An operation is not what happens after a diagnosis. It is what happens after a nonsurgical program has had a real run and the hip is still limiting you, which is the order every hip here goes in.
That program is the same one whatever the diagnosis turns out to be, and the hip arthroscopy page sets out what it involves. What matters at this level is what it proves. A hip that quiets down under changed loading, targeted strengthening and time has answered the question: it did not need an operation, and only time in treatment could have shown that. A hip that keeps catching, keeps swelling, keeps giving way, or keeps you off the thing you actually want to do has answered it the other way.
Imaging enters at that point rather than ahead of it. An x-ray reads the shape of the bones and the room left between them; an MRI is what shows a torn rim or a worn patch of surface cartilage. Neither one books an operation by itself. A finding that matches what the exam reproduces is a reason to operate. The same finding in a hip that feels fine is a picture, not a problem, and plenty of people carry one without knowing.
The last part of the decision is a conversation rather than a scan. Before a date is set you should have heard what the operation is meant to correct, what it will not correct, how long the leg will be protected afterward, how long rehabilitation runs, and what the plan is if the hip does not settle. That is the discussion worth having in full, and it is the one this page exists to get you ready for.