I have hip pains because I have osteopenia in my right hip. A bone density test from my ob/gyn confirmed this. I also had burning pain deep in my hip bones after getting an MRI to check for other problems with my hips. It lasted only one night after the MRI but was definitely there. I don't know if it's related to rsd, but I've had other MRI's on other parts of my body, like my abdomen, and never had this problem before. I hope that you find what is wrong and feel better soon.