As most of us have figured out by now, most MDs are pretty much at a loss to diagnose and treat pain. You may see 3 different docs and get 3 different opinions on what is wrong; you can get an X-ray or an MRI and someone will say "you have torn cartilage!" or "you have arthritis!" but the reality is that imaging does not diagnose pain. At all. Rarely.
There is a great study that came out several years ago re back pain: 100 people with awful, intractable back pain underwent MRI...30 of them had herniated discs. Then 100 age-matched people who had never had back pain in their lives - ever - had MRI...guess what? 30 of them had herniated discs.
I have patients all the time who had meniscal tears (aka cartilage tears) in their knees repaired or cleaned out...and their pain post operatively was the same as before...taking care of the meniscal tear did not end the pain; this has also been documented in the literature.
Osteoarthritis researchers are actively looking for a way other than X-ray to stage disease severity because we are finding very little if any correlation between the patients pain and function and X-ray findings.
Moral of these stories? Imaging is HORRIBLE as a diagnosis for pain. It may show a structural problem, but that does not AT ALL necessarily mean that is what causes your pain. Why do you think so many back surgeries fail? Because the surgeon fixed the structural deficit...but that was not the cause of the pain.
I have been studying the science of pain (neurophysiology) for a number of years and the best advice I give my patients is to be very, very wary of diagnoses. I know you want one, you want a label...I get that. And sometimes you need one because you can then be treated medically (ie rheumatoid arthritis is a very specific condition that requires different kinds of medications - it is an auto immune disease basically). But if your problem is simply pain, I guarantee your md called it "arthritis," maybe gave you a pill or two, told you to exercise or do whatever, and sent you on your way.
Telling people they have these structural deficits, in my professional opinion, generally does more harm than good. So much of pain is mental (it is your brain, after all, that decides if a feeling is a good one or a bad one...good pain vs bad pain, etc) and if you think something is "broken" it absolutely will hurt more than if you don't think that.
Anyway...my two cents on a terribly difficult, ridiculously complicated topic that unfortunately too many clinicians don't understand.