Have you seen an ortho? Try that, shoot some x-rays of your knees, see what they say.
My PCP said I had a bakers cyst, sent me to ortho surgeon. Shot film, left knee is going to need replaced 3-4 years. That's now. But, I did have a torn miniscus in the left knee. So what did I do 2 weeks later? Tore the right knee. I've got a matching set now. But I'm 63, that makes a difference, I guess.
The docs like to start with the cortisone shots first. Some times they do help. Then they move to the really expensive stuff for knee shots. So expensive the insurance companies have fits. That stuff really helps.
So if you decide to do the shots, ask the doc to spray it really well with the freezy stuff. It's a temporary freeze, you don't feel the needle going in, just a bit of pressure. It's really not too bad, and I'm a BIG wuss when it comes to needles.