Hi . Sorry you have this ongoing pain and diagnostic issues. The good news is the no signs of erosion or deformity. As said, seronegative RA is very real thing and tough to diagnose. As said, there are other conditions, such as ankylosing spondylitis or fibromyalgia (just to name two), that can also potentially be a cause of this joint pain. You mention the tests, have you been seen by a rheumatologist? I ask because rheumatologists have specialized training in the diagnosis and treatment of diseases that affect the muscles, bones, joints, ligaments, and tendons. Hoping you can get some answers and relief soon. Best, Richard (RheumatoidArthritis.net Team)