Medically Reviewed by Dr Wang Lushun Exactly what is Avascular Necrosis (AVN)? Avascular necrosis, often called osteonecrosis, happens in the event the blood offer to bone cells is disrupted, resulting in the death of bone tissue. It usually targets the hip joint, notably the femoral head–the upper “ball” part of https://www.theorthopaedicandpainpractice.com/what-is-avascular-necrosis-of-the-hip/?_gl=1*xbbxlb*_up*MQ..&gclid=Cj0KCQjwkt6aBhDKARIsAAyeLJ2krYJSOuy5mZksrNqH-VDjQwW1ScD49yD8BUWysDG6u6bJPCSbXVUaAuCPEALw_wcB