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