Osteonecrosis cannot be fully reversed once it has progressed to structural collapse of the affected bone, but early-stage disease caught before collapse can often be slowed, stabilized, or functionally preserved with a range of treatments. The femoral head (the ball of the hip joint) is the most commonly affected site, and without treatment, collapse typically occurs within two to three years. The realistic goal for most patients is not regeneration of dead bone to its original state but preservation of the joint long enough to avoid or delay a total joint replacement, especially in younger people who would otherwise face decades of implant wear.
What Actually Happens Inside the Bone
Osteonecrosis develops when blood flow to a section of bone is cut off, causing bone cells in that area to die. The final common pathway involves compromised blood supply, though the route to that disruption varies. In traumatic cases, a fracture or dislocation physically severs the blood vessels feeding the bone. In non-traumatic cases, the blockage is more insidious: blood clots, fatty emboli clogging small vessels, or swollen fat cells inside the bone compressing the blood supply from within.1PubMed Central. Pathophysiology and risk factors for osteonecrosis Once bone cells die, the dead zone weakens. The body tries to repair the damage, but the repair process itself can further weaken the structural framework, eventually leading the bone surface to crack and collapse like a sinkhole forming under a road.2Seminars in Arthritis and Rheumatism. Pathogenesis and natural history of osteonecrosis
The Biggest Risk Factors
Corticosteroid use dwarfs nearly every other non-traumatic risk factor. A Japanese case-control study found that people who used systemic steroids but did not drink had an odds ratio of about 31.5 for developing osteonecrosis of the femoral head compared to people who neither used steroids nor drank. Adding heavy alcohol use on top of steroid use barely budged that number, suggesting the effect of steroids is so dominant that alcohol adds little additional risk when steroids are already in the picture.3PubMed. The effect of alcohol intake and the use of oral corticosteroids on the risk of idiopathic osteonecrosis of the femoral head: a case-control study in Japan That said, heavy alcohol intake remains a significant independent risk factor on its own, and other contributors include sickle cell disease, radiation therapy, organ transplantation, certain autoimmune conditions, and chemotherapy in cancer survivors.
For anyone on long-term or high-dose corticosteroids, this is worth flagging with your doctor. Many patients who develop osteonecrosis were prescribed steroids for a different condition and had no idea their hip was at risk until pain set in.
Why the Stage at Diagnosis Changes Everything
Osteonecrosis is classified into stages, with the international ARCO system being among the most widely used. The dividing line that matters most is whether the femoral head has collapsed. Collapse, which defines the transition to more advanced stages, fundamentally changes your treatment options. Before collapse, joint-preserving procedures have a reasonable track record. After collapse, the geometry of the joint is disrupted, cartilage starts to degrade, and the path usually leads toward joint replacement.4PubMed Central. Predicting the collapse of the femoral head due to osteonecrosis: From basic methods to application prospects
Distinguishing between just-before-collapse and just-after-collapse stages can be tricky even for experienced radiologists. Early post-collapse stages sometimes preserve the outer contour of the femoral head, making imaging interpretation challenging.5PubMed. CT and MRI findings beyond the subchondral bone in osteonecrosis of the femoral head to distinguish between ARCO stages 2 and 3A This is one reason why getting an MRI sooner rather than later matters. A meta-analysis of over 40 studies found MRI detects early osteonecrosis with about 93% sensitivity and 91% specificity, making it the best available tool for catching the disease before irreversible damage sets in.6PubMed Central. Accuracy of MRI diagnosis of early osteonecrosis of the femoral head: a meta-analysis and systematic review
Conservative Approaches for Early-Stage Disease
If osteonecrosis is caught early, several non-surgical options are on the table. None of them represent a cure in the sense of regenerating dead bone to its former self, but they aim to relieve pain, slow progression, and delay or prevent collapse.
Protective weight-bearing, which means limiting how much mechanical load the hip bears through crutches or a walker, has shown surprisingly decent results. A systematic review and meta-analysis of randomized trials and observational studies concluded that protective weight-bearing allowed most pre-collapse patients to preserve the hip. Even some post-collapse patients were able to delay surgery. The short-to-medium-term outcomes were comparable to surgical hip preservation approaches.7PubMed Central. Application of protective weight-bearing in osteonecrosis of the femoral head: A systematic review and meta-analysis of randomized controlled trials and observational studies This is not a glamorous intervention, but it is low-risk, and for patients who cannot undergo surgery, it represents a real option.
