I agree with alophysio. A lot of time has been spent on your knee with little effect. That begs us to look elsewhere and especially at neurological structures. Once I even has what I swore was MCL/Meniscal type pain only to find that it was coming from my proximal tib/fib joint. I would look there and carefully work on the Lumbar spine, expecially when in pain as hitting (treating) the right spot at the right time should be able to provide instant relief.