The “Cancer That Won’t Kill You” Is Stealing People’s Hips

In the clinic, a 45-year-old man rolled up his pant leg. The pain was in his groin. It had been three months. He thought it was a herniated disc. He tried ointment and massage. Neither helped. Putting on socks had become hard. He had to lift his leg onto the bed, twist his body, and pull the sock on. The X-ray looked fine. The doctor ordered an MRI of the hip. The image showed a dark band in the femoral head.

He asked, “The bone is not broken. How can it die?”

That question gets to the center of the problem. Many cases of femoral head necrosis are not crushed to death. They are starved. Bone cells deep in the femoral head need blood. When blood supply is cut, blocked, or squeezed shut, bone goes through hypoxia, cell death, repair, and collapse. The disease does not kill directly. It can make squatting, walking far, and putting on socks impossible. That is why people call it a cancer that will not kill you.

What raises the risk? Two groups: traumatic and nontraumatic. In nontraumatic cases, glucocorticoids and long-term heavy alcohol use are the two leading factors. Orthopedic reviews often put them together at about 90% of nontraumatic cases.

1. Trauma: One Fracture Can Plant a Problem for Years

The clearest trigger is hip trauma.

Femoral neck fracture is the most common. The femoral neck is the narrow part below the femoral head that connects to the shaft. The main vessels that supply the femoral head run along its surface. They include the medial circumflex femoral artery and its retinacular branches. When the fracture displaces, these vessels can tear, twist, or compress. Blood supply to the femoral head stops.

The problem is that the fracture can heal while the femoral head stays at risk. A patient has internal fixation. Follow-up shows the fracture line blurring. The doctor says bone density in the femoral head is uneven and wants to keep watching. Months or years after injury, necrosis may appear. After a femoral neck fracture, a healed fracture does not mean a safe femoral head. Follow-up is not a formality.

Hip dislocation and acetabular fracture can also injure these vessels. If a dislocation is not reduced quickly, or if reduction damages the vessels, risk rises. Femoral head fracture is less common. When it happens, local blood supply can be disrupted.

The key point with trauma: at the time of injury, everyone watches the fracture. Later, the question is whether blood supply to the femoral head has recovered.

2. Steroids: The Leading Drug Factor, and Often Misunderstood

Among nontraumatic causes, glucocorticoids rank first.

Doctors use them for systemic lupus erythematosus, rheumatoid arthritis, nephrotic syndrome, asthma, severe allergy, and anti-rejection after organ transplant. They control inflammation and can save lives. They can also raise the risk of femoral head necrosis. Risk depends on dose, duration, route, and individual susceptibility. Long-term high-dose use carries higher risk. High-dose intravenous pulse therapy may also raise risk. Individual differences are large. Some people develop problems after short-term use. Others use steroids for a long time and do not.

Steroids cause damage in several ways. They can disturb fat metabolism, form fat emboli, and block small vessels in the femoral head. They can make marrow fat cells grow, raise pressure inside the bone, and compress vessels. They can injure blood vessel lining, push blood toward clotting, and weaken bone repair. In plain terms, they block vessels and make bone harder to repair.

One patient with systemic lupus erythematosus was stable after steroid pulse therapy. Three months later, she felt aching in her groin. At first it hurt only after long walks. Later it hurt while sitting. She thought it was fatigue. MRI showed a necrotic area in one femoral head. She had no trauma and no drinking history. Steroids were the trigger. Her underlying disease meant she could not simply stop them.

Here is the line to hold: people on steroids should not stop or reduce them on their own because they fear femoral head necrosis. Abrupt withdrawal can make the underlying disease flare. That can be worse. The right approach is to use the smallest effective dose and the shortest necessary course under a doctor’s care, while watching for hip symptoms.

3. Alcohol: The Second Leading Cause, a Blockage You Drink Into Yourself

Long-term heavy alcohol use is another major trigger.

Alcohol affects fat metabolism. It can cause high lipids and fatty liver. That raises the risk of fat embolism and small vessel blockage. It can also narrow blood vessels, push blood toward clotting, and disturb bone metabolism. Once small vessels in the femoral head are blocked, bone tissue loses oxygen.

Research generally links daily drinking, long-term drinking, and heavy intermittent drinking to higher risk. A man drank about 250 milliliters of strong liquor every day for ten years. His hip began to hurt. X-ray did not show much. MRI found abnormal signal in the femoral head. He did not think drinking had anything to do with leg pain. Blood vessels do not work that way.

Alcohol and steroids sometimes stack. A patient with autoimmune disease may need long-term steroids and also drink heavily. Risk can rise further.

