A bone bruise doesn’t look like a typical bruise on the surface. Unlike a regular bruise that shows a dramatic purple or blue patch within hours, a bone bruise often produces surprisingly little visible discoloration on the skin. What you’re more likely to notice is persistent swelling, stiffness in a nearby joint, and deep pain that seems out of proportion to what you can actually see. The real picture of a bone bruise only becomes clear on an MRI, which is why many people feel confused when their injury looks minor on the outside but hurts far more than expected.
What You See on the Surface
A standard soft tissue bruise happens when tiny blood vessels under the skin break, creating that familiar dark blue or purple patch within a few hours of impact. A bone bruise is deeper. The damage occurs inside the bone itself, so the surface signs are subtler and sometimes absent altogether.
When external signs do appear, they typically include swelling over the injured area, a hard lump near the bone, and some changes to skin color. But the discoloration is usually less vivid than a regular bruise because the bleeding is happening deep within the bone’s interior rather than just beneath the skin. You might see mild redness or a faint bruise, or you might see nothing at all. The hallmark of a bone bruise isn’t what it looks like. It’s what it feels like: deep, aching pain that worsens with pressure or weight-bearing, and stiffness in the nearest joint.
What a Bone Bruise Looks Like on MRI
The only way to truly “see” a bone bruise is through an MRI. Standard X-rays won’t show one because they detect full fractures, not the microscopic damage inside a bone bruise. On MRI, a bone bruise appears as a bright white area on certain types of scans (called fluid-sensitive sequences) and a dark area on others. These contrasting signals tell radiologists that fluid, swelling, and small amounts of bleeding have accumulated inside the bone marrow.
What’s actually happening at the tissue level is a combination of three things: swelling within the marrow, small hemorrhages, and tiny fractures along the bone’s internal scaffolding (the network of thin supportive struts called trabeculae). Biopsies of bone bruises have confirmed all three of these features. So a bone bruise is really a collection of microfractures, not just a “bruise” in the way most people think of one. The bone’s outer shell stays intact, but the interior structure is damaged.
Three Types of Bone Bruises
Not all bone bruises look or behave the same way. The type depends on where inside the bone the damage occurs.
- Subperiosteal hematoma: Blood collects just beneath the periosteum, the thin membrane that wraps around the outside of the bone. This type is the most likely to produce visible swelling and a noticeable lump because the bleeding is closest to the surface.
- Subchondral bone bruise: Bleeding and swelling happen in the layer between the cartilage and the bone underneath it. These are common in joints like the knee after a twisting injury or direct impact, and they often cause joint stiffness and effusion (fluid buildup in the joint).
- Intraosseous bone bruise: The bleeding and swelling occur deep inside the bone’s marrow cavity. This type produces the least visible surface change but can cause significant deep pain.
Where Bone Bruises Happen Most
Bone bruises most commonly affect weight-bearing bones and joints. The knee is one of the most frequent locations, particularly after sports injuries, falls, or car accidents. The shinbone (tibia) is especially vulnerable because of its size and its role in supporting your body weight. Bone bruises also occur in the ankle, hip, wrist, and foot, essentially anywhere a high-energy force strikes bone hard enough to damage its internal structure without fully breaking through.
Contact sports, falls from a height, and direct blows are the usual causes. A sudden twisting motion can also produce a bone bruise in a joint, especially the knee, even without an obvious impact.
How It Differs From a Fracture
A bone bruise and a fracture exist on a spectrum of bone injury. The key practical differences come down to pain intensity and function. A bone bruise typically causes mild to moderate pain that’s manageable, while a fracture tends to produce intense pain that doesn’t let up. If you can’t bear weight on a leg or can’t use an injured arm at all, that points more toward a fracture than a bruise.
That said, a bone bruise can still hurt significantly, and the two injuries can’t always be distinguished without imaging. An X-ray will rule out a full fracture, but only an MRI will reveal a bone bruise. If your pain seems disproportionate to what an X-ray shows, an MRI is the logical next step.
How Long Bone Bruises Take to Heal
Bone bruises heal slowly compared to soft tissue bruises. A regular bruise fades in two to four weeks. A bone bruise takes much longer. One study tracking bone bruises of the knee found that individual bruises took a median of about 33 weeks to fully resolve on follow-up MRI, and when researchers looked at overall patient recovery (since many people had multiple bruises), the median healing time stretched to roughly 42 weeks. That’s close to 10 months.
This doesn’t mean you’ll be in significant pain for that entire period. Symptoms typically improve well before the MRI findings fully clear. But it does explain why a bone bruise can linger for months when a “normal” bruise would have disappeared weeks ago. Rest, avoiding high-impact activity on the injured area, and gradual return to weight-bearing are the core of recovery. Pushing through the pain too early risks extending the healing timeline or worsening the microfractures.
When Pain Doesn’t Match What You See
The most disorienting thing about a bone bruise is the mismatch between appearance and experience. You may have little or no visible bruising, a normal X-ray, and still be dealing with real, persistent pain that limits what you can do. That gap is the signature of a bone bruise. The damage is hidden inside the bone, invisible to the eye and to standard X-rays, but very real on MRI and very real in terms of how it feels. If you’re dealing with deep bone pain after an impact that seems like it should have healed by now, a bone bruise is one of the most likely explanations.