What is Osteonecrosis

TL;DR: Osteonecrosis, also known as avascular necrosis, is a debilitating condition where bone tissue dies due to a temporary or permanent loss of blood supply. Over 410 members of the DiseaseMaps.org community are currently managing this condition, which most commonly affects the hip, knee, and shoulder joints.

What causes Osteonecrosis to occur?

Osteonecrosis occurs when blood flow to a section of bone is interrupted. Without a consistent supply of oxygen and nutrients, the bone tissue begins to break down and eventually collapses. While the exact trigger is not always clear, the pathophysiology typically involves damage to the tiny blood vessels supplying the bone or an increase in pressure within the bone marrow that restricts blood circulation. In the DiseaseMaps.org community, patients frequently report that the condition significantly impacts their mobility and quality of life.

Who is most at risk for developing Osteonecrosis?

Osteonecrosis can affect anyone, but it most commonly occurs in adults between the ages of 30 and 50. While prevalence data varies, it is estimated that approximately 20,000 to 30,000 people are diagnosed with osteonecrosis annually in the United States alone. Key risk factors include:

• Long-term use of high-dose corticosteroid medications


• Excessive alcohol consumption


• History of traumatic injury, such as a hip fracture or dislocation


• Underlying conditions like sickle cell disease, Gaucher disease, or systemic lupus erythematosus


• Deep-sea diving or working in high-pressure environments (caisson disease)

How does Osteonecrosis differ from other bone conditions?

Unlike osteoporosis, which involves a systemic thinning of bone density, osteonecrosis is a localized event caused by vascular failure. It is distinct from arthritis in that the primary issue is the death of bone cells (osteocytes) rather than the wear and tear of joint cartilage. If left untreated, osteonecrosis can lead to severe joint deformity and the need for surgical intervention, such as core decompression or total joint replacement.

Next steps

• Consult an orthopedic surgeon or a rheumatologist to discuss imaging options like MRI, which is the gold standard for detecting early-stage osteonecrosis.


• Join the DiseaseMaps.org community to connect with 410+ others who understand the challenges of living with osteonecrosis.


• Discuss potential lifestyle modifications, such as alcohol cessation or medication adjustments, with your primary care physician.

Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Osteonecrosis


• Orphanet: Avascular necrosis of bone


• American Academy of Orthopaedic Surgeons (AAOS): Osteonecrosis of the Hip


• Journal of the American Academy of Orthopaedic Surgeons: Pathophysiology and Management of Osteonecrosis