I think you could be missing some cartilage, if not all. That's what creates the popping, it's just air. Or the beginnings arthritis. I have knee issues as well, but I cheered for 12 years and all the jumping and tumbling did a number on my knees. I also blew them both out at some point.

Yours could be from something else, I'm curious to see what your doctor says. Good luck.

Edited By: SelFish 03/31/2010 11:01 AM. Edited 1 times.