Osteonecrosis, also known as avascular necrosis (AVN), is a bone disease that occurs when blood flow to a section of bone is interrupted. This lack of blood supply causes the bone tissue to die, leading to pain, stiffness, and potential joint collapse.
Symptoms:
- Pain: This is the most common symptom of osteonecrosis. The pain is often deep and aching, and it may worsen with activity.
- Stiffness: The affected joint may become stiff, especially in the morning or after periods of inactivity.
- Loss of range of motion: As the bone tissue dies, it may collapse, leading to a loss of range of motion in the affected joint.
- Joint instability: In some cases, the joint may become unstable, making it difficult to bear weight on the affected area.
Causes:
- Trauma: Fractures or dislocations can damage the blood vessels that supply blood to the bone.
- Steroid use: Long-term use of high-dose corticosteroids can increase the risk of osteonecrosis.
- Alcohol abuse: Excessive alcohol consumption can also damage blood vessels and increase the risk of osteonecrosis.
- Certain medical conditions: Conditions such as sickle cell anemia, lupus, and Gaucher’s disease can increase the risk of osteonecrosis.
- Radiation therapy: Radiation therapy to the bone can damage blood vessels and lead to osteonecrosis.
- Caisson disease: This condition, which is caused by rapid decompression, can damage the blood vessels in the bone and lead to osteonecrosis