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For more information, see:Mayo Clinic | Wikipedia
Avascular Necrosis (AVN). This is the death of bone tissue due to a lack of blood supply. Also called osteonecrosis, avascular necrosis can lead to tiny breaks in the bone and the bone’s eventual collapse.
The blood flow to a section of bone can be interrupted if the bone is fractured or the joint becomes dislocated. Avascular necrosis of bone is also associated with long-term use of high-dose steroid medications and excessive alcohol intake.
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For more information, see:Mayo Clinic | Wikipedia
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