Welcome to healthcare magic!
One sporadic shot of prednisolone
is not going to affect your surgery.
You can take it comfortably to ease the pain and inform your anesthetist about your problem, he ill agree.
You can undergo the surgery now but hen you are back on the normal routine I would like you to consult a physician/rheumatologist
You have three disease processes which need steroid
and steroid sparing immunomodulatory drugs so that the future deterioration can be limited.
I hope this advise would be helpful for you.
Still if you have any queries or doubts, please write me back,
I would be happy to solve them.
Wish you a great health!