Bro,
I'm still recovering from Knee surgery on my right leg. On the advice of my coach, I've been training my left leg hard since one week after the surgery-and the strength loss in my right leg has been almost negligable. Size loss, while still present, has been minimal as well. Training one side will help maintain your hormone levels, which will in turn induce growth in the lame limb as well as the strong one.
Training whatever you can during an injury is always the best idea.
Good luck bro.