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