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Bone Bruise: Causes, Symptoms & Treatment
A bone bruise is a traumatic injury to the bone involving micro-fractures and bleeding in the bone marrow. It causes pain and is diagnosed by MRI.
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A bone bruise is a traumatic injury to the bone involving micro-fractures and bleeding in the bone marrow. It causes pain and is diagnosed by MRI.
What is a Bone Bruise?
A bone bruise, also called a bone contusion or bone marrow edema, is a traumatic injury to the internal structure of a bone. Unlike a complete fracture, a bone bruise involves microscopic damage to the trabecular (spongy) bone and bleeding within the bone marrow, without a visible break in the outer bone cortex. Bone bruises are not detectable on standard X-rays and can only be reliably identified using magnetic resonance imaging (MRI).
Causes
Bone bruises typically result from direct or indirect mechanical forces applied to the bone. Common causes include:
- Direct impact: A blow, fall, or collision that transmits force directly to the bone
- Sports injuries: Ligament tears, meniscus injuries, and joint sprains (especially of the knee) are frequently associated with bone bruises
- Stress injuries: Repetitive loading, as seen in long-distance runners or military recruits
- Joint compression injuries: Such as pivot-type knee injuries where two joint surfaces are forced together
Symptoms
The symptoms of a bone bruise can be persistent and more intense than those of a soft tissue injury. Typical symptoms include:
- Deep, localized pain at the site of injury, often felt deep within the joint or bone
- Swelling and tenderness over the affected area
- Pain with weight-bearing or activity that worsens with use
- Restricted range of motion in the nearby joint
- Prolonged pain lasting weeks to months, even at rest
Because bone marrow heals more slowly than soft tissue, a bone bruise often causes pain well beyond the initial injury period.
Diagnosis
The diagnosis of a bone bruise requires MRI, which is considered the gold standard. On MRI, the affected area appears as a region of bone marrow edema with characteristic signal changes. X-rays are typically used first to rule out fractures, but they cannot detect bone bruises.
- X-ray: Rules out complete fractures; does not visualize bone bruises
- MRI: Gold standard for detecting bone marrow edema and associated soft tissue injuries
- CT scan: Used as a supplement when complex fracture patterns are suspected
Treatment
Treatment for a bone bruise is primarily conservative, focusing on pain relief and protecting the bone during healing.
General Measures
- Rest and offloading: Avoiding stress on the affected area for several weeks to months
- Ice therapy: Applying ice in the acute phase to reduce swelling and pain
- Compression and elevation: Helpful for limb injuries to reduce edema
Medications
- NSAIDs (non-steroidal anti-inflammatory drugs): Such as ibuprofen or naproxen for pain and inflammation control
- In selected cases, bone-protective agents may be considered under medical supervision
Physical Therapy
- Targeted physiotherapy to restore strength, stability, and range of motion after the healing phase
- Manual therapy and proprioceptive training to regain full joint function
Healing Time
Bone bruises typically heal within 6 weeks to 6 months, depending on severity and location. Continued loading of the injured area can significantly delay healing and may lead to complications such as avascular necrosis (bone death due to impaired blood supply).
References
- Mandalia V. et al. - Bone bruising of the knee. Injury, 36(12):1456-1462, 2005. PubMed PMID: 16214475
- Zanetti M., Bruder E., Romero J., Hodler J. - Bone marrow edema pattern in osteoarthritic knees: correlation between MR imaging and histologic findings. Radiology, 215(3):835-840, 2000.
- Deutsch AL, Mink JH, Waxman AD. - Occult fractures of the proximal femur: MR imaging. Radiology, 170(1):113-116, 1989.
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