Avascular Necrosis (AVN)

• What is AVN? Damage to bone tissue associated with reduced blood supply.
• Most commonly affected joint: The hip, especially the femoral head.
• Common AVN causes: Corticosteroid use, heavy alcohol consumption, certain blood disorders and hip injuries.
• Common AVN symptoms: Deep groin pain, hip pain while walking and restricted movement.
• Key diagnostic test: MRI is highly sensitive for detecting early avascular necrosis.
• Why early diagnosis matters: Treatment may have a better chance of preserving the natural joint before significant collapse occurs.
• AVN treatment options: Observation, activity modification, pain management, selected joint-preserving procedures and total hip replacement.

Bone is living tissue that needs a continuous blood supply to stay healthy and repair minor damage. In avascular necrosis of the hip, blood flow to a section of bone becomes inadequate, causing bone cells to die.

The condition commonly affects the femoral head, which fits into the socket of the pelvis and allows the hip to move smoothly. When the affected bone becomes weaker, it may no longer support the joint surface properly.

As hip AVN progresses, small fractures can develop beneath the cartilage. The femoral head may then flatten or collapse, damaging the cartilage and potentially leading to secondary hip arthritis.

AVN does not progress at the same rate in everyone. Some areas of bone damage remain stable, while others worsen over time. The size and location of the affected area, the stage of the condition and the presence of joint collapse all influence treatment decisions.

There is no single cause of avascular necrosis (AVN). The condition may develop after an injury or in association with medical conditions and other factors that affect blood flow to the bone.

Common causes and risk factors include:

• Hip fracture or dislocation: An injury can damage the blood vessels supplying the femoral head.
• Corticosteroid use: Long-term or high-dose steroid treatment is associated with an increased risk of AVN in some patients.
• Heavy alcohol consumption: Prolonged heavy drinking is associated with an increased risk of bone damage and AVN.
• Sickle cell disease: Abnormal red blood cells can obstruct small blood vessels and affect circulation.
• Autoimmune conditions: Conditions such as lupus may be associated with AVN, including through their treatment.
• Blood clotting disorders: Certain conditions can interfere with normal blood flow through small vessels.
• Other medical treatments: Radiation therapy and some other treatments may be associated with bone damage, depending on the circumstances.

Sometimes, doctors cannot identify a definite cause. This is known as idiopathic AVN.

Although AVN is often diagnosed in adults, younger people can also develop the condition. A person’s medical history, symptoms and risk factors help determine whether further investigation is needed.

Avascular necrosis is generally classified according to its cause.

Traumatic AVN

Traumatic avascular necrosis develops after an injury that damages the blood supply to the bone. A fracture of the femoral neck or a hip dislocation can increase the risk of AVN affecting the femoral head.

Non-Traumatic AVN

Non-traumatic AVN develops without a direct injury. It may be associated with long-term corticosteroid use, heavy alcohol consumption, sickle cell disease, autoimmune conditions and certain blood disorders.

Idiopathic AVN

Idiopathic avascular necrosis refers to cases in which the underlying cause remains unknown despite an appropriate medical evaluation.

Identifying the possible cause helps guide treatment and risk-factor management. Because AVN can affect both hips, the doctor may recommend assessment of the opposite hip when clinically appropriate.

Corticosteroid Use and Avascular Necrosis

Corticosteroids are important medicines used to manage conditions such as asthma, autoimmune diseases and severe inflammation. However, prolonged or high-dose corticosteroid use is associated with an increased risk of avascular necrosis in some patients.

The exact mechanisms are complex and may involve changes in fat metabolism, pressure inside the bone and blood flow through small vessels.

If you have taken corticosteroids and develop persistent hip or groin pain, discuss your symptoms and medical history with your doctor.

Never stop prescribed corticosteroids or change your dosage without medical advice. Your treating doctor can assess your medication and advise you on the appropriate next steps.

Alcohol Consumption and AVN

Heavy, long-term alcohol consumption is associated with an increased risk of hip AVN. Changes in fat metabolism and bone health may contribute to the condition.

Reducing or avoiding alcohol may help address this risk factor, but it cannot reverse established bone damage. If you have already been diagnosed with AVN, your treatment plan should be based on the extent of bone involvement and your overall health.

