In reply to purple sue:
Bad luck on hurting your thumb! Just to say it may be worth getting a professional opinion on what damage you have done. I failed to do that when I simultaneously hurt both thumbs 20+ years' ago and am paying the price now as it turns out I had totally ruptured the ligaments in both. These could have been stitched back together immediately after the accident whereas repair at this stage, when I am having increasing problems, will be more tricky - to the extent that some parties think I should have the joints fused.
Good luck with it.