Picking up from what sno said and adding; you can skip through stuff you have already commited to your head. Don't spend time going through learning the G chord if you already know it. However, if you're still physically getting used to the guitar and the injury you had affected your ability to play. certainly work through the more drill oriented lessons.

Don't get hung up on re-covering everything if you don't need to but hit up those things that may not be strongly built in to your playing yet (or might help rehab your playing).