Funny you say that but when my back is out. (I have not had a fracture or anything like that) Heavy deads will put me back in alinment (bad spelling I am sure)
I asked my Chiro about this and he just looked at me smiled and said hmmmmm interesting
If you’re in good shape, your muscles will becomes very stiff if you cease working out for a little while. I’m sure this is the cause of your back pain flaring up; stiff posterior chain. Stiffness always flares up old injuries.
This happens to me all the time if I don’t have time to work out, but it takes about 2 weeks for me to really become uncomfortable.