Aseptic necrosis of the femoral head means that part of the ball of the hip joint (the femoral head) dies because the blood supply stops, but there is no infection. “Aseptic” means “not due to germs.” The bone cells slowly die, the bone becomes weak, and the smooth round ball of the hip can collapse and lose its shape. When this happens, the hip joint does not move smoothly, and this causes pain, stiffness, and difficulty walking. Doctors also say “osteonecrosis” or “avascular necrosis,” because the main problem is loss of blood (avascular) and death of bone tissue (necrosis).
Aseptic necrosis of the femoral head, also called osteonecrosis or avascular necrosis, happens when the blood supply to the ball of the hip joint (femoral head) becomes too low, but there is no infection. Without enough blood, the bone cells slowly die, the bone becomes weak, and the smooth round shape of the femoral head can collapse. This can lead to early hip arthritis, pain, stiffness, and difficulty walking, especially in young and middle-aged adults. Common risk factors include high-dose or long-term steroids, heavy alcohol use, trauma (like hip fractures or dislocations), blood-clotting problems, and some autoimmune or blood diseases. Early diagnosis and treatment are very important to keep the hip joint working and to delay or avoid hip replacement surgery.
Over time, this disease usually goes through stages. At first, the hip may look normal on X-ray, even though the bone cells are already damaged. Later, the bone under the joint surface becomes weak, a thin crack appears, and finally the femoral head flattens and the joint space narrows. If no treatment is given, many patients eventually need hip replacement surgery because of severe pain and loss of function.
Other names
Doctors and books use several other names for aseptic necrosis of the femoral head. All of these names describe the same basic problem: death of bone in the femoral head due to poor blood flow, without infection.
Avascular necrosis (AVN) of the femoral head – “Avascular” means “without blood vessels.”
Osteonecrosis of the femoral head – “Osteo” means bone, “necrosis” means tissue death.
Ischemic necrosis of the femoral head – “Ischemia” means lack of blood supply.
Aseptic osteonecrosis of the hip – highlights that there is no infection.
In some articles, osteonecrosis of the femoral head is also called the “coronary disease of the hip,” because, like a heart attack, the core problem is a sudden or long-term loss of blood flow to tissue that needs oxygen.
Types
There are many ways to group (classify) aseptic necrosis of the femoral head. These types help doctors think about cause, stage, and side, and help to plan treatment.
Traumatic vs. non-traumatic type:
In the traumatic type, the problem starts after a clear injury, such as a femoral neck fracture or a hip dislocation that damages the blood vessels. In the non-traumatic type, there is no large injury; instead, long-term steroid use, alcohol use, blood-clot problems, or other diseases slowly damage the blood supply.Early-stage vs. late-stage type:
Early stages may show normal X-rays but abnormal MRI, while the patient has mild or no symptoms. In later stages, X-rays show a “crescent sign,” flattening of the femoral head, and arthritis of the hip, and pain is usually strong and constant.Unilateral vs. bilateral type:
In unilateral disease, only one hip is affected. In bilateral disease, both hips are affected (often at different stages). Many patients with steroid use, alcohol use, or autoimmune disease have both hips involved, which increases disability.Disease-related types:
Doctors sometimes name the type based on the main related disease, such as “steroid-induced osteonecrosis,” “alcohol-related osteonecrosis,” “sickle-cell related osteonecrosis,” or “lupus-related osteonecrosis,” to remind themselves of the key risk factor that must be controlled.
Causes
Below are 20 important causes or risk factors. In many patients, more than one cause is present.
Femoral neck fracture
A break in the neck of the femur can tear or block the small arteries that run to the femoral head. Even after the bone is fixed with surgery, the blood supply may not fully recover. Months later, the femoral head can slowly die and collapse, causing pain and stiffness in the hip.Hip dislocation
When the hip joint is dislocated, the ball comes out of the socket. This can twist or stretch the blood vessels that feed the femoral head. Even after the hip is put back in place, the damaged vessels may not carry enough blood, and osteonecrosis may appear later.Long-term high-dose corticosteroid use
Long-term use of steroids like prednisone is one of the most common non-traumatic causes. Steroids may increase fat inside the bone marrow, cause tiny clots in vessels, and raise pressure in the bone, all of which reduce blood flow and lead to bone cell death.Heavy alcohol use
Drinking large amounts of alcohol over time can change fat metabolism, promote formation of fat emboli, and injure bone cells. Alcohol also affects blood vessels. Together, these changes can block blood supply to the femoral head and cause osteonecrosis.Sickle cell disease and other hemoglobin disorders
In sickle cell disease, red blood cells become stiff and sickle-shaped. These cells can block tiny vessels in the bone, causing repeated small “bone infarcts.” Over time, the femoral head may lose its normal blood supply and undergo aseptic necrosis.Systemic lupus erythematosus (SLE)
People with lupus have higher risk because they often receive steroids and may have blood-clot problems from antiphospholipid antibodies. Both the disease itself and its treatment can reduce blood flow to the femoral head and increase the chance of bilateral osteonecrosis.Other autoimmune diseases
Autoimmune conditions such as rheumatoid arthritis or inflammatory bowel disease may also increase risk, again because of inflammatory damage, steroid therapy, and pro-thrombotic (clot-forming) states that injure small vessels in the femoral head.Inherited or acquired blood-clotting disorders
Disorders like factor V Leiden mutation, protein C or S deficiency, or antiphospholipid syndrome make blood more likely to clot. Tiny clots can form in the vessels that feed the femoral head, blocking flow and causing areas of bone death.Hyperlipidemia (high blood fats)
