@4russcoll, I had TKR during second year of PMR when on 6 mgs prednisone. The hospital had a group of us to council before and just after. Remember to ice and elevate several times a day after exercises given you. Both legs were swollen for a few months, not to worry. YOU may have to up your pred after as I had a flare and not realizing it as such went to ER a couple of times. They didn't know either as most medical persons still don't know of PMR. Good luck.