Sickle cell anemia: An inherited blood mobile problem that's characterized by abnormally formed hemoglobin that usually takes the form of the sickle. These sickled cells are fragile and prone to rupture and don't function as ordinary red blood cells. The treatment is dependent fully on the reason for the problem. https://www.theorthopaedicandpainpractice.com/what-is-avascular-necrosis-of-the-hip/?_gl=1*xbbxlb*_up*MQ..&gclid=Cj0KCQjwkt6aBhDKARIsAAyeLJ2krYJSOuy5mZksrNqH-VDjQwW1ScD49yD8BUWysDG6u6bJPCSbXVUaAuCPEALw_wcB