Attempting to open my hand . . . make the fingers straighten out . . . is a real effort and I've had to do it slowly over time while having breakfast. Eventually the "troubled ones" do open up with some painful coaxing. Fortunately at this point in life it's just the last two on my left hand.
That said I don't take any medication for it nor do I want to. But I have found a solution. I'm not recommending it but am just sharing the results I have had.
Heat can transform. Heat can loosen up things. I remembered seeing mechanics over the years use a torch to apply heat to loosen up frozen bolts/nuts and other things.
So I started thinking about that tall coffee I have every morning. I noticed how the comfortably warm mug fit nicely into my hand. And it's not a wide mug either. I'm able to hold it in my left hand (not using the handle) with a good grip and let the heat sink in. Regular coffee cups can be real hot so don't use one of those if it would be injurious . . . or at the very least let it sit a while on a table to cool down to a level of comfort that works for you. An insulated mug that allows "comfortable" heat to emit is best. Burning your hand is of no use here!

One morning I had the idea to see if that heat would help loosen up my stiff finger joints. So I poured a tall one and sat back to watch some TV while it cooled for a few minutes on the table. Then I picked up the mug and had a few sips. The warmth on my hand felt good. After a few minutes . . . you've got to give it some time . . . I tried to fully extend (incrementally) my stiff fingers and low and behold they seemed to magically open up and with almost no pain or resistance at all. Not perfect . . . but close enough. Once I can get them extended I'm generally good for the whole day. Keeping them moving and grooving.

It was worth getting up that day just to discover another way to improve my life and extend my riding years. Sometimes the tried and true simple things passed down through the ages are all you need to get by.