You may need medical assessment if you have persistent hip pain along with any of the following risk factors:

• A history of long-term or high-dose steroid use.
• Regular heavy alcohol consumption.
• A previous hip fracture or dislocation.
• Sickle cell disease or certain blood clotting disorders.
• Lupus or another autoimmune condition.
• A previous diagnosis of AVN in one hip.
• A medical condition that may affect blood circulation or bone health.

Having one of these risk factors does not automatically mean that you will develop AVN. However, persistent symptoms should be checked rather than dismissed as routine joint pain.

AVN hip symptoms can begin gradually. During the early stages, the discomfort may be mild or occur only during certain activities. As the condition progresses, pain may become more frequent and interfere with everyday movement.

Common symptoms of avascular necrosis of the hip include:

• Deep pain in the groin or hip.
• Hip pain while walking, standing or climbing stairs.
• Pain that spreads to the thigh, buttock or knee.
• Stiffness and reduced hip movement.
• Limping or difficulty bearing weight.
• Difficulty putting on shoes or socks.
• Pain at rest or during the night in more advanced cases.

Some people experience few symptoms during early AVN. The absence of severe pain does not necessarily mean that the bone is unaffected.

Pain can develop because of changes within the bone, inflammation and increased pressure in the affected area. As avascular necrosis progresses, small fractures or collapse of the femoral head may damage the joint surface.

This can make movement increasingly painful and affect walking, sleep, work and daily activities.

Hip pain can have several causes, so symptoms alone cannot confirm AVN. A clinical examination and appropriate imaging are important for identifying the underlying problem.

Arrange an orthopaedic assessment if hip or groin pain continues for more than two to three weeks, particularly if you have a history of corticosteroid use, heavy alcohol consumption, a hip injury or a medical condition associated with AVN.

An MRI for AVN may be recommended if the condition is suspected even when X-rays appear normal.

Seek urgent medical assessment if you develop sudden severe hip pain, cannot bear weight after an injury or experience rapidly worsening symptoms.

AVN diagnosis involves reviewing your symptoms, medical history and imaging results. The aim is to identify the affected area, determine the extent of bone damage and establish whether the femoral head has collapsed.

1. Medical History and Clinical Examination

The doctor will ask about your pain, activity limitations, previous injuries, medication use and relevant medical conditions.

The examination may include checking hip movement, tenderness, walking pattern and your ability to bear weight.

2. X-Ray for AVN

An X-ray of the hip helps assess the joint structure and identify changes such as flattening of the femoral head, bone collapse or secondary arthritis.

However, X-rays may appear normal during early-stage AVN. A normal X-ray does not always rule out the condition.

3. MRI for Avascular Necrosis

An MRI of the hip is highly sensitive for detecting early AVN. It can help identify the location and extent of bone involvement before changes become visible on X-rays.

MRI findings also help the doctor assess the stage of the condition and discuss suitable treatment options.

4. Assessment of the Opposite Hip

Bilateral AVN, which means AVN affecting both hips, can occur. Depending on your symptoms, medical history and initial findings, the doctor may recommend imaging of the opposite hip.

Bring previous X-rays, MRI scans, medical reports and a list of current medicines to your consultation.

AVN stages are classified using systems such as ARCO and Ficat. These systems assess the extent of bone damage and structural changes, but their stages do not correspond exactly to one another.

The following table provides a simplified overview.

The right AVN treatment in Navi Mumbai depends on the stage of the condition, the size and location of the damaged area, whether the femoral head has collapsed, your age and your activity requirements.

Treatment may focus on managing pain, reducing stress on the affected hip, preserving the natural joint where possible or replacing a severely damaged joint.

Dr. Abhay Chhallani evaluates the available options according to the patient’s condition. Not every patient needs surgery, and not every patient is suitable for a joint-preserving procedure.

AVN treatment without surgery may be considered for selected patients, particularly when the femoral head has not collapsed or surgery is not appropriate at the current time.

Pain Management

Pain-relieving medicines, including non-steroidal anti-inflammatory drugs (NSAIDs), may help manage symptoms when prescribed appropriately. Their suitability depends on your medical history, other medicines and possible side effects.

Protected Weight-Bearing

Reducing the load on the affected hip may help manage discomfort. A walking stick or crutches may be recommended according to the extent of bone damage and your ability to walk.

Your doctor or physiotherapist can explain how much weight you should place on the affected leg.

Guided Physiotherapy

Physiotherapy for AVN may help maintain joint movement, improve muscle strength and support mobility. Exercises should be selected according to the stage of the condition and your symptoms.

