knee popping/cracking during squats?

[artrius]

I've recently started doing them again, ATF, about shoulder witdth apart (maybe a little wider), and on the way down, right past parallel as well as on the way back up at the same place, my knees pop or crack. Its like cracking your knuckles, and its rather uncomfortable. What is unusual, though, is that there is some knee pain associated with this. What do you suggest?

 

[Lee]

getting a doc to check it out. once you fuck your knees theres no going back, so dont risk it. then again, it could just be the cartilidge adjusting to the stresses put on it.