High levels of cholesterol and triglycerides can thicken blood, promote atherosclerosis, and increase fat in bone marrow. All of these factors can reduce blood supply in the femoral head and may work together with steroids or alcohol to trigger osteonecrosis.Organ transplantation (especially kidney transplant)
Patients who receive organ transplants often take high-dose steroids and other drugs that affect vessels and bone. Studies in transplant recipients, especially kidney transplant patients, show high rates of femoral head osteonecrosis on imaging.HIV infection and some antiviral drugs
People living with HIV can develop osteonecrosis due to a mix of steroid exposure, lipid disorders, and effects of some antiviral drugs on bone and vessels. As life expectancy improves, AVN of the hip is increasingly recognized in this group.Radiation therapy to the pelvis
Radiation can directly damage bone cells and the small arteries within bone. After pelvic radiotherapy, the femoral head may slowly become weak and sclerotic, and aseptic necrosis can appear months or years later.Chemotherapy and cancer
Some cancer treatments change blood cells, damage vessel walls, or require steroids. Leukemia, lymphoma, and other malignancies are linked with higher risk of femoral head osteonecrosis, especially in young patients.Decompression sickness (“caisson disease”)
Rapid pressure changes, such as in divers or compressed-air workers, can cause nitrogen bubbles to form in blood and bone. These bubbles may block vessels in the femoral head and lead to aseptic bone death.Gaucher disease and other storage diseases
In Gaucher disease, abnormal fat-filled cells build up in bone marrow and can compress small blood vessels. This pressure, plus bone weakness, increases the risk of osteonecrosis in the hip.Chronic kidney disease
Long-term kidney failure and dialysis change mineral metabolism, weaken bone, and often require steroids and immunosuppressants. These factors can promote small-vessel problems and femoral head osteonecrosis.Smoking
Smoking causes blood vessels to narrow and promotes clot formation. Over many years, reduced blood flow and oxygen delivery can make the femoral head more vulnerable to necrosis, especially if other risk factors such as steroids are present.Pancreatitis and metabolic disorders
Conditions like pancreatitis can cause fat particles and inflammatory mediators to circulate in blood and lodge in small vessels. This may contribute to micro-emboli within the femoral head and increase the risk of AVN.Mechanical overload and microtrauma
Repeated heavy loading, high-impact sports, or occupational stress on the hip may injure small vessels or create microfractures within bone. Over time, this may disturb local blood supply and contribute to aseptic necrosis.Idiopathic (unknown cause)
In many patients, no clear cause is found. These “idiopathic” cases may still involve subtle genetic, metabolic, or clotting problems that are not yet well understood, but the final pathway is still reduced blood flow and bone death in the femoral head.
Symptoms
Pain in the groin
The most common symptom is dull or aching pain deep in the groin on the affected side. The pain often starts slowly and becomes worse with walking, standing, or climbing stairs, because these activities load the femoral head.Pain in the thigh
Some patients feel pain in the front of the thigh instead of directly in the groin. This is “referred pain,” where the brain feels hip joint pain as thigh discomfort, especially during activity.Pain in the buttock
In others, the pain is felt in the buttock or back of the hip. This can make sitting and rising from a chair uncomfortable and may be confused with lower back or sacroiliac problems.Pain only with weight-bearing at first
Early in the disease, pain usually appears only when the person stands or walks. As soon as they sit or lie down and take weight off the hip, the pain eases. This pattern shows that the damaged bone is struggling to carry normal loads.Pain at rest or at night
As the disease progresses and the femoral head collapses, pain can occur even at rest or during the night. Patients may wake up with hip pain, which is a sign of more advanced joint damage.Limping (antalgic gait)
Many people develop a limp because they unconsciously shift weight away from the painful hip. The step on the affected side becomes shorter, and walking speed slows because every step hurts.Stiffness and reduced range of motion
The hip gradually becomes stiff. Turning the leg inward (internal rotation) and spreading the legs (abduction) become limited and painful. Doctors often find that these movements are the first to lose range.Difficulty climbing stairs or walking long distances
Tasks that need strong hip movement, such as climbing stairs, walking up a slope, or walking long distances, become difficult. Patients may need to stop often or hold on to a railing because of pain and weakness.Difficulty getting up from a chair or low seat
Standing up from a low chair, car seat, or toilet can cause sharp pain in the hip. Many patients push with their arms or avoid low seating to reduce stress on the femoral head.Feeling of weakness in the leg
The muscles around the hip, especially the gluteal muscles, may weaken because the person avoids using the painful leg. The leg may feel weak or shaky, even though the real problem is joint pain and not pure muscle disease.Reduced ability to work, play sports, or do daily tasks
As pain and stiffness increase, it becomes harder to work, play sports, or do housework. Young adults may notice they cannot run, squat, or lift as before, which strongly affects quality of life.Pain that slowly worsens over months
In most people, symptoms do not appear overnight. Pain usually gets worse slowly over several months or years, which sometimes leads to late diagnosis because the person hopes the pain will go away on its own.Bilateral hip symptoms
Some patients feel pain in both hips, often at different strengths or times. This can make walking very difficult and is especially common in people with lupus, sickle cell disease, or long-term steroid use.Knee pain from hip disease
The brain sometimes “projects” hip pain into the knee. Patients might visit a doctor for knee pain, but examination and imaging reveal that the real problem is necrosis of the femoral head.No symptoms in very early stages
In the earliest phase, there may be no pain at all, even though MRI already shows changes in the bone. This silent stage is why high-risk patients sometimes need imaging before strong symptoms appear.
