On an occasional basis I am familiar with a pain around the knees. It´s a very unimportant symptom for me.
Sometimes I get pain inside one knee from climbing the steps, but this as well is no major concern.
However, the first one I now relate to my pyrimadal system in the brain - it´s somehow speculative enough though.
After I took stupidly one single time an antipsychotic I can feel my pyramidal system, and if there would be to many connections inside this system instead of more connections to the other regions of the brain, I can get this pain around the knees.
Here I think - because I can influence this by an anticholinergic (a spoon of tomatoegreentea, without pesticides - in each drink) ... In my case what helps in addition is an intake of silver, chromium and occasionally zinc, to say it roughly.
I personally use almost homeopathic watersolutions, but they might work only because I am improving from a low manganese diet which makes me very sensitive to bad influences (and good ones too). It´s a very slow and difficult improvement over years however, but thanksfully significiant.