Injuries and setbacks will always occur. You have to see past them and not focus directly on them. They will subside. But if you focus on them, when they subside you will be right where they brought you. At a stand-still. See past them. Work through them and when they subside you will have still progressed and you'll have to turn all the way around to look back at them. 

My recent neck injury has left me with little strength and some pain in my right shoulder, trap and tricep. I've had to work around it. I'm taking this opportunity to try some higher volume training. 10 Giant Set of three chest/shoulder movements in 30 minutes. Allowing the weaker arm to fixate the weight. I go to failure. I should continue to progress. Same thing occurred when I was in Phoenix. Sciatic nerve compression left my right leg limp. It's gone now. I continues to train legs. I did not regress. And the injury is just amemory. 

Setback will always occur. Progress will only occur if you see past the set back.