{"id":2833,"date":"2026-04-16T11:10:56","date_gmt":"2026-04-16T11:10:56","guid":{"rendered":"https:\/\/dr-yaser.com\/?p=2833"},"modified":"2026-04-16T11:14:22","modified_gmt":"2026-04-16T11:14:22","slug":"%d8%a7%d9%84%d9%86%d8%ae%d8%b1-%d8%a7%d9%84%d8%b9%d8%b8%d9%85%d9%8a","status":"publish","type":"post","link":"https:\/\/dr-yaser.com\/?p=2833&lang=en","title":{"rendered":"Avascular Necrosis (Osteonecrosis)"},"content":{"rendered":"

What is avascular necrosis?<\/strong><\/span>
\nAvascular necrosis occurs due to a lack of blood flow to the bone. As a result, bone cells die and deteriorate, causing pain and inflammation in the joints. You may develop avascular necrosis in one or more of your bones. This disease often spreads in the upper part of the femur (thigh bone). Other common sites include the upper arm, knee, shoulder, and ankle. It can affect men and women at any age, but it most often occurs in the thirties, forties, or fifties.<\/span><\/p>\n

What causes avascular necrosis?<\/strong><\/span>
\nThere are several causes of avascular necrosis. One cause is any disease that leads to reduced blood supply to the femur, resulting in avascular necrosis. Injuries to the femur and fractures of the femoral neck can damage blood vessels. Dislocation of the hip joint can tear blood vessels. Taking corticosteroids such as prednisone or methylprednisolone is one of the most common medication-related causes of avascular necrosis. Smoking narrows blood vessels, thus reducing blood flow to the hip area. Excessive alcohol consumption damages blood vessels and leads to avascular necrosis. Certain groups, such as deep-sea divers and miners exposed to air pressure changes, are at high risk for blood vessel damage. There is a long list of other diseases associated with avascular necrosis of the femoral head, including leukemia, sickle cell disease, and HIV infection.<\/span><\/p>\n

Which joints are affected by avascular necrosis?<\/strong><\/span><\/p>\n