The best treatment for avascular necrosis (AVN) depends almost entirely on one factor: whether the bone has already collapsed. Before collapse, joint-preserving procedures like core decompression can slow or stop the disease. After collapse, total hip replacement is the most reliable option for restoring function and eliminating pain. Catching AVN early dramatically changes the treatment path and the long-term outcome.
Why Staging Matters for Treatment
AVN progresses through distinct stages, and treatment decisions hinge on where you fall. In the earliest stage, standard X-rays look completely normal and the disease is only visible on MRI. As it advances, X-rays begin showing changes in the bone, including cysts and areas of increased density. The critical turning point is when the bone just beneath the cartilage starts to crack and give way, a finding called the “crescent sign” on X-ray. Beyond that, the femoral head (the ball of the hip joint) flattens, the joint space narrows, and full-blown arthritis develops.
The Steinberg classification system breaks this progression into seven stages (0 through VI). Stages 0 through II are considered pre-collapse, and this is the window where joint-preserving treatments have the best chance of working. Once you reach Stage III and the bone surface begins to cave in, the options narrow significantly. Your orthopedic surgeon will use imaging to determine your stage and guide treatment from there.
Core Decompression: The Standard Early Treatment
For early-stage AVN, core decompression is the most widely used surgical procedure. The concept is straightforward: a surgeon drills one or more small channels into the affected bone to relieve pressure inside it. The buildup of pressure within dying bone is a major source of pain, and reducing it can also encourage new blood vessels to grow into the area.
The American Academy of Orthopaedic Surgeons notes that core decompression, when performed before the femoral head collapses, is sometimes successful in preventing that collapse and the arthritis that follows. However, if it’s performed after collapse has already begun, the procedure is not usually effective at stopping further deterioration.
Recovery from core decompression follows a fairly predictable timeline. You’ll typically be limited to very light weight-bearing (around 20 pounds of pressure, essentially just resting your foot on the ground) for the first four weeks. Crutches are generally used for four to six weeks total, and you can stop using them once your walking pattern is pain-free and smooth. Returning to sports or high-impact activity takes four to six months, with full recovery potentially stretching to a year.
Bone Grafting for Pre-Collapse AVN
A more involved joint-preserving option is a vascularized fibular graft. In this procedure, a surgeon takes a small section of bone from your lower leg (the fibula) along with its blood supply and transplants it into the damaged area of the femoral head. The idea is to provide structural support to the weakened bone while also restoring blood flow.
When this procedure is performed before the femoral head collapses, clinical outcomes are generally favorable. It’s a more complex surgery than core decompression, with a longer recovery, but it may offer better structural reinforcement for larger areas of dead bone. Not every surgeon performs this procedure, and it’s typically reserved for younger patients with significant AVN who are trying to delay or avoid hip replacement.
Bone Marrow Concentrate: An Emerging Add-On
One of the more promising developments in AVN treatment involves combining core decompression with an injection of concentrated bone marrow cells. During the procedure, a sample of your own bone marrow is drawn (usually from the pelvis), processed to concentrate the stem cells and growth factors, and then injected into the decompressed bone.
The theory is that these concentrated cells can enhance the body’s ability to regenerate healthy bone tissue in the affected area. A major clinical trial currently underway is testing whether adding bone marrow concentrate to core decompression produces better results than core decompression alone. That trial isn’t expected to report results until 2029, so the evidence is still being built. Some orthopedic centers already offer this combination, but it’s not yet considered standard of care.
Total Hip Replacement After Collapse
Once the femoral head has collapsed and the joint surface is damaged, total hip replacement becomes the most successful treatment. The collapsed bone and damaged cartilage are removed and replaced with artificial components, typically a metal stem inserted into the thighbone, a ceramic or metal ball, and a new socket lining.
Modern hip replacements are remarkably durable. Most patients experience significant pain relief within weeks of surgery, and the artificial joint can last 20 years or more. For younger patients, this longevity matters because they may eventually need a revision surgery to replace worn components later in life. This is one reason surgeons try so hard to preserve the natural joint in early-stage disease.
Recovery from hip replacement generally involves walking with a walker or crutches for a few weeks, followed by several months of physical therapy. Most people return to daily activities within six to twelve weeks, though full recovery of strength and confidence in the joint can take several months longer.
Hyperbaric Oxygen Therapy
Hyperbaric oxygen therapy (HBOT) is being studied as a potential add-on to surgical treatment. The treatment involves breathing pure oxygen in a pressurized chamber, which forces significantly more oxygen into your blood and tissues than normal breathing allows. The goal is to support bone healing by flooding the affected area with oxygen.
Protocols being studied for AVN are intensive. One clinical trial is using 30 sessions before surgery and 10 after, with each session lasting two hours, five days a week. A reduced protocol in the same trial uses 20 sessions before and 10 after. That’s a substantial time commitment, and definitive evidence that HBOT improves outcomes in AVN is still being gathered. It’s not widely available as a standard AVN treatment, but some specialty centers offer it.
Managing the Underlying Cause
Treating the structural damage is only part of the equation. If the underlying cause of AVN isn’t addressed, the disease can progress in the affected joint or develop in other joints.
Corticosteroid use is one of the most common culprits. Research on bone marrow transplant patients found that even relatively modest cumulative doses of prednisone (the equivalent of less than 3,870 mg total) increased AVN risk fourfold compared to no steroid exposure. Higher cumulative doses pushed the risk even further: nearly six times higher in the middle range and over eight times higher at the highest doses studied. If you’re on long-term steroids for another condition, your doctor may work with you to find the lowest effective dose or explore alternative medications.
Excessive alcohol use and smoking are also well-established risk factors. Alcohol can increase fat levels in the blood, which may block small blood vessels supplying the bone. Smoking damages blood vessel linings and reduces oxygen delivery. Addressing these factors won’t reverse existing damage, but it can protect other joints and improve healing after treatment.
Non-Surgical Options and Their Limits
For very early-stage AVN with small lesions, some doctors take a watchful-waiting approach combined with protected weight-bearing (using crutches to keep pressure off the joint) and anti-inflammatory medications for pain. Physical therapy can help maintain range of motion and strengthen the muscles around the hip, which takes some load off the joint.
The challenge is that AVN has a high rate of progression. The majority of untreated cases, particularly those with medium to large areas of bone involvement, will eventually progress to collapse. Non-surgical management is generally a temporizing measure rather than a definitive treatment. It may be appropriate for patients with very small lesions, those who aren’t surgical candidates, or as a bridge while planning a procedure.