[dzolvd]

I use a convertible standing desk, and when standing I don't use arm rests. The key is to have the desk/keyboard at a height where your shoulders hang naturally. I used to have serious wrist issues and switching to the kinesis advantage was the magic bullet for me. Also a big plus for exercises to help, I do back flys to make sure to strengthen the muscles holding my shoulders from rolling forward.

My girlfriend has to use a chair with no arms because of her arm to torso height ratio makes arm rests force her shoulders up. Which I think is the same issue you are facing.