Diagnostic tests
Doctors use a mix of history, physical examination, lab tests, and imaging to diagnose aseptic necrosis of the femoral head. Imaging, especially MRI, is the most important tool, but physical and lab tests help rule out other causes such as infection, inflammatory arthritis, or nerve disease.
Physical examination tests
Observation of gait (watching the patient walk)
The doctor watches how the person walks in the clinic. A short, painful step on the affected side, slow speed, or use of a stick or crutch suggests hip pain. This simple test shows how much the disease affects daily walking function.Palpation of the hip and groin
The doctor presses gently over the front of the hip, groin, and greater trochanter (the bony bump at the side). Tenderness in these areas supports hip joint disease and helps distinguish it from pain coming from the lower back.Range-of-motion assessment
The hip is moved in different directions—flexion, extension, inward (internal) and outward (external) rotation, and abduction. In AVN, internal rotation and abduction are often limited and painful. Loss of motion in these directions is an important early clue.Limb length comparison
The doctor compares the length of both legs while the patient lies flat. In late stages, collapse of the femoral head and hip arthritis can shorten the affected limb, which may be seen as one leg looking shorter than the other.
Manual tests
FABER (Patrick’s) test
FABER stands for Flexion, ABduction, External Rotation. The patient lies on the back, the ankle of the tested leg is placed on the opposite knee, and the bent knee is gently pushed down. Pain in the groin region during this maneuver suggests hip joint pathology such as AVN.FADIR test
FADIR stands for Flexion, ADduction, Internal Rotation. The hip and knee are bent, the leg is pulled toward the midline and turned inward. This position stresses the front part of the hip. Pain with FADIR can indicate intra-articular problems including early AVN.Log-roll test
The patient lies on the back while the examiner gently rolls the straight leg inward and outward like a log. In a healthy hip, this movement is usually painless. Pain with gentle rolling suggests irritation inside the hip joint, which may be due to AVN or arthritis.Trendelenburg test
The patient stands on the affected leg while lifting the other foot. If the pelvis drops on the lifted side, the test is positive and shows weakness of the hip abductor muscles, often due to chronic hip disease and pain limiting normal use.
Lab and pathological tests
Complete blood count (CBC) and inflammatory markers (ESR, CRP)
CBC, ESR, and CRP are basic blood tests that help rule out infection or active inflammatory arthritis. In pure aseptic necrosis, these values are usually normal, which supports a non-infectious process in the hip.Lipid profile
A fasting lipid profile measures cholesterol and triglyceride levels. High levels may indicate metabolic risk for AVN and guide lifestyle and drug treatment to reduce future vascular problems.Coagulation and thrombophilia tests
Tests for clotting problems (such as protein C and S, factor V Leiden, antiphospholipid antibodies) can uncover a tendency to form clots in small arteries. Finding such disorders explains why AVN developed and may change long-term treatment, for example with anticoagulant drugs.Bone marrow or core biopsy of the femoral head
In rare or unclear cases, a sample of bone from the femoral head can be taken during surgery. Pathology shows dead bone and marrow, with little or no infection. This test is not needed for every patient but confirms necrosis when diagnosis is doubtful.
Electrodiagnostic tests
Nerve conduction studies (NCS)
NCS measure how fast and how strongly electrical signals move along nerves. These tests are not routine for AVN itself, but they help rule out nerve problems like lumbar radiculopathy or peripheral neuropathy when the patient has leg pain or numbness that does not match typical hip joint disease.Electromyography (EMG)
EMG records activity in muscles using small needles. In AVN, EMG is usually normal, but it helps exclude muscle or nerve disorders that could also cause hip area pain or weakness. A normal EMG with continued hip pain makes a joint cause like osteonecrosis more likely.
Imaging tests
Plain X-ray of the hip
X-rays are usually the first imaging test. Early on, they may look normal. Later, they show changes such as areas of sclerosis (whiter bone), cysts, the classic “crescent sign” (a thin line under the joint surface), flattening of the femoral head, and finally hip arthritis.Magnetic resonance imaging (MRI)
MRI is the most sensitive and specific test for early AVN of the femoral head. It can detect bone marrow changes before X-rays change, with sensitivity and specificity above 90% in meta-analyses. Because of this, MRI is considered the gold standard for early diagnosis and staging.Computed tomography (CT) scan
CT uses X-rays and computer processing to create cross-section images. CT is less sensitive than MRI for early disease but gives excellent detail of bone structure. Surgeons use CT to plan operations, especially when collapse, cysts, or deformity of the femoral head are present.Bone scan (including SPECT)
A bone scan involves injecting a small amount of radioactive tracer that goes to areas of active bone turnover. In AVN, early scans may show reduced uptake (“cold spot”) in the necrotic core, sometimes surrounded by a “hot rim.” SPECT (3-D bone scan) can be even more sensitive than MRI in selected groups, such as transplant patients.PET/CT with bone tracers (for research or complex cases)
Positron emission tomography combined with CT can show metabolic activity in bone. Some studies suggest that F-18 PET/CT may predict the risk of femoral head collapse earlier than structural changes are seen on plain MRI, by measuring how active the diseased area is.Ultrasound of the hip (especially in children or effusion)
Ultrasound uses sound waves to look at soft tissues and joint fluid. It cannot see bone necrosis directly, but it can detect fluid in the joint or guide needle procedures. It is sometimes used in children or when infection is suspected along with AVN.
Non-pharmacological treatments
1. Protective weight-bearing with cane or crutches
In early disease, doctors often ask the patient to reduce weight on the affected leg by using a cane, crutches, or a walker. This lowers pressure on the femoral head, which may slow bone collapse and reduce pain while the bone tries to repair itself. Protective weight-bearing does not cure the disease alone, but in early stages it can help delay surgery and improve comfort when combined with medicines or other treatments.
