Cortisone injections

Cortisone Injections safe? My orthopedic surgeon suggested a cortisone injection in my rotator cuff for 2 partial tears that showed up on the MRI. This was effective in alleviating most of the arm at side pain, but still have pain when I use the arm. Now it's 2 months later and he is suggesting another cortisone injection. I was told by another Dr. that Cortisone softens the bones and she didn't like it being used. What do you think? Should I have another one? Surgery may be the next step. I am taking Ibuprofen 600mg. up to 3 times a day which has helped so I can sleep better. I'm going to the Dr. tomorrow AM so any help would be appreciated ASAP