What medical conditions or problems cause nontraumatic avascular necrosis?

What medical conditions or problems cause nontraumatic avascular necrosis?

There are several medical conditions or treatment that can lead to avascular necrosis:

• Osteoporosis. Elderly women (and some men) sometimes have spontaneous avascular necrosis of the knee (SPONK).
• Blood disorders, such as sickle cell anemia.
• Diabetes.
• Cancer treatments, such as radiation therapy.
• Decompression sickness in scuba divers.
• HIV.
• Lupus.
• Organ transplants.