HI there,
I almost lost my right index finger 36 years ago, and when they did the repair surgery I lost the use of the joint below the fingernail. I am right handed; and still am able to cross stitch, sew, crochet, knit, and have just started doing wool applique. You should be fine when done your therapy. Actually, I don't even notice it unless I think about it now.
Good luck and hope you have a great outcome!!!
Nancy