Over my riding years I've sprained my thumbs numerous times. My chiropractor says I've developed arthritis in both. 6 weeks ago I jammed my right thumb, and it hasn't really healed since. When I ride now the slightest impact seems to re-injure it. I went back to my chiro for some ultrasound and an adjustment. He said I irreparable ligament damage. I have very little grip strength in that hand, and after riding 3-4 laps it becomes very difficult to hang on. Is there anything I can do to condition my thumb? The joint is twice the size of the other one and it's not because of swelling. Would surgery help. I'm 33 years old and race in the +30 expert class. I would like to continue to be competitive, but it's becoming more difficult. Any suggestions?