Avascular Necrosis of the Hip: What It Is, Why It Happens, and What to Do About It

Of all the hip conditions I treat, Avascular Necrosis Hip Treatment Chandigarh is the one that causes the most unnecessary delay — and therefore the most unnecessary suffering.

I say unnecessary because AVN is often caught late, not because it hides well, but because it is regularly misdiagnosed or dismissed as muscle strain in its early stages. early stages By the time many patients reach me, the femoral head — the ball part of the ball-and-socket hip joint — has already collapsed. What could have been a bone-preserving procedure has become a joint replacement. joint replacement

This doesn’t have to happen. The condition is predictable, stageable, and when caught early, sometimes treatable without a full replacement. The key is knowing what to look for.

What Avascular Necrosis Actually Means

The name says everything. Avascular: without blood supply. Necrosis: death of tissue. Avascular necrosis — also called osteonecrosis — occurs when the blood supply to the femoral head is cut off. Without blood, the bone cells die. Over weeks and months, the structural integrity of the bone breaks down. Eventually, the spherical head of the femur collapses inward, destroying the smooth articulation of the hip joint.

It can happen in one hip or both. Bilateral AVN — affecting both hips simultaneously — is not rare, and both should be investigated when one is diagnosed.

What Causes It? The Common Culprits

In my practice, I see four main causes of AVN, in roughly this order of frequency:

Long-term steroid use. This is the most common cause I see in Chandigarh and Punjab. Corticosteroids — prescribed for autoimmune conditions, kidney disease, skin conditions, and commonly in traditional medicine preparations — are a well-established cause of osteonecrosis. Even a relatively short course of high-dose steroids can trigger it in susceptible individuals. Patients on long-term steroids should have annual hip X-rays as a precaution.

Excessive alcohol consumption. Alcohol affects fat metabolism and causes fat emboli that block the small vessels supplying the femoral head. This is the second most common cause I encounter. It’s worth noting that the amount of alcohol needed isn’t extreme — chronic heavy drinking over several years is the typical pattern.

Hip trauma. A hip fracture or dislocation can directly damage the blood vessels to the femoral head. This is why post-traumatic AVN is closely monitored after significant hip injuries, particularly in young patients.

Idiopathic. A frustrating but real category — no identifiable cause. We find it, we treat it, but we can’t always explain why it happened. These patients often present in their 30s and 40s, otherwise healthy.

Other causes include sickle cell disease, lupus, Gaucher’s disease, and decompression sickness — less common, but worth knowing.

The Four Stages — and Why They Change Everything

AVN is staged from I to IV. Stage determines treatment.

Stage I and II: The femoral head is still spherical. The bone is dying internally but the structure hasn’t collapsed yet. On a plain X-ray, Stage I may appear completely normal — which is why X-ray alone is insufficient for diagnosis. MRI is the gold standard. At this stage, a procedure called core decompression — drilling channels into the femoral head to allow new blood vessel formation — can slow or halt progression. In selected patients, this works. It is a much smaller operation than a hip replacement.

Stage III: The femoral head has begun to collapse. The characteristic “crescent sign” is visible on X-ray — a subchondral fracture marking the collapse. At this stage, the joint surface is irreparably damaged. Hip replacement becomes the appropriate treatment in most cases.

Stage IV: Full collapse, with secondary changes in the acetabulum (the socket). This always requires total hip replacement. The longer surgery is delayed at this stage, the more complex the reconstruction becomes.

The Symptom Pattern That Should Raise Suspicion

AVN in the early stages is often characterised by groin pain that is disproportionate to the findings on X-ray. A patient may say: “My X-ray looks normal, but my hip has been killing me for six months.” That sentence should trigger an MRI.

In the later stages, the pattern becomes more consistent with any severe hip arthritis — constant groin pain, pain with weight-bearing, limp, restricted range of motion.

If you are on long-term steroids, have a history of significant alcohol use, or have ever had a hip injury — and you are experiencing unexplained hip or groin pain — ask specifically for an MRI of the hip. Don’t accept “your X-ray is normal, it’s probably a muscle” if the pain doesn’t fit that explanation.

Hip Replacement for AVN: What to Expect

When AVN has progressed to Stage III or IV and hip replacement is needed, the procedure itself is the same Total Hip Replacement in Chandigarh I perform for osteoarthritis. The femoral head is removed and replaced with a prosthetic stem and head; the socket is replaced with a metal cup and plastic or ceramic liner.

The one difference in AVN patients is that bone quality around the femoral neck can sometimes be compromised, which requires careful pre-operative planning and sometimes specific implant choices. This is particularly important in younger patients with AVN who will likely need a revision in 20 to 25 years — getting the primary surgery right the first time matters enormously.

Recovery and rehabilitation after hip replacement for AVN follows the same course as any hip replacement. Walking the next day. Home by day five. Physiotherapy starting immediately. Most patients are fully functional within three months.

CTA: If you’ve been diagnosed with AVN, or if you suspect it, come in before it progresses. Early-stage AVN can sometimes be treated without joint replacement. Late-stage can always be treated with one — but sooner is always better. OPD: Tuesday and Thursday, Fortis Hospital Mohali. Call +91 79735 06344.