A bone bruise causes deep, aching pain that feels like it’s coming from inside the bone rather than the surface. Unlike a regular bruise on your skin or muscle, a bone bruise involves tiny fractures in the spongy inner tissue of the bone itself, and it won’t always show visible discoloration. That makes it tricky to identify on your own, since the main clue is persistent pain that doesn’t behave like a typical soft tissue injury.
What a Bone Bruise Actually Is
Bones aren’t solid all the way through. Beneath the hard outer shell is a network of spongy tissue called trabecular bone, filled with blood vessels and marrow. A bone bruise happens when an impact or twisting force creates microscopic fractures in that inner network. Blood and fluid leak into the damaged area, causing swelling inside the bone. This is different from a full fracture, where the break extends through the hard outer layer, but it’s more serious than a muscle or skin bruise.
There are three types of bone bruises, classified by where the damage sits. A subperiosteal hematoma forms just beneath the membrane that wraps around the outside of the bone. An interosseous bruise occurs deeper inside the bone’s spongy core. A subchondral bruise develops right beneath the cartilage surface of a joint. The subchondral type is especially common in knee injuries, and it’s the one most likely to affect how a joint moves and feels.
Signs That Point to a Bone Bruise
The hallmark symptom is deep, throbbing pain that feels different from a pulled muscle or a surface bruise. It tends to be very localized: you can often press on the exact spot and reproduce the pain. The ache typically worsens with activity or weight-bearing and may persist even at rest, especially at night.
Other signs to watch for:
- Swelling over or near the painful area that doesn’t improve after a few days of rest and icing
- Stiffness in a nearby joint, particularly if the bruise is close to a joint surface
- Pain that outlasts a normal bruise. A skin or muscle bruise typically improves noticeably within one to two weeks. Bone bruise pain lingers for weeks to months.
- No visible bruising, or bruising that doesn’t match the pain level. Many bone bruises produce little or no skin discoloration, which is why people often assume the injury is minor.
The duration is one of the most telling clues. If you took a hard hit or twisted a joint several weeks ago and the deep pain hasn’t faded, a bone bruise is a real possibility.
How It Differs From a Regular Bruise or Fracture
A soft tissue bruise hurts at the surface, turns colors as it heals, and usually resolves within two weeks. A bone bruise hurts deeper, often without much visible color change, and can take two to four months to fully resolve. A study following patients with bone bruises from knee ligament injuries found that complete resolution on imaging took two to four months in all cases, with the damaged area gradually returning to normal over that window.
Compared to a fracture, a bone bruise generally allows you to still use the injured area, though it hurts. A fracture often causes sharp, immediate pain that makes weight-bearing or movement feel impossible. That said, the line between a severe bone bruise and a stress fracture can be blurry. Returning to intense activity too soon can push a bone bruise into becoming a true fracture, since the weakened area hasn’t had time to rebuild.
Why X-Rays Won’t Show It
If you go to a doctor with a suspected bone bruise, a standard X-ray will almost certainly look normal. X-rays are good at detecting full fractures and changes in bone density, but a bone bruise involves fluid and microscopic damage that doesn’t show up on plain film. It can take a month or two before any changes even begin to appear on X-rays, long after the injury happened.
An MRI is the definitive tool for diagnosing a bone bruise. It can detect the fluid buildup inside the bone within two days of symptoms starting. On the scan, the bruised area appears as a bright signal in the bone marrow, showing exactly where the swelling and microdamage are. If your pain is severe enough or lasting long enough that your doctor suspects a bone bruise, an MRI is typically the next step.
Common Causes and Injury Patterns
Bone bruises most often result from direct impact (a fall, a collision in sports, banging your shin on furniture) or from a twisting injury to a joint. The knee is one of the most common locations, partly because it absorbs so much force during athletic movements.
They frequently occur alongside ligament injuries. More than 80% of people with a complete ACL tear also have bone bruises in the knee, visible on MRI. This happens because the same force that tears the ligament also slams the bones of the joint together. If you’ve been told you have a ligament injury and your bone pain seems disproportionate, a bone bruise is very likely part of the picture.
Bone bruises also show up in the wrist and hand from falls, the hip and pelvis from direct impacts, and the foot and ankle from repetitive stress (common in runners and dancers).
Recovery and What Helps
Most bone bruises heal within a few weeks, though more severe ones can take several months. The type of bone bruise, its location, and whether you have other injuries at the same time all affect the timeline. A mild bruise on the shin from bumping a table might resolve in three to four weeks. A deep subchondral bruise in the knee from a sports injury could take three to four months.
The most important thing you can do is protect the area from additional stress during healing. That means reducing or modifying activity so you’re not repeatedly loading the injured bone. For lower-body bruises, this might involve using crutches or a brace temporarily, or simply cutting back on running and jumping. For upper-body bruises, it means avoiding heavy lifting or repetitive impact through the affected area.
Rest, ice, and over-the-counter anti-inflammatory pain relief can help manage symptoms in the early weeks. Nutrition also plays a role: a diet rich in calcium, vitamin D, and protein supports the bone repair process. If you know your intake of any of these is low, it’s worth addressing during recovery.
The key risk during healing is doing too much too soon. The damaged area of bone is structurally weaker than normal, and putting heavy or repeated stress on it before it has rebuilt increases the chance of it progressing to a full fracture. A gradual return to activity, guided by how the area feels under increasing load, is the safest approach.