Pharmacological treatments include bisphosphonates (which slow bone breakdown), statins, vasodilators, and anticoagulants. The rationale behind each varies: bisphosphonates try to preserve the structural scaffolding of the dying bone, vasodilators aim to improve blood flow to the area, and anticoagulants target the tiny blood clots that may be contributing to the problem. However, the evidence for all of these remains limited, and no firm guidelines exist for their use. Many patients who start on medications eventually progress to needing surgery.8PubMed Central. Conservative Treatment in Avascular Necrosis of the Femoral Head: A Systematic Review
Hyperbaric Oxygen and Shockwave Therapy
Two less conventional approaches have generated interest. Hyperbaric oxygen therapy (HBOT) involves breathing pure oxygen in a pressurized chamber, which floods the tissues with oxygen and appears to reduce inflammation and bone marrow swelling. One study found that patients who received HBOT had measurable decreases in inflammatory markers, reduced bone marrow edema on imaging, and lower self-reported pain.9PubMed Central. Hyperbaric oxygen therapy ameliorates osteonecrosis in patients by modulating inflammation and oxidative stress It is generally used as a supplement to other treatments rather than a standalone cure.
Extracorporeal shockwave therapy (ESWT) sends focused sound waves into the affected bone. The idea is that the mechanical energy stimulates the release of growth factors that promote new blood vessel formation and bone repair.10PubMed Central. Extracorporeal shock wave therapy with imaging examination for early osteonecrosis of the femoral head: a systematic review Clinical studies have reported improvements in both pain and hip function, along with some regression of the necrotic lesion on imaging.11International Journal of Surgery. Extracorporeal shockwave therapy for avascular necrosis of femoral head Like HBOT, ESWT is non-invasive and carries low risk, making it appealing for patients in early stages who want to try everything short of surgery. The evidence is encouraging but still lacks the robustness needed for firm clinical guidelines.
Core Decompression
Core decompression is the most widely used surgical procedure for early-stage osteonecrosis. The surgeon drills one or more channels into the femoral head to relieve the pressure building up inside the bone, which is thought to restore some blood flow and create a pathway for new bone to grow. A systematic review and meta-analysis found core decompression to be both effective and safe, with success rates improving further when the drilling is combined with autologous bone or bone marrow grafting.12PubMed Central. The efficacy and safety of core decompression for the treatment of femoral head necrosis: a systematic review and meta-analysis Adding a vascular pedicle graft, where a piece of living bone with its blood supply still attached is transplanted into the drilled channel, can help jump-start revascularization of the dead zone.13PubMed Central. Osteonecrosis of femoral head: Treatment by core decompression and vascular pedicle grafting
The procedure works best before collapse. For more advanced disease, the results become less predictable, and surgeons approach it with caution.12PubMed Central. The efficacy and safety of core decompression for the treatment of femoral head necrosis: a systematic review and meta-analysis
Bone Grafting
When the necrotic area is larger or structural support is a concern, surgeons may turn to bone grafting. Vascularized bone grafts, most commonly a piece of the fibula (the smaller bone in the lower leg) transplanted along with its artery, aim to bring fresh blood supply directly into the dead region while providing a structural scaffold.14PubMed Central. Treatment of osteonecrosis of the femoral head with vascularized bone grafting In post-traumatic osteonecrosis, free vascularized fibular grafts have shown native hip survival in roughly two-thirds of patients at a minimum of five years, along with improved functional scores.15Injury. Outcomes of free vascularized fibular graft for post-traumatic osteonecrosis of the femoral head
Non-vascularized bone grafts (donor bone without a blood supply) are simpler to perform. A comparative study found that non-vascularized allogenic grafting and core decompression alone had broadly similar radiographic survival rates near 77%, with clinical survival above 90% for both groups.16Frontiers in Surgery. Core decompression vs. allogenic non-vascularized bone grafting in patients with osteonecrosis of the femoral head The decision between graft types depends on the size and location of the lesion, the patient’s age, and how much structural reinforcement the dead area needs.