4. Other Factors: Smoking, Obesity, Decompression Sickness, Blood Diseases, Radiotherapy, Transplant

Other factors also raise risk.

Smoking narrows blood vessels. Carbon monoxide lowers oxygen carrying capacity. Long-term smoking can injure vessel lining and promote clots. Some studies show current smokers have a higher risk of femoral head necrosis than nonsmokers. In people already diagnosed, smoking also affects the results of hip-preserving surgery.

Being overweight or doing long-term heavy labor puts more stress on the hip. Repeated mechanical load can cause bone marrow edema. Higher pressure inside the bone then compresses small vessels. This creates a cycle: ischemia, edema, higher pressure, more ischemia.

Divers, tunnel workers, and high-pressure workers who decompress too quickly can form nitrogen bubbles in blood and tissue. Bubbles block vessels and can cause decompression-related bone necrosis. These jobs require strict decompression rules.

Radiotherapy to the pelvis or hip can damage bone and vessels and raise risk. Blood diseases such as sickle cell anemia, antiphospholipid syndrome, and thrombophilia can cause bone infarction through clots or vessel blockage. Metabolic problems such as Gaucher disease, pancreatitis, and hyperlipidemia may also play a role. People on long-term steroids and immunosuppressants after organ transplant are at higher risk.

Some patients have no clear trigger. This is called idiopathic femoral head necrosis. This suggests that beyond known factors, there may be genetic susceptibility, microcirculation problems, clotting tendencies, and other causes not fully understood.

5. Who Needs to Be More Alert?

Some groups should not dismiss hip discomfort as a disc problem or fatigue.

These include people on long-term or high-dose glucocorticoids, especially those with lupus, kidney disease, or a transplant history. They include people who drink daily or heavily over the long term. They include people with a history of femoral neck fracture, hip dislocation, or acetabular fracture. They include divers and high-pressure workers. They include people with blood diseases such as sickle cell anemia, antiphospholipid syndrome, or thrombophilia. They include long-term smokers, people with obesity, and heavy manual workers. They include people who have had pelvic radiotherapy or organ transplant.

If these people develop aching in the groin, buttock, or inner thigh, or notice that hip rotation or abduction is less flexible than before, they should see an orthopedic doctor early.

6. Early Signs: Do Not Treat Hip Pain as Something to Endure

Early femoral head necrosis may have no obvious symptoms. It may only cause groin aching. Pain worsens with weight-bearing, walking, and stairs. It eases with rest. As it progresses, pain may become constant. It can wake a patient at night.

Limited motion is another sign. Putting on socks, cutting toenails, and squatting become difficult. Some people unconsciously swing the knee outward when squatting. Some begin to limp. Pain may radiate to the knee and be misdiagnosed as knee disease or lumbar disc herniation.

X-ray may be normal early and easy to miss. MRI is sensitive for early diagnosis. It can detect marrow edema and necrotic areas before X-ray changes. For high-risk people with unexplained hip pain, MRI is often more useful than X-ray.

Treatment depends on stage, age, extent of necrosis, and patient needs. Early stages may be treated with hip-preserving procedures such as core decompression and bone grafting. When collapse is advanced, total hip arthroplasty may be the best way to restore walking. The earlier the disease is found, the greater the chance of preserving the hip.

7. Prevention: Keep Risk Outside the Door

Use steroids rationally. When steroid treatment is needed, follow medical advice for the smallest effective dose and shortest course. Do not increase or stop on your own. Long-term users should have bone health checked regularly.

Limit or stop alcohol. This matters most for people with hip pain, trauma history, or steroid use.

Stop smoking. Smoking harms blood vessels throughout the body.

Control weight and avoid chronic overload of the hip. Heavy laborers should use protective measures.

After hip trauma, get proper treatment and follow-up. Patients with femoral neck fracture or hip dislocation should have regular check-ups as advised, including MRI when necessary, even if the fracture has healed.

Divers and high-pressure workers must follow decompression rules strictly.

High-risk groups should seek screening actively. If hip symptoms appear, get checked early instead of waiting until walking is difficult.

Conclusion

If your hip hurts for two weeks, do not rush to buy ointment. Make an orthopedic appointment. Describe the symptoms clearly. Does the groin hurt? Is putting on socks hard? Which leg gets stuck first when squatting? If MRI is needed, get it. Put the images in your medical file. Schedule the next follow-up.

The femoral head is not worn out by age alone. Sometimes it is starved of blood. The earlier it is found, the better the chance of saving the hip and keeping the ability to walk.

This article is for general information. It does not replace professional medical advice. For specific medication, tests, and treatment, consult an orthopedic or relevant specialist.