2. Activity modification
Patients are usually advised to avoid high-impact activities such as running, jumping, heavy lifting, and long standing. Instead, they are encouraged to break tasks into shorter periods and rest in between. This reduces repeated stress on the hip and helps protect the weakened femoral head while it remodels. Activity modification can also decrease flare-ups of pain and make daily life easier.
3. Structured physical therapy
A physiotherapist can teach safe exercises to maintain hip range of motion and strengthen muscles around the hip, pelvis, and core. Gentle stretching, isometric exercises, and progressive strengthening help support the joint, reduce stiffness, and improve walking pattern. The goal is to stay active without overloading the damaged bone. Physical therapy is usually adapted to the disease stage and pain level.
4. Aquatic therapy (water exercises)
Exercising in a warm pool allows the body to move with less weight on the hip because water supports much of the body mass. Simple walking, hip swings, and gentle kicking in water can maintain mobility and fitness while causing less pain than land-based exercise. This can help patients stay active and prevent muscle wasting while the bone heals or while waiting for surgery.
5. Use of assistive devices at home
Raised toilet seats, grab bars, high chairs, and shoehorns can reduce deep hip bending and twisting. These simple tools make daily activities like sitting, getting up, and dressing easier and safer. They lower strain on the femoral head and can prevent falls, which are very dangerous when the hip is already fragile.
6. Weight management
Extra body weight increases the load on the hip joint with each step. Losing even a small amount of weight can reduce the forces on the femoral head and may slow the speed of bone collapse. Doctors often recommend a balanced diet and low-impact exercise to reach and keep a healthy weight, which also improves general heart and metabolic health.
7. Smoking cessation
Smoking can damage small blood vessels and reduce blood flow in bone. Quitting smoking may improve circulation to the femoral head and reduce further damage. It also lowers the risk of poor wound healing if surgery becomes necessary and improves overall health and breathing. Support programs, counselling, and nicotine-replacement aids may help people stop smoking.
8. Limiting alcohol intake
Heavy alcohol use is a major risk factor for osteonecrosis because it can affect fat cells in the bone marrow and blood clots in small vessels. Reducing or completely stopping alcohol can help prevent progression in the other hip and improve liver and general health. Doctors often screen for alcohol-related organ damage and provide support for dependence if needed.
9. Careful steroid use (under doctor control)
Long-term or high-dose steroids are a well-known cause of aseptic necrosis. If steroids are needed for another disease, doctors try to use the lowest effective dose for the shortest time and may switch to steroid-sparing medicines. Patients should never stop steroids suddenly on their own; adjustment must be guided by the prescribing doctor.
10. Hyperbaric oxygen therapy (HBOT)
Hyperbaric oxygen therapy involves breathing pure oxygen in a pressurised chamber. This increases the amount of oxygen dissolved in the blood and may improve oxygen delivery to damaged bone. Some studies suggest it can reduce pain and delay progression in early stages, but availability is limited and evidence is still mixed, so it is usually used as an add-on, not a main treatment.
11. Extracorporeal shock wave therapy (ESWT)
ESWT uses focused sound waves applied to the hip region to stimulate healing and blood vessel growth. In osteonecrosis, it may reduce pain and improve function in some early cases. Treatment is usually done in several sessions and can be combined with other conservative measures. Long-term benefits are still being studied.
12. Pulsed electromagnetic field therapy
Low-intensity pulsed electromagnetic fields are applied around the hip with a special device. The goal is to stimulate bone cells and promote bone remodelling. Some reports show pain relief and functional improvement, but evidence is not strong, and it is usually reserved for early disease as a supportive, non-invasive treatment.
13. Traditional medicine and acupuncture (adjunct only)
In some centres, traditional Chinese medicine, herbal formulas, and acupuncture are used along with standard care to reduce pain and improve well-being. These methods may help some patients cope with chronic pain and anxiety, but they do not replace proven medical or surgical treatments. Any herbal product should be discussed with the doctor to avoid drug interactions.
14. Occupational therapy and home safety training
Occupational therapists help patients learn safer ways to perform daily tasks like bathing, cooking, and working. They suggest changes at home or at work to limit hip strain and prevent falls. This training can make patients more independent, confident, and safe while living with a painful hip.
15. Fall-prevention programmes
People with hip pain, weakness, or stiffness have a higher risk of falls. Programmes that include balance exercises, vision checks, medication review, and home hazard removal can lower this risk. Preventing falls is especially important because a fracture in a hip already weakened by osteonecrosis can be very serious.
16. Low-impact aerobic exercise
Activities like cycling on a static bike, gentle walking on flat ground, and swimming keep the heart, lungs, and muscles strong without repeated heavy shock to the hip. Exercise is usually introduced gradually under professional guidance and adjusted if pain increases. Keeping fit also supports weight control and mental health.
17. Psychological counselling and pain-coping strategies
Chronic hip pain and loss of mobility can cause sadness, anxiety, and sleep problems. Psychological support, cognitive-behavioural therapy, and relaxation techniques help patients manage pain better, stick to treatment plans, and maintain social relationships. Good mental health often improves how people feel and function physically.
18. Education and self-management
Educating patients about the disease, risk factors, and treatment options helps them make informed choices. Understanding that early stages may be treated differently from late stages encourages timely follow-up. Written materials, group classes, and online resources can support long-term self-management and realistic expectations.
