I had the one in my head replaced after almost thirty five years with a polymer type.my neurologist put me on a patch system called Butrans lasts seven days works a lot better then the Oxys.
The doctors put my sister on fentanyl patch for her back pain. The patch was appaerntly faulty and now she is dead at 45 because of an accidental OD.
Please beware of all patches.... after time you learn to deal with the pain.
I have 3 pins holding my wrist together for the last 29 years. I have learned to deal with it. Every now and then (couple months) I will take 1/2 a perc and im good since I have no tolerence anymore. If it were an option for me MJ would be my choise if I really had to but it's not an option with my work.
But each of us are different but please becareful.