If you have ever received a cortisone shot to get through a season, or you take steroids long term for an autoimmune condition, there is a hip complication you have probably never been warned about. It is called corticosteroid induced osteonecrosis of the femoral head, and despite decades of peer reviewed research documenting it, most patients only learn about it after the damage is already done.

This condition is not rare, not theoretical, and not something to shrug off as "just a possible side effect." Here is what the medical literature actually says, who is most at risk, and what you can do before your hip reaches the point of no return.

Episode Video

What Is Osteonecrosis of the Femoral Head?

Osteonecrosis of the femoral head means that part of the bone forming the ball of your hip joint has died. It happens when the small blood vessels feeding that bone become compromised. Once bone loses its blood supply, it loses strength, and once it loses enough strength, the smooth round shape of the femoral head can collapse inward.

When that collapse happens, the joint no longer functions properly. The cartilage above the damaged bone breaks down quickly, pain becomes severe, and a total hip replacement often becomes the only remaining option.

According to the peer reviewed literature, 70 to 90 percent of untreated cases progress to full collapse within five years. That is not a worst case scenario. That is the typical outcome without early intervention.

How Corticosteroids Cause Hip Bone Death

The link between corticosteroids and femoral head osteonecrosis was first documented in 1957, and it has been confirmed repeatedly in the decades since. Steroids work by suppressing inflammation, but the same mechanism that calms inflammation can also impair the body's ability to repair and maintain healthy bone tissue over time.

The Dose Is Smaller Than You Think

Most people assume this only happens to patients on high dose steroids for serious illness, but the research tells a different story. Oral doses as low as 290 milligrams of prednisone, taken over as little as six days, have been linked to the development of osteonecrosis.

To put that in perspective, a standard epidural steroid injection is often around 80 milligrams. Three injections in a year adds up to 240 milligrams, just short of that threshold. Add a second year of injections, or a series of smaller 60 milligram knee injections given four times, and the cumulative exposure crosses that same line. Athletes receiving repeated cortisone shots over multiple years, even for different joints, can be accumulating risk without realizing it.

When corticosteroid induced osteonecrosis does develop, it tends to show up fast, often within 12 months of starting steroid therapy, and it affects both hips in roughly 70 percent of cases.

Who Is Most at Risk?

Two groups face the highest exposure to this condition, and each faces a very different set of choices.

• Athletes receiving repeated cortisone injections. For this group, steroid exposure is often elective and modifiable. Every future injection is a decision, not an automatic next step, and it is worth asking what alternatives exist before agreeing to another shot.

• Patients on long term corticosteroids for chronic conditions. This includes people managing lupus, multiple sclerosis, Crohn's disease, nephrotic syndrome, or recovering from a solid organ transplant (kidney, liver, or heart). These patients often cannot simply stop their medication, since their underlying condition requires ongoing suppression. For this group, the priority is not avoiding steroids altogether, it is early detection and prompt action before collapse occurs.

The 30 Year Study That Changes the Conversation

In 2018, orthopedic researcher Dr. Philippe Hernigou and colleagues published a landmark study in the journal International Orthopedics, following 125 adult patients with corticosteroid induced osteonecrosis in both hips for up to 30 years.

Because both hips were affected at the same early stage in each patient, researchers could compare two treatments side by side in the same person. One hip received standard core decompression surgery alone. The other hip received a bone marrow concentrate injection into the femoral head.

The results were striking:

• Hips treated with core decompression alone: 72 percent collapsed, and 76 percent eventually required a total hip replacement.

• Hips treated with bone marrow concentrate: only 28 percent collapsed, and 24 percent required a total hip replacement.

• Patients whose hips did not collapse saw the area of bone affected by osteonecrosis shrink from about 45 percent before treatment to just 12 percent at final follow up.

That is a 30 year outcome difference driven entirely by early diagnosis and biological treatment, not luck.

Why MRI Is the Key to Catching It Early

The Hernigou study only worked because those patients were diagnosed and treated before their hips collapsed. Once collapse occurs, no regenerative treatment can reverse it, and a hip replacement becomes the only path forward.

MRI is the gold standard for detecting early osteonecrosis because it picks up changes long before they would ever show up on an X-ray. If you have known risk factors and you start experiencing hip or groin pain, an MRI, not just an X-ray, should be part of your workup.

What To Do If You're at Risk

• If you are on chronic corticosteroid therapy and develop hip or groin pain, ask for an MRI rather than waiting on X-ray results.

• If you are an athlete considering another cortisone injection, ask your doctor what alternatives exist first.

• If you are diagnosed with early stage osteonecrosis, ask about biologic treatment options with long term evidence behind them rather than a "watch and wait" approach.

Remember that this is frequently a bilateral condition, meaning if one hip is affected, the other should be evaluated too.

Final Thoughts

Steroid injections and long term corticosteroid therapy are not automatically dangerous, but they are not automatically safe either. The peer reviewed evidence shows that timing, awareness, and early imaging can be the difference between preserving your natural hip for decades and facing a hip replacement at a much younger age than expected. If any of this sounds familiar, whether you're an athlete who's lost count of your cortisone shots or you're managing a chronic condition, it is worth listening to the full episode for the complete breakdown. Subscribe to the podcast so you don't miss the follow up episodes building on this topic.

Frequently Asked Questions

1. Should I be worried after just one or two cortisone shots?
   One or two isolated injections carry far less cumulative risk than repeated shots over months or years, but it is still worth discussing your total steroid exposure with your doctor.

2. How do I know if I have osteonecrosis before it becomes serious?
   The only reliable way to catch it early is through an MRI, since this condition often does not show up on a standard X-ray until significant damage has already occurred.

3. Can osteonecrosis of the femoral head be reversed once it starts?
   It can potentially be treated and stabilized if caught before the bone collapses, but once collapse occurs, the damage cannot be reversed.

4. What if I need corticosteroids for a chronic condition like lupus or a transplant?
   You likely cannot stop the medication, so the priority shifts to regular monitoring and early imaging so any bone changes are caught before they progress.

5. Is a hip replacement my only option if I'm diagnosed early?
   No, research shows that early stage disease treated with biologic options like bone marrow concentrate can significantly reduce the odds of ever needing a replacement.

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