As Tim mentioned, I wonder what we're considering an "injury." I'm very much in the still learning ukemi phase, being only three months into my training, and I've certainly woken up sore the next day a few times from ukemi: neck/shoulder stiffness from snapping my head back on tenchinage, sore shoulders from standing rolls.
I'm just not sure those count, as they clear up after a few days off the mat. That's pretty much what I was advised to expect at first, until I get more rounded. I'll just keep working on my beer waza, that'll make me more round, right?