From what I recall, it sounded like the nerve IS the problem, not that it's warning his brain about something else. Thus, treating the nerve is treating the problem. I could be wrong, though. Here's why he didn't have surgery earlier (http://www.cbssports.com/mlb/eye-on-baseball/24516523/ryan-braun-opted-not-to-have-thumb-surgery-during-ped-suspension): "The only two surgeries we knew of last year, neither of them were appealing," Braun said. "Look, I rely on the advice of people who are much more knowledgeable on this stuff that I am. The only two surgeries they described last year, one is I would never feel anything in my thumb again, because they would completely remove the nerve. That doesn't make sense just long-term, living life. The other one, there would be nerve endings, because they would remove the nerve but the nerve endings would still be there, which could be really painful, and [Dr. Don Sheridan, the specialist who examined Braun several times] said he didn't think that would be a great option, either."