I achieved remission as measured by SED and CRP testing in three months after initial diagnosis. At that point I had tapered from a high of 30 to 10 of prednisone.
My rheumy informed me that we were no longer treating PMR, that I could expect various non-PMR pains to occur, and that the task at hand was to slowly taper off prednisone without provoking adrenal insufficiency or crisis.
I tapered from 10 to 5 at 1 per month, then at 0.5 per month, now at 2. During this period I have occasionally experienced periods of cramps and pain in my arches, lower legs, wrists, rotator cuffs, and fingers. As my adrenals have (apparently) restarted production of cortisol, these pain episodes have stopped. Mild osteoarthritis was diagnosed during the taper in my wrists with xray.
Until your adrenals resume (hopefully) cortisol production, conditions such as osteoarthritis which had previously been kept under control by normal adrenal cortisol production can be expected to cause pain.
All pain is not PMR pain, and therefore should not be treated with prednisone.
It is complicated, and there is not one template that fits everyone. Hopefully we all have docs that are cognizant of this variety of possibilities, and are willing to consider changes based on your testing and symptoms. Again, all pain is not PMR pain.
Good luck.