Medically Reviewed by Dr Wang Lushun Exactly what is Avascular Necrosis (AVN)? Avascular necrosis, generally known as osteonecrosis, occurs once the blood supply to bone cells is disrupted, leading to the death of bone tissue. It usually targets the hip joint, specifically the femoral head–the higher “ball” portion of the https://www.theorthopaedicandpainpractice.com/what-is-avascular-necrosis-of-the-hip/?_gl=1*xbbxlb*_up*MQ..&gclid=Cj0KCQjwkt6aBhDKARIsAAyeLJ2krYJSOuy5mZksrNqH-VDjQwW1ScD49yD8BUWysDG6u6bJPCSbXVUaAuCPEALw_wcB