I got that done on my thumbs and it worked brilliantly - nothing to it really. Please do not go hog wild with shots of cortisone into your fingers - it eats the bone up. The BEST thing I have found for arthritis - particularly in my hands - is boron. Boron is a trace mineral and I've been doing a lot of research on it. I've been taking it a little over two years for osteoporosis - but it took ALL of my arthritis pain away! If I feel any pain, I just pop another one. But basically I take 6 mg at breakfast, 6 mg at lunch, 6 mg at dinner, and 6 mg before I go to sleep. You can get it from raisins and prunes and other foods (you can do a search for this) - this is why Ruth Bader Ginsburg ate prunes all the time. You just cannot get enough from prunes to do much good. The upper limit for boron has been set at 20 mg/day - but I have spoken to hundreds of people who are taking 120 mg/day, and they have been taking that dose for years and years (EDS, osteoporosis and arthritis are the main reasons for taking boron). It is hard to find good research about boron - I was able to find some at the NIH (National Institute for Health). Doctors don't know anything about boron. My hand surgeon wanted to do extensive surgery on my hands and I was all set to get it - then I discovered boron. There is no way I am having any more arthritis-related surgery now that I have boron. And it is super cheap.
Good luck to you! Arthritis really hurts - I used to cry myself to sleep with my hands just hurting so bad. Now I can crochet and play piano again. A nutritionist might be able to tell you about boron. It is really hard to find anything about it - and yet people have been using it for hundreds of years for arthritis. This is my third winter without pain and I LOVE it!