Stem Cells and Biologics
The most exciting frontier in osteonecrosis treatment involves cell-based therapies. The concept is straightforward: if dead bone needs living cells to rebuild, why not inject a concentrated dose of bone marrow stem cells directly into the affected area during core decompression? A meta-analysis comparing core decompression combined with autologous bone marrow stem cells versus core decompression alone found that adding stem cells produced better pain relief, improved clinical outcomes, and more effectively delayed femoral head collapse.17International Journal of Surgery. Core decompression combined with autologous bone marrow stem cells versus core decompression alone for patients with osteonecrosis of the femoral head: A meta-analysis A comparative study confirmed these findings, noting that some patients saw not just stabilization but actual improvement in clinical and imaging markers.18The Journal of Arthroplasty. Combining Concentrated Autologous Bone Marrow Stem Cells Injection With Core Decompression Improves Outcome for Patients with Early-Stage Osteonecrosis of the Femoral Head: A Comparative Study For young patients especially, stem cell augmentation offers the possibility of avoiding or substantially delaying hip replacement.19PubMed Central. Stem cell treatment for avascular necrosis of the femoral head: current perspectives
Platelet-rich plasma (PRP) is another biologic tool, often used alongside core decompression and stem cells. PRP appears to work through multiple mechanisms: promoting new blood vessel formation, dampening inflammation in the necrotic lesion, and protecting cells from steroid-induced death.20PubMed Central. The Use of Platelet-Rich Plasma for the Treatment of Osteonecrosis of the Femoral Head: A Systematic Review Laboratory research on growth factors like bone morphogenetic proteins (BMPs) and vascular endothelial growth factor has shown they can increase bone formation and blood vessel growth in animal models, and one clinical study found that adding BMP-2 during surgery improved radiographic signs of repair compared to surgery without it.21PLOS ONE. Recombinant Human Bone Morphogenetic Protein-2 in Debridement and Impacted Bone Graft for the Treatment of Femoral Head Osteonecrosis Clinical use of these growth factors in humans remains limited, however.22PubMed Central. Osteonecrosis of the femoral head: treatment with ancillary growth factors
When Joint Replacement Becomes the Answer
For patients whose femoral head has already collapsed or whose earlier treatments have failed, total hip arthroplasty (THA) becomes the most reliable option for restoring function and eliminating pain. The concern with THA in osteonecrosis has historically been that many of these patients are young, meaning an artificial hip would need to last decades under heavy use. Modern implant technology has substantially improved outcomes in this group. Innovations in cementless designs, ceramic bearings, and highly cross-linked polyethylene have extended implant longevity.23PubMed Central. Outcomes of total hip arthroplasty in patients with osteonecrosis of the femoral head-a current review
A study of 135 young patients who underwent THA for osteonecrosis found 86% implant survival at 10 years and 66% at 20 years, with good functional scores for pain and daily activities. Men and patients over 25 at the time of surgery tended to fare better.24PubMed. Outcomes after total hip arthroplasty in young patients with osteonecrosis of the hip Among adolescents and young adults who developed steroid-induced osteonecrosis after cancer treatment, THA produced significant improvements in range of motion, pain, and return to school, work, and sports.25The Journal of Arthroplasty. Total Hip Arthroplasty in Adolescents and Young Adults for Management of Advanced Corticosteroid-Induced Osteonecrosis Secondary to Treatment for Hematologic Malignancies Joint replacement is not a failure of treatment. For many people, it is the intervention that gives them their life back.
When Multiple Joints Are Affected
Osteonecrosis does not always confine itself to one hip. Multifocal osteonecrosis, where the disease appears in several joints simultaneously, occurs most often in patients with systemic risk factors like prolonged steroid exposure. The knees, shoulders, and ankles are the most common secondary sites after the femoral head.26The Journal of Arthroplasty. Associated Risk Factors, Pathogenesis, Diagnosis, and Treatment Options for Multifocal Osteonecrosis: A Systematic Review Whole-body MRI can screen for involvement in multiple joints at once, which is important because patients focused on hip pain may not realize their shoulder or knee is also affected.
Treatment for multifocal disease follows the same general principles as single-joint osteonecrosis: preserve joints caught before collapse, and consider arthroplasty for those that have already collapsed. The challenge is that managing three or four affected joints simultaneously is far more complex than treating one, requiring coordinated surgical planning and rehabilitation.
Bilateral hip involvement, where both femoral heads are affected, significantly worsens quality of life. Patients with bilateral disease report worse physical health and more referred pain in the low back and knees compared to those with only one hip involved. Pain scores and functional limitations also track closely with the stage of collapse.27PubMed. Do femoral head collapse and the contralateral condition affect patient-reported quality of life and referral pain in patients with osteonecrosis of the femoral head?
What Recovery and Long-Term Outcomes Look Like
The question “can it be cured?” is one that patients understandably frame in binary terms. In practice, the answer is more of a spectrum. Some patients with early-stage disease who undergo core decompression with stem cell augmentation see their imaging stabilize and their pain fade to near-zero. One case report described a young adult cancer survivor with steroid-induced osteonecrosis who, after rehabilitation, achieved a pain level of one out of ten at two years without anti-inflammatory medication, returned to work, and resumed a fully active life.28PubMed Central. A Case of Successful Rehabilitation for Controlling Chronic Pain Following Osteonecrosis of the Femoral Head in a Young Adult Cancer Survivor That is about as close to a functional cure as the disease allows, even if the bone itself is not pristine on imaging.
At the other end of the spectrum, patients diagnosed after collapse face a more predictable trajectory toward joint replacement. The encouraging news is that replacement outcomes continue to improve, and the gap between osteonecrosis patients and osteoarthritis patients who receive artificial hips has narrowed considerably with newer implant materials.
The treatment landscape for osteonecrosis has a comprehensive toolbox that ranges from simply reducing how much weight you put on the joint all the way through biologic augmentation and joint replacement.29Journal of Orthopaedic Translation. Hip joint-preserving strategies for treating osteonecrosis of the femoral head: From nonoperative to operative procedures Which tools get used depends almost entirely on timing. The single most important variable is not which drug or procedure you choose but how early the disease is caught. If you are in a high-risk group, particularly if you have been on corticosteroids, and you develop groin or hip pain that does not have an obvious explanation, pushing for an MRI early can make the difference between keeping your own hip and needing a new one.