You need to find another doc.I had so much pain in my knee a few years.It was swelled and I could not put much weight on it.my mri and cat scans showed no abnormities.I saw another doc and he said he goes by what his pts.tell him rather than what a test shows.this doc did a arthroendoscopy on my knee and found it full of arthritis,he removed much,and my pain got better.Good Luck
Gloria