracture, the acute pain and swelling settle within a few weeks. Returning to contact sports or activities with a risk of another blow to the face usually needs to wait at least six to eight weeks, though the timeline varies with the severity of the break and whether hardware was placed. People who had posterior table involvement, a CSF leak, or sinus obliteration face a longer recovery and need regular follow-up imaging for years to catch late complications like mucoceles.
Double Vision After Orbital Involvement
When a brow bone fracture extends into the roof or walls of the eye socket, it can trap or compress the muscles that move the eye. Double vision is one of the most distressing symptoms that can follow. In blowout fractures of the orbit, which can accompany brow bone injuries, the reported rate of double vision ranges from about 44 to 83 percent.12PubMed Central. Is Surgery Needed for Diplopia after Blowout Fractures? A Clarified Algorithm to Assist Decision-making Not all of these cases need surgery. Many resolve as swelling goes down and trapped tissue is released naturally. But when double vision persists beyond a couple of weeks, surgical exploration to free the trapped muscle or repair the orbital floor becomes the standard recommendation. Even after surgery, about one in five patients still has some degree of double vision a year later, so the prognosis is honest but not always perfect.
Brow Bone Fractures in Children
Children younger than about seven face a slightly different situation because their frontal sinuses have not yet developed. In adults, the air-filled sinus provides that built-in shock absorber. In young children, the bone in this region is solid, which changes the fracture pattern. Without a sinus cavity, the force of a blow transmits more directly to the base of the skull, and fractures in this area can extend into the anterior cranial floor.13PubMed. Frontobasilar fractures in children This means that a frontal bone fracture in a young child raises higher suspicion for associated brain injury than the same fracture in an adult.
On the repair side, children’s bones heal faster and remodel more readily. When surgical fixation is needed, resorbable plates and screws that dissolve over time have shown good results in pediatric facial fractures, with no long-term implant-related complications in reported series.14PubMed. Use of resorbable plates and screws in pediatric facial fractures These materials avoid the need for a second surgery to remove hardware and eliminate concerns about metal implants interfering with skull growth.
Protective Gear and Prevention
Since the most common causes of frontal bone fractures are motor vehicle collisions, falls, and assaults, prevention overlaps with general injury prevention: seatbelts, helmets for cycling and motorized sports, and fall-proofing for older adults. In combat sports like boxing, the question of headgear is worth a closer look. A systematic review of protective headgear in Olympic boxing found that headguards protect well against facial cuts and skull fractures, though their effect on concussion prevention is less clear.15PubMed. Concussions, cuts and cracked bones: A systematic literature review on protective headgear and head injury prevention in Olympic boxing The padding distributes the force of a punch across a larger area, which keeps the peak force below the threshold needed to crack bone. It is worth noting that the International Boxing Association removed mandatory headguards from men’s Olympic competition in 2013, citing concerns that the larger target profile of the headguard actually increased the total number of blows absorbed, though the debate continues.
For recreational athletes in sports like soccer, lacrosse, or mountain biking, a well-fitted helmet remains the best defense. The brow bone sits right at the edge of most helmet designs, and a helmet that rides too high on the forehead may leave the supraorbital ridge exposed. Ensuring your helmet sits level, with the front edge about a finger’s width above your eyebrows, gives the best coverage to this area.
Why Modern Humans Have Flatter Brow Bones
If you have ever looked at a skull of an earlier human relative, the massive, shelf-like browridge is one of the most striking features. Anatomically modern humans are unusual among primates in having a relatively flat forehead instead. Researchers have debated whether those ancient browridges served a structural purpose, like reinforcing the skull against chewing forces or bridging the gap between the brain case and the eye sockets. A study using virtual modeling of an archaic hominin skull found that neither explanation fully accounts for how large the ridges actually were. The browridge of the fossil they tested was far bigger than structural demands alone would require, and shaving it down in the model had little impact on how well the skull handled biting forces.16Nature Ecology & Evolution. Supraorbital morphology and social dynamics in human evolution
The researchers proposed that the shift from a heavy browridge to a flatter, more vertical forehead in modern humans made room for more mobile eyebrows, which play a central role in nonverbal communication. Think of how much information a raised eyebrow or a furrowed brow conveys. The trade-off may have been structural protection for social signaling. Our brow bones are thinner and less prominent than those of our ancestors, which is part of why they can still break under high-energy impacts. We essentially traded some natural armor for the ability to look surprised or skeptical from across a room.
What “Eyebrow Bone” Actually Refers To
People searching for information about a broken eyebrow bone are usually talking about one of two closely related structures. The supraorbital ridge is the bony arch you can feel directly above each eye socket, running along the lower edge of the forehead. The frontal bone is the larger plate of skull that forms the entire forehead and includes the supraorbital ridge as its lower margin. In medical terms, a “brow bone fracture” almost always means a frontal bone fracture, because the ridge is not a separate bone but a thickened part of the frontal bone.
There is sometimes confusion with the orbital rim, which is the bony ring surrounding the eye socket. The superior orbital rim is essentially the same structure as the supraorbital ridge, just described from the eye socket’s perspective. A fracture here can involve the roof of the orbit, the frontal sinus, or both, which is why the diagnosis often sounds more complicated than “you broke your eyebrow bone.” When doctors talk about an anterior table fracture, a superior orbital rim fracture, or a frontal sinus fracture, they may all be describing injuries in essentially the same neighborhood, just defined by which part of the bone gave way and which cavity was affected.
One practical note: if you have been told you have a “supraorbital fracture” or “frontal bone fracture” after an injury, the single most important question to ask your surgeon is whether the posterior table is intact. If it is, the injury is primarily a cosmetic and structural concern. If it is not, the stakes are higher because of the risk of brain-related complications, and the follow-up plan will be more involved and longer-lasting.