Thanks everyone,

The fact that I can play at all is amazing to me, considering my ring finger is still bent at nearly thirty degrees. I can now play simple tunes using D, A and G and Em if I need it. I can play ten or fifteen minutes at a stretch. I haven't played any new chords since I started this thread, but I'm still doing "finger-walking" and splints and several exercises to stretch the PIP joint, including variations of opening and closing the hand, in or out of warm water, as some of you have mentioned.

I couldn't type for several months, which is why no one heard from me sooner. I can type just fine now.