Chiropractic in the US refers exclusively to the practice of musculoskeletal manipulation and “adjustment”. Yanking on and twisting joints to get them back into the “right” position. It can work in specific circumstances, but can also further exacerbate some conditions. Someone who is only a chiropractor typically does not or is not allowed to administer invasive procedures such as the cortisone or lidocaine shot that I assume you got. That’s reserved for actual doctors here. Sounds like the person you saw would be more likely be a physiatrist or physical therapist in the US.

Basically chiropractic is a separate education/licensing process, and requirements vary by state. Most states, for instance, don’t require chiropractors to carry malpractice insurance. That means if they put you in a wheelchair, they declare bankruptcy and start a podcast or become a personal trainer or some shit, and you get to battle them in court while in crippling pain, and then max out your insurance deductible every year for the rest of your life. People who practice chiropractic may have additional qualifications and licenses allowing them to write prescriptions and do minor invasive procedures such as injections, but that’s not too common.