Medically Reviewed by Dr Wang Lushun Precisely what is Avascular Necrosis (AVN)? Avascular necrosis, generally known as osteonecrosis, takes place in the event the blood supply to bone cells is disrupted, resulting in the death of bone tissue. It typically targets the hip joint, significantly the femoral head–the upper “ball” https://www.theorthopaedicandpainpractice.com/what-is-avascular-necrosis-of-the-hip/?_gl=1*xbbxlb*_up*MQ..&gclid=Cj0KCQjwkt6aBhDKARIsAAyeLJ2krYJSOuy5mZksrNqH-VDjQwW1ScD49yD8BUWysDG6u6bJPCSbXVUaAuCPEALw_wcB