Ouch. At least it was only a finger and not the WHOLE hand. Let it heal well before you start using it too much. Then do aggressive therapy to regain use. It won't ever be normal again, but it should be functional.
Things are going well so far with only one hiccup 3 weeks ago. Finger swelled and split - wrecking half the skin graft.
It has been healing on it's own since and all is looking well. I should be cast & pin free on friday!
Initial movement is looking good - mainly because I did not mangle the bottom of the finger at all so my grip strength should return