I know the same problem.

Two weeks ago after 20 minutes playing rugby my right shoulder went out is place, so I managed my left hand to work as same as possible like my right hand do, but my pen don't want to draw something.

I turned my mouse for left hand user, and the same problem every thing goes wrong. since monday I had recovered my shoulder but till I can't draw someting well (MAYA and paper)
That's why i can't post WIP...