Okay, you can't squat or deadlift because of injury, fair enough.
But you really need a way to strengthen your back, your routine is very unbalanced in that area. You could try one-legged squats or hip belt squats, 1 arm dumbbell rows, back raises, and leg curls. Alternate that with your other day of leg presses, leg extensions, etcetera. A strong back is a healthy back!
Like I mentioned earlier, 5x5 is a good, proven system for building size and strength. There is really no reason to switch that out for something different right now. If your lifts are increasing and your weight is rising, then just stay with what you have. Trust in the process.
Last edited by Off Road; 03-06-2013 at 08:56 AM.