I have painful Osteo- arthritis in both hands, in my first 2 fingers and thumbs.. the rest of my fingers are now starting to go the same way. It's extremely painful, and at night if I accidentally bump , or lay on my fingers I'm awake screeching with pain. I wear fingers splints to bed to protect them, available on Amazon, they wrap around the finger and are affixed with Velcro..
I've just discovered finger rings , and have bought a couple on Etsy, particualrly useful for the first knuckle of my right hand, extremely swollen, seriously mish-shapen.. but with the aid of the ring, I can write holding a pen again without the knuckle being seriously painful