Last year right around fall I started having pain on the inside of my right knee. The pain was so bad I basically had to pedal around using one leg. I stopped riding because it got winter, and since I have never had problems with my knees before so I didn't pay much attention to it. Throughout the winter I was on the trainer and I had no problems with my knee. Right when it was starting to get warm I had a professional bike fitting just to make sure I fixed the problem for good. However, when it was finally warm enough to ride outside. I had the same exact problem.
I went back to the fitter to try and figure it out and we made some small changes and added inserts to the shoes thinking that the pain might be from my flat feet.
Had the same exact problem again.
Today I started thinking that the cleat placement, shoe, or pedal might be causing the pain so I figured going to flats might help. I decided to test my theory with a bike commute to work. It felt good until mile 10 or so, and the dreaded pain came back. By the time I had to ride home I was limping to go 10 mph, and on slight inclines I was at about 6 mph...
The weirdest part is the knee doesn't hurt at all when I'm not on the bike!!!!!
I'm just extremely frustrated, and if someone could read that rambling and has had a similar experience please let me know what helped you!
Edit: I'm 24 so it isn't old age creeping up on me