Well after 2 surgeries and months of rehab, my doctor has ended my recovery from replacement of the PIP joint in my middle finger. I have almost zero voluntary movement in the joint. When opposed, the finger can move up to 40 degrees, i.e. when I grab something. It sits at an angle of 35-40 degrees at all other times.
On the plus side, there is no more pain, which of course was the reason for seeking help in the first place. However the result is disappointing, and I do not know if I would have done it had I known I would lose so much use of the finger, however it is likely I would have at least waited longer. As an anesthesiologist friend of mine told me, surgeries are always a risk.
I wish anyone considering joint replacement to carefully consider the possible consequences. In my case it turnout out to be an exchange of freedom from pain for some unexpected loss of use of the finger. Good luck to all.