Yates, as for the pec injury you have, I did something similar a little over 3yrs ago. I had to lay off chest training for about a month and when I got back to it, I stayed away from flat bench all together for another 3 or 4 months. During that 3-4 month period though was the absolute best chest growth I've ever had before or since. I attribute this to finally prioritizing incline press over flat.
As far as your main topic of the thread, I ran a cycle a little over a year ago where I got a bit of an injury while on cycle...it was 3-4 wks into the cycle of a 16wk cycle...I hurt my back doing deads, using more wight then I should have...funny though, I can throw that same amount of weight around now like it's nothing. Anyway, I had slightly twisted one of my vertebra, 3rd one from the bottom left side to be exact...that might sound bad, but it is not as bad as it sounds and it healed very fast. I ended up only missing 2 days of training, but I did have to adjust my training for the rest of the cycle, which meant no deads and no free bar squats, but I was in the clear to do everything else so as long as it didn't strain my lower back. All in all it worked out fine, after 12wks I was back to regular squats, BTW, I hate smith-machine squats, it doesn't feel right, and after another 2 months I was back to doing deads...and like I mentioned, I was still doing everything else anyway during this "injury" time.
I'll tell you this, the injury did cost me some money, my insurance covered my doctor visits, but I ended up going to the chiropractor to get it fixed, which was not covered...I went and got my back popped and aligned 3x wk for 12wks at $60 a pop
I had always been skeptical of chiropractor's before this, but at that time I was hell bent on doing what ever it took to get back to 100% as soon as I could...and low and behold it worked. After 12wks of the chiropractor, x-rays showed that my vertebra was perfectly in line...the chiropractor was shocked, and so was I, his original diagnosis figured on 6-8 months to get to where I did in 12 wks. I attribute this healing to both me doing exactly what he said as well as a little help from God.