I have the same. I don't know what it is but my doctor told me to take Glucosamine with Chondroitin. Also I was eating a lot of beans which I grew this year. I found out that do not eat Legumes with osteoporosis also peanuts as they stop the body to absorb calcium. Since I have stopped my fingers feel so much better. I can't take the Glucosamine as it has magnesium which does interact with my blood pressure medication. But it is very good.

I worked in a fish plant working with frozen fish for eights years don’t think that helped my hands either. I enjoy crocheting will hand on to that as long as I can. I do find it hard to open jars sometimes, I just hit lid with a knife. Lol

Have your hand xrayed. Sound a lot like osteoarthritis

I did some research on this. Seems certain foods, and there are several others, keep you from absorbing calcium as well. They don't recommend not eating these foods but waiting two hours or so after or before consuming calcium .

I looked up what foods not to eat with osteoporosis and that is what came up. It also said seeds. But I still put sunflower seeds on my breakfast as they have magnesium in them. And when I remember to buy them sesame seeds which apparently have calcium in them