More importantly, the doctor can examine your knee to see if there is any trouble with the joint. My knees make popping noises. There is no pain, and I can move the knees from fully bent to fully straight positions. So do air bubbles that form in joint fluid. The bubbles enlarge and break, creating a symphony of popping sounds.
Knuckle crackers create joint bubbles by putting pressure on the fingers.
With no aches or pain, you can be fairly confident that there is nothing seriously wrong with your knees. Mention it to your doctor at your next visit just to be on the safe side. The arthritis report answers many joint questions. Please allow six weeks for delivery. Dr. Paul Donohue appears Tuesdays.