Causes of Avascular Necrosis (AVN) of the Femoral Head:
AVN of the femoral head is primarily caused by impaired blood supply to the bone, resulting in bone tissue death and subsequent structural collapse NICE CKS Vega et al. 2026. Key risk factors include prolonged corticosteroid use, excessive alcohol consumption, trauma such as femoral neck fractures or hip dislocations that disrupt blood flow, systemic inflammatory diseases like lupus, and metabolic abnormalities such as hyperlipidemia NICE CKS Vega et al. 2026. Additional nontraumatic causes include hematologic disorders, autoimmune diseases, and other systemic conditions NICE CKS Roberts et al. 2025. The femoral head is particularly vulnerable due to its terminal blood supply, making it the most common site for osteonecrosis Kaza et al. 2025 Bischoff et al. 2025.
Treatment Options:
The management of AVN depends largely on the stage of the disease, classified by systems such as the Ficat and Arlet or Association Research Circulation Osseous (ARCO) classifications, which distinguish precollapse stages (I–II) from postcollapse stages (III–IV) NICE CKS Vega et al. 2026 NICE CKS Roberts et al. 2025. Early diagnosis, often assisted by MRI imaging, is critical to optimize outcomes NICE CKS Vega et al. 2026.
For early-stage AVN without femoral head collapse, conservative treatment may include lifestyle modifications such as reducing corticosteroid and alcohol use, physical therapy, and symptom management with NSAIDs or intra-articular injections, though these measures rarely prevent progression NICE CKS Malizos et al. 2007 Vega et al. 2026. Surgical intervention in early stages generally involves core decompression, which reduces intraosseous pressure and promotes revascularization by drilling into the necrotic bone NICE CKS Vega et al. 2026. Core decompression is typically indicated in ARCO stages 1 and 2 and has demonstrated substantial improvements in patient outcomes and survival of the femoral head at two years, with success rates in the range of 70-80% NICE CKS Vega et al. 2026. It may be augmented with biological or synthetic bone grafts, although conclusive evidence regarding superiority of augmentation is lacking NICE CKS Vega et al. 2026.
In advanced stages characterized by femoral head collapse and joint degeneration (ARCO stages 3 and 4 or Ficat stage IV), joint-preserving procedures become less effective, and total hip arthroplasty (THA) is the treatment of choice NICE CKS Roberts et al. 2025. THA can be performed with cemented or cementless techniques, with cementless implants showing favorable long-term survivorship in AVN patients NICE CKS Roberts et al. 2025. The use of dual mobility cups and peripheral screw augmentation can enhance implant stability, especially in the context of poor bone quality NICE CKS Roberts et al. 2025.
Overall, early surgical intervention with core decompression is preferred to delay progression and preserve the native hip joint, while THA is reserved for cases with structural collapse and symptomatic joint degeneration NICE CKS Vega et al. 2026 NICE CKS Roberts et al. 2025.
Key References
- NICE CKS: Osteoarthritis
- (Malizos et al., 2007): Osteonecrosis of the femoral head: etiology, imaging and treatment.
- (Nalikashvili et al., 2024): ASEPTIC NECROSIS OF THE FEMORAL HEAD: WHAT DO WE KNOW ABOUT TREATMENT OPTIONS?
- (Bischoff et al., 2025): Navigating osteonecrosis of the femoral head: from diagnosis to innovative treatment techniques.
- (Kaza et al., 2025): Humeral head avascular necrosis: etiology, diagnosis, and management.
- (Vega et al., 2026): Core Decompression for Osteonecrosis of the Femoral Head.
- (Roberts et al., 2025): Avascular Necrosis With Complete Fragmentation and Collapse of the Femoral Head Treated With Cementless Total Hip Arthroplasty: A Case Report.