Ada,
Good luck with the surgery. I had Duypens contracture (i know I didn't spell it correct) in my left hand. I had the block before surgery and never had a problem. follow what the doc says, and if he is like mine, he had me doing PT on day 5. I thought he was nuts, but I did it and everything was great. Hated wearing the hand/wrist brace for 5 months tho. if you can, try to let us know how it went and how you are feeling.
Hugs
Mary