Most of the time this is how the process goes. "Patient goes to primary care physician and has back pain. PCP orders x-rays and which will show nothing most of the time other than a little wear and tear, they will then refer you to a Spine Specialist MD or directly to PT. When you go to Ortho MD they will look at the x-rays and say you have some wear and tear (normal at 55 years old) so they then may order an MRI. In the mean time why dont we try PT, chiropractic, medications, injections, massage, or any other host of modalities."
As you imagine this can be a lengthy process and drives health care costs up. Why see two MD's and recieve no treatment when you can see 1 PT and get a durable fix? I am not saying there is no vaule in getting an MD's opinion on this, however many PT's now have doctoral level training and are truly the experts in DIAGNOSING and TREATING many spinal pathologies. Pennsylvania, and all 49 other states to some extent, have direct access laws which allow PT's to treat patients without a referral. This is a soapbox item for me so I apologize for the lengthy response.
It sounds like a lot of people on this forum should be looking for a quality PT to work with. Best of luck!