19. Regular monitoring with imaging
Doctors usually monitor progress with X-rays and sometimes MRI scans. These tests show if the femoral head is stable, improving, or collapsing. Monitoring helps to decide when to change from conservative care to surgical options and prevents avoidable delay in helpful operations.
20. Control of other health problems
Managing conditions like high cholesterol, diabetes, blood-clotting disorders, or autoimmune diseases can reduce further damage to bone blood supply. Doctors often work together (orthopaedic, rheumatology, haematology, endocrine) to control the underlying cause so that both hips and other bones are protected.
Drug treatments
⚠️ Important: All medicines and doses must be chosen and adjusted by a doctor. Many of these uses in aseptic necrosis are off-label, even if the drug is FDA-approved for other bone or pain conditions.
1. Alendronate (Fosamax)
Alendronate is an oral bisphosphonate tablet taken once daily or once weekly for osteoporosis. It reduces bone breakdown by blocking osteoclast cells, helping bone keep its strength. In early osteonecrosis, some studies suggest alendronate may delay femoral head collapse and reduce pain when used for several months. Common side effects include stomach upset, heartburn, and rare oesophageal irritation, so it must be taken with water while upright.
2. Zoledronic acid
Zoledronic acid is an intravenous bisphosphonate given once yearly or at other intervals to treat osteoporosis and some cancers that affect bone. It strongly inhibits bone resorption and improves bone mineral density. In osteonecrosis, it has been explored to support bone strength and reduce collapse risk in early stages. Side effects can include flu-like symptoms after infusion, low calcium, and rare jaw problems (osteonecrosis of the jaw).
3. Risedronate
Risedronate is another oral bisphosphonate used once daily, weekly, or monthly for osteoporosis. Like alendronate, it binds to bone and slows down osteoclast activity. Some small studies use it off-label in osteonecrosis to maintain bone structure around the necrotic area. It may cause gastrointestinal discomfort, so patients are told to follow strict instructions when taking it.
4. Ibandronate
Ibandronate is available as a monthly oral tablet or periodic intravenous injection for osteoporosis. It reduces bone resorption and fracture risk by acting on osteoclasts. In theory, this may support the femoral head in early osteonecrosis, but evidence is limited. Side effects include flu-like reactions, low calcium, and stomach irritation.
5. Celecoxib (Celebrex)
Celecoxib is a COX-2–selective non-steroidal anti-inflammatory drug (NSAID) used for pain and inflammation in arthritis and other conditions. It is usually taken once or twice daily with food. In hip osteonecrosis, it helps reduce pain, making it easier to walk and exercise while other treatments act on the bone. Risks include stomach ulcers, kidney problems, and increased cardiovascular risk in some patients.
6. Ibuprofen
Ibuprofen is a non-selective NSAID taken several times per day for pain. It decreases prostaglandin production, which lowers inflammation and pain around the hip joint. It is often used short-term in osteonecrosis, especially in younger patients. Common side effects are stomach upset, heartburn, and with long-term use, risk of ulcers, kidney issues, or raised blood pressure.
7. Naproxen
Naproxen is another NSAID with a longer action, often dosed twice daily. It provides sustained pain relief, which can help patients follow physical therapy and weight-bearing advice. Like other NSAIDs, it may cause gastrointestinal bleeding, kidney problems, and cardiovascular risk, so dose and duration must be carefully monitored.
8. Diclofenac
Diclofenac is a prescription NSAID available in tablets, capsules, and topical gels. Taken two to three times daily, it reduces inflammation in and around the hip. It can be useful for short-term control of flare-ups but shares the same risks of ulcers, liver enzyme elevation, and cardiovascular events, especially in older patients or those with heart disease.
9. Acetaminophen (paracetamol)
Acetaminophen is an analgesic and antipyretic that helps relieve mild to moderate pain but has little anti-inflammatory effect. It is often used as a first-line medicine or in combination with NSAIDs to reduce total NSAID dose. It is generally gentler on the stomach but can damage the liver if taken in high doses or with alcohol.
10. Tramadol
Tramadol is a centrally acting opioid-like pain medicine used for moderate to severe pain. It can be prescribed when NSAIDs alone are not enough. It works by acting on opioid receptors and neurotransmitters in the brain to reduce pain perception. Side effects include nausea, dizziness, constipation, sleepiness, and risk of dependence or withdrawal if misused.
11. Tramadol–celecoxib combination (Seglentis)
This combination tablet contains tramadol and celecoxib and is approved for short-term management of acute pain severe enough to require an opioid. It offers both anti-inflammatory and stronger analgesic effects in a single pill. It may be used briefly after procedures like core decompression. Risks include opioid-related problems (addiction, respiratory depression) and NSAID-related issues, so careful selection and monitoring are essential.
12. Low-dose aspirin
Low-dose aspirin inhibits platelets and reduces blood clot formation. In some patients with clotting disorders or steroid-related osteonecrosis, doctors may use it off-label to improve microcirculation in bone and prevent new lesions, although evidence is limited. Side effects include stomach irritation, bleeding risk, and interactions with other anticoagulants.
13. Low-molecular-weight heparin (e.g., enoxaparin)
These injectable anticoagulants thin the blood by enhancing antithrombin activity. In selected patients with strong clotting tendencies, they may be used short term to improve blood flow to the femoral head, although this is off-label. Main risks are bleeding, bruising at injection sites, and rare low platelet counts.
14. Statins (e.g., atorvastatin)
Statins lower blood cholesterol and improve endothelial function. Some studies suggest they may reduce risk of steroid-induced osteonecrosis and support better blood flow in bone. They are mainly used to treat high cholesterol but may indirectly help hip health. Side effects include muscle pain, abnormal liver tests, and rare severe muscle breakdown.
