Linked by Thom Holwerda on Mon 12th Jul 2004 08:45 UTC
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Trackballs do not produce less strain on your arm and shoulder. Using a trackball can actually cause more strain, because strain on your thumb gets multiplied onto your wrist and arm.
For a real ergonomic solution to mousing, you are better off going with vertical mice. They are manufactured by Designer Appliances (The Quill) and Evoluent (Evoluent VerticalMouse 2, which is coming out in July).
http://www.quillmouse.com
http:?/www.evoluent.com