This is a condition where the blood supply to the bone has been compromised due to injury or disease, and the bone in that area is permanently damaged causing pain and in later stages collapse of the bone. To avoid having to go for a hip replacement we treat this condition in stage I or II with a core drilling down to the femoral head into the defect. Than we perform a stem cell aspiration and place your own stem cells into the center of the defect to stimulate new blood vessel growth to repair the damaged bone.