15. Vasodilators (e.g., iloprost)
Iloprost is a prostacyclin analogue that dilates small blood vessels and inhibits platelet aggregation. In osteonecrosis, it has been studied to improve microcirculation and relieve pain in early stages. Treatment is usually given as intravenous infusions over several days. Side effects include flushing, headache, low blood pressure, and jaw pain.
16. Teriparatide injection (FORTEO and similar)
Teriparatide is a synthetic parathyroid hormone fragment given as a daily subcutaneous injection to build new bone in severe osteoporosis. It stimulates osteoblasts (bone-forming cells) more than osteoclasts. Some doctors explore it off-label for osteonecrosis to enhance bone repair after decompression. Side effects include nausea, dizziness, leg cramps, and potential concerns about long-term bone tumours, so duration is limited.
17. Romosozumab (Evenity)
Romosozumab is a monoclonal antibody that increases bone formation and decreases bone resorption, used for severe osteoporosis in high-risk patients. It is given as monthly injections for a limited number of doses. In theory, it could support bone rebuilding around necrotic areas, but this is experimental. There is a warning for increased risk of heart attack and stroke, so careful selection is required.
18. Vitamin D (high-dose prescription forms)
Prescription vitamin D is used when blood vitamin D levels are very low. It improves calcium absorption and supports bone mineralisation. In osteonecrosis, correcting deficiency is basic care to support all other bone treatments. High doses can lead to high blood calcium, kidney stones, and confusion if misused, so monitoring is important.
19. Proton pump inhibitors (with NSAIDs)
Drugs like omeprazole reduce stomach acid and are sometimes added when strong NSAIDs are needed, to protect the stomach from ulcers and bleeding. They do not treat osteonecrosis directly but make pain control safer. Long-term use may affect mineral absorption and increase infection risk, so they should be used at the lowest effective dose.
20. Short-term strong opioids (e.g., oxycodone)
In very severe pain or after major surgery, short-term strong opioids can be used. They act on opioid receptors to reduce pain perception. They do not heal the bone and should be used for the shortest possible time. Risks include constipation, drowsiness, breathing suppression, dependence, and overdose if misused.
Dietary molecular supplements
These are supportive, not cures. Always ask your doctor before starting any supplement, especially if you take other medicines.
1. Vitamin D3 (cholecalciferol)
Vitamin D3 helps the gut absorb calcium and phosphate, which are needed for strong bone. Correcting deficiency improves bone mineral density and supports healing after surgery or decompression. Typical maintenance doses are small daily or weekly tablets, adjusted by blood tests. Too much vitamin D can cause high calcium, nausea, and kidney problems, so levels must be checked regularly.
2. Calcium supplements
If dietary calcium is low, tablets or chewable forms may be recommended. Calcium provides the basic mineral for bone hardness. Supplements work best together with vitamin D and weight-bearing activity. Excess calcium can cause constipation, kidney stones, and may interact with some medicines like bisphosphonates and thyroid tablets.
3. Vitamin K2 (menaquinone)
Vitamin K2 helps activate proteins that move calcium into bone and keep it out of blood vessel walls. Some studies suggest it may modestly improve bone strength when combined with vitamin D and calcium. It is usually taken as a daily capsule. Potential issues include interaction with blood thinners like warfarin, so clotting status must be checked.
4. Omega-3 fatty acids (fish oil)
Omega-3s have anti-inflammatory effects and may reduce joint pain and stiffness. They also support heart and blood vessel health, which is important in a disease caused by poor bone blood flow. Common doses are 1–3 g/day of EPA/DHA, but higher doses can increase bleeding risk and cause fishy aftertaste or stomach upset.
5. Curcumin (from turmeric)
Curcumin is a plant compound with anti-inflammatory and antioxidant properties. In joint disease, it may reduce pain and inflammatory markers, though evidence is modest. Because it has poor absorption, many products use enhanced formulations. High doses can cause digestive upset and may interact with blood thinners.
6. Resveratrol
Resveratrol is a polyphenol found in grapes and berries with antioxidant and potential micro-circulation benefits. Experimental studies suggest it may protect bone cells under stress and reduce inflammation. Oral supplements vary widely in dose and quality. Side effects are usually mild but can include digestive problems and drug interactions.
7. Coenzyme Q10 (CoQ10)
CoQ10 helps mitochondria produce energy and acts as an antioxidant. It may support muscle function and vascular health, which can help people stay active with less fatigue. Doses often range from 100–300 mg/day. Side effects are usually mild, like nausea or insomnia, but it may interact with blood pressure and blood-thinning medicines.
8. Collagen peptides
Hydrolysed collagen provides amino acids needed to build cartilage and other connective tissues. Some studies show small improvements in joint pain and function with regular use. It is often taken as a powder mixed with drinks. Side effects are rare but can include fullness or bad taste.
9. Glucosamine and chondroitin
These supplements are building blocks of cartilage. They are widely used in osteoarthritis and may reduce pain and improve function in some people, though results are mixed. They are usually taken daily for several months before judging benefit. Side effects include stomach upset and possible interactions with blood thinners.
10. Antioxidant multivitamins (vitamin C, vitamin E, selenium)
Oxidative stress can damage blood vessels and bone cells. Adequate intake of antioxidant vitamins and trace elements helps support normal healing and immune function. However, very high doses can be harmful, so balanced formulations at recommended daily allowances are preferred.
Immune-booster, regenerative and stem-cell-related drugs
Many of these are specialist or experimental therapies and are not routine care everywhere.
