Anonymous wrote:If it doesn't hurt, it's not serious. I think it's the knee cap not tracking right, and strengthening your quads and hamstrings can help that.
I had it in both knees and this was the cause. One way you can tell is to sit and have someone bend and straighten the noisy knee (so that your leg muscles are not engaging as they would if you moved it using your leg muscles). If there is no noise when your knee bends and straightens without the muscles engaged, you have a quad/ham muscle imbalance that is pulling the cap out of alignment.
I went to PT for a while, but didn't see much difference. You are right on target with a solution - spinning helped immensely.