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