Spinal steroid injections while on Prednisone

Since a 2nd flare up recently of Polymyalgia, I am currently on 12.5 mg of Prednisone down from 15 mg which has significantly helped with pain everywhere except my lower back. I have had serious back issues which have always been managed with epidurals. As mentioned in an earlier posting, it is so difficult to tell the difference from lower back stenosis pain and PMR back pain. Has anyone had epidurals while on prednisone and are there additional risks?

I was diagnosed 2 years ago with PMR. I could not raise my arms above my neck and had trouble with both hips. Before all this I played a lot of golf and had several lower right back pulls that would usually heal in a few days. In the first month after PMR diagnosis I was attempting to put my socks on with one leg up on my dresser. I felt a terrible pull in my lower right back that I could not get out of bed for three days. This time it has not healed and two years later I can’t play golf and have trouble walking over a mile. I did have an MRI. My Rheumatologist refuses to believe that the back condition has anything to do with the PMR. During these 2 years I have tried months of PT, four steroid shots. Two in my hip and two in my back. Just a month ago the pain Docter tried a nerve block. All of this provided no relief for my back pain. He is now wanting to try an ablation. I don’t know if I will have that done. I am almost past two years of the PMR diagnosis. The rheumatologist started me on 12 mg of prednisone two years ago and I have tapered to 4.5. It sure gets tougher trying to get below 5. Any thoughts on this bad back?