Hi, my dad has WG and his hip joint has deteriorated significantly and now needs a hip replacement. He was also recently told that it appears as though his spine is narrowing. I am concerned that the doctors are not joining the dots and are focusing on a hip replacement, rather than the root cause. They have diagnosed osteoarthritis as the cause of his hip deterioration. However, I was doing a bit of research on the internet and came across Avascular necrosis. Does anyone know anything about this and its link with steroids?