That rotisserie feeling can cause a lot of pain, with all those frequent movements.
I was a side sleeper before surgery but I have successfully learned to sleep on my back, and still do now, 4 years later!
What helped me most was to elevate both legs. My particular elevating wedge has a cut in trough for one leg, which is pretty hard to come out of in my sleep. My wedge is only designed for one leg, but I put the other leg on it also. This kept/keeps me still all night.
I also use my pillow to prop my head up somewhat straight.
I now fall asleep much faster than I did when I slept on my side, (I don’t know why) so that’s an added bonus!