1. Teriparatide (bone-forming hormone therapy)
Teriparatide is a daily injection that strongly stimulates new bone formation and improves bone structure in severe osteoporosis. Because it activates osteoblasts, some doctors use it off-label to support healing after core decompression or fractures in osteonecrosis. Treatment duration is usually limited to around two years because of safety rules. Calcium and vitamin D are given alongside, and patients are monitored for high calcium and other side effects.
2. Romosozumab (sclerostin-inhibiting antibody)
Romosozumab blocks sclerostin, a protein that slows bone building. By removing this brake, it increases bone formation and decreases bone resorption. It is approved for high-risk osteoporosis and given as monthly injections over a short course. In theory, it might help remodel the femoral head, but data in osteonecrosis are limited and cardiovascular risks must be weighed very carefully.
3. Bone marrow aspirate concentrate (BMAC) with mesenchymal stem cells
In this procedure, bone marrow is taken (often from the pelvis), concentrated, and injected into the femoral head, usually after core decompression. It brings mesenchymal stem cells that can support new bone and blood vessel growth. This is considered a regenerative surgical adjunct rather than a simple injection. Studies show improved pain and hip survival in some early-stage patients.
4. Platelet-rich plasma (PRP)
PRP is made by spinning a patient’s blood to concentrate platelets and growth factors, then injecting them into the affected hip during surgery or as an adjunct. The goal is to stimulate tissue repair and reduce inflammation. Evidence in osteonecrosis is still emerging and mixed, but it appears relatively safe because it uses the patient’s own blood.
5. Hyaluronic acid intra-articular injections
Hyaluronic acid is a gel-like substance injected into joints to improve lubrication and shock absorption. In osteonecrosis, it may reduce pain and improve movement temporarily, especially if there is also early osteoarthritis. It does not reverse bone death but may delay the need for stronger pain medicines. Mild injection-site pain or swelling can occur.
6. Experimental cell-based and gene therapies
Research is exploring engineered stem cells, gene delivery systems that promote bone growth, and tissue-engineered scaffolds placed into the femoral head. These aim to regenerate a stronger, better-vascularised bone. At present, such therapies are mostly done in clinical trials or specialised centres, and long-term safety and benefit are still under study.
Surgeries for aseptic necrosis of the femoral head
1. Core decompression
Core decompression involves drilling one or more channels into the necrotic area of the femoral head. This reduces pressure inside the bone, improves blood flow, and can relieve pain. It is usually used in early stages before the femoral head collapses and can be combined with bone grafts or biologic agents. Recovery includes partial weight-bearing and physiotherapy.
2. Core decompression with bone grafting
In this procedure, after drilling, the surgeon fills the tunnel with bone graft (from the patient or donor) or synthetic bone substitute. The graft provides mechanical support and a scaffold for new bone growth. This approach may better maintain the shape of the femoral head compared with decompression alone, especially in medium-sized lesions.
3. Vascularised fibular grafting (free vascularised fibula)
Here, a segment of the patient’s fibula (small lower-leg bone) is transferred to the femoral head along with its blood vessels, which are reconnected microsurgically. This brings living bone and a new blood supply to the necrotic area. It is a complex operation but can provide long-term hip preservation in selected younger patients.
4. Rotational or realignment osteotomy
The surgeon cuts and rotates the upper femur so that a healthier part of the femoral head bears most of the weight, moving the necrotic area away from the main load zone. This joint-preserving surgery is technically demanding and best suited for specific lesion locations and younger patients without advanced arthritis.
5. Total hip arthroplasty (total hip replacement)
When the femoral head has collapsed and arthritis is advanced, total hip replacement is often the most reliable option. The damaged femoral head and socket are removed and replaced with artificial components made of metal, ceramic, and plastic. This can give excellent pain relief and function, but the artificial joint has a limited lifespan, which is important in younger patients.
Prevention tips
Avoid unnecessary high-dose or long-term steroid use; always discuss alternatives and taper plans with your doctor.
Limit alcohol intake and seek help for dependence, because heavy alcohol is a strong risk factor.
Stop smoking to improve blood flow to bones and lower surgical complication risks.
Manage cholesterol, blood pressure, and diabetes to protect small blood vessels that feed the femoral head.
Wear seat belts and protective gear to reduce hip injuries from accidents and sports.
Maintain a healthy body weight to reduce mechanical stress on the hip joint.
Stay active with low-impact exercise to keep muscles strong and joint flexible without overloading the hip.
Have regular follow-up if you take steroids, have blood diseases, or have had trauma to the hip.
Treat underlying clotting or autoimmune disorders early to reduce repeated bone blood-supply problems.
Follow post-surgery instructions carefully (weight-bearing limits, physiotherapy, medicines) to protect the operated hip and prevent failure.
When to see a doctor
You should see a doctor as soon as possible if you have deep groin, buttock, or thigh pain that worsens when you stand, walk, climb stairs, or rotate your leg, especially if you have risk factors like steroid use, heavy alcohol intake, sickle cell disease, or recent hip injury. Early imaging (X-ray and MRI) can detect osteonecrosis before collapse, when joint-preserving treatments work best. Seek urgent care if pain suddenly becomes severe, you cannot bear weight, the leg feels unstable, or you develop fever, redness, or trauma – these may signal fracture, acute collapse, or infection that needs emergency treatment. Ongoing patients should return to clinic if pain increases, walking distance falls, or new hips or joints become painful.
What to eat and what to avoid
Eat: calcium-rich foods (milk, yoghurt, cheese, fortified plant milks) to support bone strength.
