Happen to me too First Osteopenia and then after chemo and radiation it became osteoporosis- but it runs on my family too. I am now taking Anastrozole and Prolia. I have back and hip / muscle pain especially after receiving the Prolia. It goes away after 3-4 month but then it is time to get the next shot. So I try to spread the injection out a little bit more . Hitting the 2 years mark in October and will have at that time another Scan. Hope that it helped. My Oncologist recommended to walk „as much as you can“ daily. So that what I do now. Some days are better than others. Hope you doing well.