I have CMC joint arthritis in my left thumb. An occupational therapist my wife knows (my wife's a physical therapist) recommended this brace, and it''s been a big help for me:
http://www.push.eu/products/hand-bra...humb-brace-cmc
It's a very compact brace. With practice I've been able to play while wearing it. Figuring out the correct size brace you need is important. My wife was able to do that for me. There may be instructions on the website link, or if you're seeing a PT or OT you might discuss the brace with them.
It's not a cure, and I may need surgery at some point, but that surgery scares me and I'd like to avoid it as long as possible.
Since I know what size brace I need, I was able to order a second one on Amazon. I've been using the brace for over a year.