Instead of, or in addition to, post-traumatic wrist arthritis, De Quervain's tendinosis seems to fit very well. Particularly the "snapping" or "catching" sensation when moving the thumb. Typing is a bit of a problem, but using the mouse is the real nightmare. I'm trying to take frequent breaks and either immoblize the area or put ice on it at every opportunity. I may need to take a few days entirely off the computer.