Bruno, I'm sorry to hear that. Two things I've heard about arthritis: keep moving and take glucosamine.
I wouldn't be surprised if these may provide a good type of movement for your hands and thumbs:
http://www.natashascafe.com/html/balls.html
Hugs and pain reducing butterflies,
~T~




				
				
				
					
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 Keep moving, find things you like to do with your thumb. Knit, learn sign language, juggle, play piano or another instrument, use those Chinese medicine chromed ball thingies that you rotate in your hands, stage finger puppet shows .... just keep moving the joint and surrounding muscles. 
 Then it becomes a cycle of "I hurt so I can't do the finger puppet show so it hurts so I...." Keep moving. You'll have to adapt, warm ups first, gloves under the finger puppets .... keep moving. 
 
 Nancy
				