Elbows, arrm's, wrists, fingers. I have issues there too. Sometimes it starts in my elbows. They lock up and pop real loud. They hurt like someone hit them with a hammer. The Neurologist wanted to cut them open and move the nerve to the other side of my elbow. WTF!
Ulner nerve transplant. Wife had one of those done very long time ago. Probably wasn’t necessary… As I understand it, real problem was carpal tunnel that eventually had to be done anyway.