I've had a mysterious right-lateral knee injury for about two months. I don't know what caused it and have been unable to pin down a diagnosis. It hurts most when I run up stairs (walking up is fine) or attempt a single-leg hop, two activities which essentially are the same movement and which, to a lesser degree, mimics running. Obviously I try to avoid these movements. It's really not painful otherwise.
I also have something else going on: sometimes, if I stand up and squeeze my adductors, my sacrum has a "good" pop. No pain.
Any idea if these two things could be at all related?