Last January I was diagnosed with GCA. Started on 60 mgs of prednisone. Now on 40 mgs. Also have severe osteoporosis in the spine and have just recently crushed two vertebrae. Quite a painful experience. It seems that prednisone robs the bones of calcium. My doctor has increased my calcium intake and has ordered a bone density test. Has anyone else had this problem Once my back heals, I'm wondering about exercises to strengthen me back muscles and maybe bone building medication. I'm nervous about more crushes.