Well, you need to narrow it down to structural or nerve as a cause, or lyme, some more detective work on your end can help figure this out. Ifs its only from lyme then theres not much but time on your side (but you run too dont forget). All runners have some type of pain in there life.
Since you've been here a while, have treated lyme, did it change you knee pain? Most lyme joint issues also have obvious inflammation. So since you dont know if its only lyme or other issues, make use of your time and experiment to rule out non-lyme causes, since you have to wait for lyme anyway.
Is it IN the knee or around it? What limits the bending? - tightness, or sharp pain (so your brain tells you to stop)? It can be a combination to.
As a structural test- Tightness can be figured out by deep massage or aggressive poking-proding adjacent areas.
When my knee hurts its from tension by my inner adductors muscles. Many runners have outer IT band issues pulling on the upper TFL and then the knee on the low side. Very common.
The knee has to float in its position tension free for no pain. Pulled out of place from attaching muscles will make it hurt.
No self luck? - then I'd suggest finding a chiro ot PT who does manual soft tissue work (literally hands on). Just cracking wont solve mysteries- avoid those chiros.
I think a lot of athletic people have structural issues already and lyme just makes it worse. Before ABX, I over dosed on NSAIDS (per drs) and iced a lot. Helped but only temporary, and gut an ulcer from NSAIDS later.
Post Edited (astroman) : 4/15/2017 11:10:20 AM (GMT-6)