Eat: foods high in vitamin D (fatty fish, fortified dairy/plant milks, eggs) if allowed, plus safe sun exposure.
Eat: lean proteins (fish, poultry, beans, lentils) to help tissue repair after surgery or micro-fractures.
Eat: colourful fruits and vegetables for antioxidants that support blood vessels and immunity.
Eat: whole grains and healthy fats (olive oil, nuts, seeds) for heart and vessel health.
Avoid: heavy alcohol, which damages bone blood supply and liver.
Avoid: smoking and exposure to second-hand smoke.
Avoid: very salty, sugary, or ultra-processed foods that worsen blood pressure, diabetes, and weight.
Avoid: excessive caffeine and cola-type drinks, which may affect calcium balance if taken in large amounts.
Avoid: fad diets that cut major food groups without medical guidance; they may weaken bone and muscle.
Frequently asked questions (FAQs)
1. Is aseptic necrosis of the femoral head the same as avascular necrosis?
Yes. “Aseptic necrosis,” “avascular necrosis,” and “osteonecrosis” of the femoral head all describe bone death in the hip due to poor blood supply without infection. Different doctors may use different names, but the core problem is the same.
2. Can the bone completely heal once it is necrotic?
In very early stages, if blood flow is improved and pressure is reduced, part of the necrotic area may remodel and strengthen again. However, if the femoral head has already collapsed, full return to normal shape is unlikely and surgery is often needed.
3. Which stage of the disease can be treated without surgery?
Non-operative treatment is usually considered for early stages where the femoral head shape is still preserved on X-ray and MRI. As soon as cracks or collapse appear, joint-preserving surgery or hip replacement is more often recommended.
4. Is core decompression always successful?
Core decompression works best for small to medium lesions in early stages. Even then, some patients still progress to collapse and may later need hip replacement. Results depend on age, lesion size, cause, and whether biologics or grafts are added.
5. How long must I use crutches after core decompression?
This varies by surgeon and lesion size, but many protocols suggest partial or toe-touch weight-bearing for several weeks, then gradual increase over 2–3 months. Your surgeon and physiotherapist will give an individual plan.
6. Do bisphosphonates cure osteonecrosis?
No. Bisphosphonates like alendronate may slow bone collapse and reduce pain, especially in early disease, but they do not fully reverse necrosis or guarantee avoidance of surgery. They are one part of a combined strategy with weight-bearing control and, sometimes, decompression.
7. Are there serious risks with bisphosphonates?
Serious problems are rare but include jaw osteonecrosis and atypical femur fractures after long-term use, especially in cancer patients on high-dose IV forms. More common side effects are stomach upset and bone or joint pain. Doctors carefully review risks and benefits before starting therapy.
8. Will I definitely need a hip replacement?
Not everyone needs a hip replacement. Some patients, especially with small early lesions, do well with conservative care or joint-preserving surgery. However, many cases eventually progress, and up to a large proportion of advanced hips require replacement to control pain and restore function.
9. How long does a hip replacement last in young patients?
Modern hip replacements can last 15–20 years or more, but younger, more active patients may wear them out sooner. If the implant loosens or wears, revision surgery may be required. Careful activity choices and weight control can help the prosthesis last longer.
10. Can I continue sports after treatment?
Low-impact sports like swimming, cycling, and careful walking are usually encouraged once healing is stable. High-impact sports (running, jumping, contact sports) may be restricted, especially after surgery or in advanced disease, to protect the femoral head or implant. Your doctor will guide you based on imaging and symptoms.
11. Does diet alone fix osteonecrosis?
No. Diet can support bone and blood vessel health but cannot restore lost blood supply or reverse structural bone damage. Medical evaluation, imaging, and appropriate therapies (non-pharmacological, drugs, or surgery) are essential.
12. Is osteonecrosis always caused by steroids or alcohol?
No. While steroids and alcohol are major causes, many other factors can lead to osteonecrosis, including trauma, sickle cell disease, autoimmune diseases, clotting disorders, and sometimes unknown causes (idiopathic). Often, more than one risk factor is present.
13. Can both hips be affected?
Yes. Bilateral involvement is common, especially in steroid-related and idiopathic cases. That is why doctors often image both hips, even if symptoms start on one side. Early detection on the opposite side can allow earlier treatment.
14. Is aseptic necrosis contagious or inherited?
It is not contagious. Some underlying conditions that raise risk (such as clotting disorders or sickle cell disease) can have genetic components, but the bone necrosis itself is not passed on directly like an infection. Lifestyle and medication factors also play important roles.
15. What is the most important thing I can do today?
The most important step is to get a proper diagnosis and staging with an orthopaedic specialist, follow their advice on weight-bearing and medicines, and control modifiable risks like steroids, alcohol, smoking, weight, and other health problems. Early, organised care gives the best chance to preserve the hip and stay active.
Disclaimer: Each person’s journey is unique, treatment plan, life style, food habit, hormonal condition, immune system, chronic disease condition, geological location, weather and previous medical history is also unique. So always seek the best advice from a qualified medical professional or health care provider before trying any treatments to ensure to find out the best plan for you. This guide is for general information and educational purposes only. Regular check-ups and awareness can help to manage and prevent complications associated with these diseases conditions. If you or someone are suffering from this disease condition bookmark this website or share with someone who might find it useful! Boost your knowledge and stay ahead in your health journey. We always try to ensure that the content is regularly updated to reflect the latest medical research and treatment options. Thank you for giving your valuable time to read the article.
The article is written by Team RxHarun and reviewed by the Rx Editorial Board Members
Last Updated: February 09, 2025.
