Medically Reviewed by Dr Wang Lushun What Is Avascular Necrosis (AVN)? Avascular necrosis, often called osteonecrosis, takes place when the blood supply to bone cells is disrupted, resulting in the death of bone tissue. It generally targets the hip joint, especially the femoral head–the higher “ball” part of the femur https://www.theorthopaedicandpainpractice.com/what-is-avascular-necrosis-of-the-hip/?_gl=1*xbbxlb*_up*MQ..&gclid=Cj0KCQjwkt6aBhDKARIsAAyeLJ2krYJSOuy5mZksrNqH-VDjQwW1ScD49yD8BUWysDG6u6bJPCSbXVUaAuCPEALw_wcB