I can only relate my own experiences with Chiropractic. Some 50 or years ago I was experiencing some back pain, which I tried to ignore, until one day as I reached out for the telephone on my desk at work I suffered an agonising pain in my lower back so bad that I actually fell out of my chair. I found I couldn`t use my lower limbs, and my secretary drove me home, I lying along the back of my estate car. My wife called my doctor, who, in turn, brought the local Chief Orthopedic surgeon, who gave his opinion that surgery on my spine would probably be required, but first I should spend a few weeks in hospital having my spine stretched followed by a spell wearing a surgical corset. However, I remembered that an acquaintance had been successfully treated for back trouble by some magical pratitiioner, and my wife telephoned him, and he recommended the Chiropractor who had treated him. My wife telephoned the Chiropractor (Saturday) and got an appointment for Monday, and I was taken in the estate car, the Chiropractor x-rayed my back on his own machine, and showed me the problem, then spent 15 minutes manipulating my spine, after which I was able to walk out to the car and travel in the front passenger seat.
I had further manipulative treatments on the Wednesday and Friday of the same week, after which I was more or less back to normal with a few simple exercises to perform for a week or two.
Since then the problem has re-occurred (but much less severely) a half dozen times, and on each occasion two or three sessions, first with that Chiropractor, then his successors, have always sorted the problem.
However, I discovered that there are now several sorts of Chiropractic which do NOT employ manipulation - I once used one without realising the difference, and I found these a complete waste of time and money.