Keyboard Angle Issues
and there's also wrist dorsiflexion, meaning bending up the palm. This happens when you use a thick keyboard that sits on a flat desk and your forearm rests on the desk surface. Especially bad when the keyboard's back legs are propped up. This is solved by typing while your wrist hovers above, which is actually the proper typing posture. It is also solved by putting ~5cm thick book in front of the keyboard, or a front tilt as in Microsoft 4000, or a dipped-in keys as in Kinesis Contoured Keyboard, or set your keyboard in a tray below desk surface.