Had arthroscopic surgery on my shoulder a wk ago.they removed scar tissue.for the past 2 days i have had spasm in my hand.is it normal after surgery?

Yes: Yes, spasms on the same side of your surgery are common after shoulder arthroscopy esp. If u had an interscalene nerve block as well. They should go away. If they haven't make your ors aware at your post-op follow up.

Potentially : Potentially this could be normal particularly if you had a block in your shoulder or if you been immobilized in a sling. I would recommend that you discuss this with your surgeon when you return for your first postop check.