Me, too. In both femoral heads. From corticosteroids and Systemic Lupus, “one or the other, probably both” the docs said. Chicken/egg. I don’t think it matters, anymore, although it once bothered me a lot because if I could know the cause maybe I could stop it. Now I know better.
My groins hurts every moment and has since 1996, deep pain in those broken balls of dead bone. I am sorry you both have the dead and dying bones whose blood supply has stopped. It makes no sense to me. And no one should hurt and wait until everything stops. But we do. Shoulds never meant anything to pain.