I do not claim this as a medical cure. I only relate my experience.
I have used Omega Nutrition's Garlic-Chili Flax Oil every day for about the last 25 years. When I started, both of my hands fingers were locking in a closed bent position, requiring me to forcibly "unlock" them. Reading and looking for some relief, I thought I needed more Omega 3, and I settled on Flax Oil. I soon discovered I did not like the taste of plain Flax Oil. I lived near a store that carried Omega Nutrition's Garlic-Chili Flax Oil, tried it, and I liked the taste. I do not taste the garlic or chili, but the combined flavor suits my taste buds perfectly. I started using it on everything possible. Salads, sandwiches, and everything I thought it would go with or in. I discovered I loved it, and after somewhere around 1 to 2 months I noticed a continual improvement in my hands, and the problem became resolved without any other changes in my diet. I have reduced the amount from what I was consuming at first. I still love the taste, and have found that when I do not take enough my fingers start to lock again, so I increase to the point where they are OK. I consume a bottle around every 2-3 weeks, and I still very much enjoy the taste. I no longer live near a store selling it, but I have purchased directly from Omega Nutrition for a long time now, and I recommend them. I only use 3 oils at home. Garlic-Chili Flax Oil (added to already cooked dishes), Olive Oil (used for cooking or just added to some things), and Coconut Oil (for some very specific recipes). I highly recommend Omega Nutrition and specifically their Garlic-Chili Flax Oil.