I know Microsoft is a bad word but I use a Microsoft Trackball Explorer. I liked the original one more, but the new one isn't bad. I've had arm/wrist problems for years because of the mouse. The only thing that's worked is a trackball where I can use my fingers to move the ball and my thumb only pushes buttons. This trackball never makes my wrists hurt, though typing too much still will. I also use a Microsoft split keyboard, the "normal" keyboards make my arms almost completely useless after a few hours.
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I know Microsoft is a bad word but I use a Microsoft Trackball Explorer. I liked the original one more, but the new one isn't bad. I've had arm/wrist problems for years because of the mouse. The only thing that's worked is a trackball where I can use my fingers to move the ball and my thumb only pushes buttons. This trackball never makes my wrists hurt, though typing too much still will. I also use a Microsoft split keyboard, the "normal" keyboards make my arms almost completely useless after a few hours.