@tsch

Yes, I know that one can't have but a 2nd injection on a day some weeks or months after the 1st injection, and after the 2nd injection, only a last 3rd injection. I hope I won't need this again but was told that I could surgery to cut the pulley (sheath) that the thumb tendon can't get through due to being swollen. I also have a LEFT hand thumb having OA but I don't intend to have anything done to that bone which is deep into the palm but connected to the thumb chain of bones. With the LEFT thumb, I only rarely an ultra-sharp physical pain when I do certain simple physical things with that hand. The RIGHT thumb was important because I collect and write with fountain pens. For proper writing with a fountain pen, that outermost thumb joint has to be flexed when writing. I asked the hand therapist working with me on the RIGHT thumb why he thinks people develop trigger thumb. He said that after questioning those having trigger thumb, the common theme was that all had done some repetitive, unusually, uncommonly forceful thing with that hand.