@bbk186 I have had a lot of the same problems as you with the doctors. About 14 years worth. Long story short, I have CPPD. My third Rheumatologist diagnosed it. He looked at old x-rays of my knees and spotted the distinct markings of the crystals that a dozen osteo docs missed. My symptoms were the same as yours, knees down. It's now everywhere since I wasn't treated long ago. My blood tests were normal. It shows up on regular x-rays but you have to mention it as it is easily missed. Good luck.