My initial reaction was similar to dream'n, but after reading the post the OP wasn't particularly whiny, was just looking for options to meet his limitations. No "woe is me, the world is unfair" to be found, move along people. I work in a mixed ICU, we do open hearts, LVADs, neuro, CRRT, the usual mixed bag. I can honestly say with the current charting requirements for the position I am sitting at a computer documenting 40-50% of my shift. I am permanent charge so my number is slightly skewed, when not in charge probably about 30-40 % of time is documentation.
Hope this helps OP, good luck with your back.