This is fact. Please see the below.
https://youtu.be/Ns91jtuPHZI?t=16
Chiropractors deploy various techniques depending on your situation. It's not always about "cracking" your back. Mine has even done acupuncture where he attached a tens machine to the needles. Your initial consult should include x-rays. If it doesn't, don't let them touch you. I was afraid of seeing one at first, but when you're in tremendous pain, you'll do what you have to do to get relief. It's worked for me for many years now.