Undergrip rows, hmm. I am afraid of winny for reasons like this, although thankfully I don't compete.
Don't know what to say man, get well soon - and I am curious what are they going to do to help you procedure wise? How do they re-attach that stuff?
Hope you can get back in the gym soon, supposedly working out the opposing side of the body helps keep the rest of the body from losing as much mass as normal...