Hi, I have an impingement in my shoulder, which gets very painful if I need to do a lot of computer work. I bought a vertical ergonomic mouse some months ago, which you hold like a handshake, so much less rotation of shoulder, elbow and writs, and whilst not perfect it's made transcribing my interview data somewhat less daunting. There are a number available, mine was from a company called CSL- Computer and cost just over £10 on Amazon (other retailers available!). I tried a wireless version first, but the batteries ran out v v quickly, so moved to a wired version which works just as well for my shoulder. Good luck in finding something that works. PS Also make sure you have your workstation set up well: having the keyboard at the right height (i.e. adjusting chair height to desk) makes a big difference to me.