Articular means of a joint — the surfaces, the space between them, and the motion they already have, not a diagnosis that something is out.
In this library 📝Articular Mobility uses the word so the work is named accurately without borrowing licensed vocabulary. It is anatomy language, not a synonym for adjustment, and not a claim a bone needs to be put back. The aim is easier motion through the range the joint already has.
Clients hear articular as "we are working with the joint," not "something is wrong with the joint."