High-impact activities may need to be avoided when the bone is structurally weakened.

Risk-Factor Management

Your doctor may discuss reducing alcohol consumption, reviewing corticosteroid treatment with the prescribing clinician and managing relevant medical conditions.

Selected Medicines and Emerging Treatments

Some medicines and biologic approaches have been studied for AVN, but the evidence and suitability vary. These treatments should not be considered established cures or substitutes for appropriate medical assessment.

Non-surgical management may help control symptoms and reduce stress on the joint, but it cannot reliably restore bone tissue that has already died or reverse established collapse. Regular follow-up is important to monitor changes.

Stage 3 AVN treatment without surgery depends on the extent of structural damage, the size and location of the affected area, pain severity and the condition of the hip joint.

Non-surgical measures may help manage symptoms and reduce stress on the hip. However, they cannot reverse an established collapse.

Some patients may be candidates for selected procedures, while others with substantial joint damage may benefit more from hip replacement surgery. The treating surgeon can explain the likely benefits, limitations and risks after reviewing your scans.

AVN surgery may be considered when the expected benefits outweigh the risks and non-surgical management is insufficient or unlikely to meet the patient’s needs.

The choice of procedure depends on whether the femoral head is intact, the amount of bone damage and the condition of the joint cartilage.

Core Decompression Surgery for AVN

Core decompression for AVN is a joint-preserving procedure in which a small channel is created in the affected bone to reduce pressure and potentially support healing responses.

Who may be suitable?

Core decompression is generally considered for selected patients with early-stage AVN before significant femoral-head collapse.

What is the goal?

The aim is to relieve symptoms and potentially delay progression or the need for hip replacement in suitable cases.

What are the limitations?

Results vary according to the extent of the lesion and the stage of AVN. Core decom

In selected cases, additional techniques such as bone grafting or bone marrow-derived treatments may be discussed. Their suitability and supporting evidence vary.

Bone Grafting for AVN

Bone grafting for AVN involves placing bone material into the damaged area to support the joint surface and help the bone heal. Some techniques use bone that keeps its own blood supply, known as a vascularised bone graft.

Who may be suitable? Selected patients, often younger, with a larger lesion and little or no collapse may be considered.

What are the limitations? It is a more involved procedure and usually needs a period of protected weight-bearing. Results vary, and it may not be suitable once the joint is badly damaged.

Osteotomy for AVN

Osteotomy reshapes and realigns the bone so that body weight falls on healthier areas of the femoral head. It is generally considered for carefully selected, usually younger, patients with a well-defined area of damage.

Recovery can be long, and the procedure is not suitable for every patient.

Total Hip Replacement for AVN

Total hip replacement for AVN replaces the damaged joint surfaces with an artificial implant. It is usually considered when the femoral head has collapsed, pain is significant and arthritis has developed.

Because AVN often affects younger adults than ordinary arthritis, the implant type and bearing surface are discussed individually. Read more about hip replacement surgery in Navi Mumbai. If an earlier implant has worn or loosened, revision hip replacement may need to be considered.

Recovery depends on the procedure, your age and your general health. The table gives general guidance only, and your surgeon will explain a personal plan.

Follow your physiotherapy plan, attend all follow-up visits and avoid alcohol unless your doctor advises otherwise.

AVN Treatment Success Rate

The success rate of AVN treatment depends on the stage at diagnosis, the size of the damaged area, the cause, your age and whether triggers such as steroids or alcohol continue. Joint-preserving treatment generally has a better chance in early stages. After collapse, hip replacement is a dependable option for lasting pain relief. A realistic outlook is possible only after an examination and MRI.

Prevention and Lifestyle Advice

• Limit alcohol intake.
• Use corticosteroids only as prescribed and review long courses with your doctor.
• Get hip injuries and persistent groin pain checked promptly.
• Manage cholesterol and blood sugar, and avoid smoking.
• If one hip has AVN, ask whether the other hip should be checked.

Consult an AVN Specialist in Nerul, Navi Mumbai

Looking for an AVN specialist in Navi Mumbai? Dr. Abhay Chhallani reviews your symptoms and scans, explains your stage in simple language and discusses suitable options without recommending surgery that is not needed. Patients visit from Nerul, Seawoods, Vashi, Kharghar, Belapur, Panvel and Airoli. You can read patient testimonials or book a consultation. Please bring your previous scans, reports and a list of current medicines.