I would give it a go (although I am warning you, injections in the knee "can" be painful, it depends on where they stick you). I got a steroid once right below the patella. Man, that hurt!

But don't want to scare you!

I would try anything, if I were you, before resorting to surgery. That should be your last step.

I did have knee-hole (edit: I meant "peep-hole" LOL) surgery on my right knee. And I woke up with a greyish/black leg, toes to hips. This was when I already had CRPS.

This is why they won't touch the left one.

Debris needed to come out due to my initial injury. The right knee was *super* painful because debris had "gone wild" in it. The left is do-able, but still, I have the patella pain.

Good luck, whatever you decide!