In reply to Bob Kemp:
Ah, my sympathies! I too have basal joint arthritis, though at the moment it's in a quiet phase. I'm constantly amazed at how painful a tiny joint like this can be when it does flare - far more painful 'pound for pound' than my hip. However mine is nowhere near as advanced as yours. The furthest I've got along the line is seeing a rheumatologist who diagnosed it by a grind test - which I'm sure you'll agree, is a joy - but as yet no treatment. I expect you'll have found this little vid
http://www.youtube.com/watch?v=iSA1BSSQLPA where she describes the surgery at around 3mins. I was blown away when she said that they in fact just removed the trapezium and the gap naturally filled in! On that score, coincidentally I have arthritis issues on the other side of my hand (only the right so far whereas the thumb problem is in both hands) in the triquetral/pisiform carpal bones. The surgical treatment for this also, is to remove the offending bone...! Bit like a modern-day cure-all version of a 'course of leeches', but surely not a treatment that can go on ad infinitum!
Not a lot of help to you really, I'm afraid.