I have pain in the knuckle of my left ring finger, it is worse when I bend the finger or use it, pain has spread to little left finger knuckle too?

More info please! What do you do? (Work, hobbies etc) Are you right or left handed?? It is more likely than not that repetitive trauma rather than "arthritis" is responsible! You have to be a bit of a "detective" to find out! Hope this helps Dr Z.