I have had bad knee pain for over four years with no relief. I have done two rounds of physical therapy, custom orthotocs, and two rounds of orthovisc injections. Nothing has worked. I can no longer run, or ride mu bike. My knees hurt when I sit, stand, walk, basically everything. I was told I had patellofemoral syndrome, and then they said patellar tendonitis because nothing worked. But my MRI and xrays didn t show anything they deemed helpful. Any help I get would be appreciated