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Bone Infarction – Causes, Symptoms and Treatment

A bone infarction is the death of bone tissue caused by a loss of blood supply. It can affect any bone and may lead to pain, joint damage, and loss of function.

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Things worth knowing about "Bone infarction"

A bone infarction is the death of bone tissue caused by a loss of blood supply. It can affect any bone and may lead to pain, joint damage, and loss of function.

What is a Bone Infarction?

A bone infarction, also known as avascular necrosis (AVN) or osteonecrosis, occurs when the blood supply to a section of bone is interrupted. Without adequate blood flow, bone cells (known as osteocytes) begin to die, leading to structural deterioration and, in severe cases, collapse of the affected bone. When this process involves the head of a joint, it is often referred to as avascular necrosis of the femoral head (hip) or the corresponding joint.

Causes

Bone infarction can result from a variety of underlying causes:

Trauma: Fractures or dislocations that damage the blood vessels supplying the bone.
Corticosteroid therapy: Long-term or high-dose use of corticosteroids is one of the most common non-traumatic causes.
Alcohol misuse: Chronic excessive alcohol consumption impairs circulation and bone metabolism.
Blood disorders: Including sickle cell disease, coagulation disorders, and polycythemia vera.
Decompression sickness: Also known as the bends, in which gas bubbles form in the blood and block vessels.
Systemic diseases: Such as systemic lupus erythematosus, Gaucher disease, or other conditions affecting blood vessels or bone metabolism.
Idiopathic: In some cases, no identifiable cause is found.

Symptoms

The symptoms of a bone infarction depend on the location and extent of the affected area. Common presentations include:

Pain: Often the first sign, initially triggered by activity and later occurring at rest.
Limited range of motion: Especially when joints such as the hip, knee, or shoulder are involved.
Swelling and tenderness: Around the affected area.
Joint stiffness: As the cartilage surrounding the joint becomes progressively damaged.

In early stages, a bone infarction may be completely asymptomatic and is often discovered incidentally during imaging for another condition.

Diagnosis

Several imaging and laboratory methods are used to diagnose bone infarction:

MRI (Magnetic Resonance Imaging): The most sensitive method for early detection, revealing changes before they appear on conventional imaging.
X-ray: Typically shows changes only in later stages, such as bone sclerosis or collapse.
CT (Computed Tomography): Used to assess bone structure in detail.
Bone scintigraphy: Can detect increased metabolic activity in the affected region.
Blood tests: To identify underlying conditions such as clotting disorders or metabolic diseases.

Treatment

Treatment depends on the stage of the disease, the bone involved, and any underlying causes.

Conservative Treatment

Offloading: Reducing weight-bearing on the affected bone, for example using crutches.
Pain management: Use of analgesics and non-steroidal anti-inflammatory drugs (NSAIDs).
Physiotherapy: To maintain joint mobility and strengthen surrounding muscles.
Treatment of the underlying cause: Such as tapering corticosteroids or managing a clotting disorder.

Surgical Treatment

Core decompression: Drilling into the necrotic area to relieve pressure and promote revascularization, most effective in early stages.
Bone grafting: Transplanting healthy bone tissue to support the damaged area.
Joint replacement (endoprosthesis): When joint damage is advanced, total hip or knee replacement may be necessary.

Prognosis

The outlook for bone infarction depends greatly on the size of the affected area, the bone involved, and how early treatment begins. Cases identified and treated early generally have a favorable prognosis. In advanced or untreated cases, structural collapse of the bone and severe joint destruction may occur, significantly impairing quality of life.

References

Mont MA, Marker DR, Zywiel MG, Carrino JA. Osteonecrosis of the knee and related conditions. Journal of the American Academy of Orthopaedic Surgeons. 2011;19(8):482-494.
Assouline-Dayan Y, Chang C, Greenspan A, Shoenfeld Y, Gershwin ME. Pathogenesis and natural history of osteonecrosis. Seminars in Arthritis and Rheumatism. 2002;32(2):94-124.
Kaushik AP, Das A, Cui Q. Osteonecrosis of the femoral head: An update in year 2012. World Journal of Orthopedics. 2012;3(5):49-57.

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