What Causes Knees to Crack?

Answer

What causes knees to crack and pop when you move is called crepitus. This is generally the movement of the patella or kneecap back into its normal position. The movement and rubbing causes the noise.
Reference:
Q&A Related to "What Causes Knees to Crack?"
Sometimes the knees just pop for no real reason. If it is a problem, or causes pain it could be a cartilage issue with the knees. Other times it can be deterioration.
http://answers.ask.com/Health/Diseases/why_do_my_k...
I'm not a doctor, but both my knees crack constantly as long as I can remember. I was told many years ago that I had bilateral plica syndrome. If you look that up, it does mention
http://wiki.answers.com/Q/What_syndrome_causes_you...
Your knee joint contains a very slippery liquid called synovial fluid to lubricate and cushion the cartilage and bones. This fluid also nourishes and keeps the joint healthy. Symptoms
http://www.ehow.com/facts_5486581_causes-fluid-kne...
growing bones can be one cause which is normal and will stop eventually.
http://uk.answers.yahoo.com/question/index?qid=201...
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Knee cracking is believed to be caused by a change in pressure in fluids found in the joints. It produces a loud sound and it's usually painless. Many people think ...
Sometimes the knees just pop for no real reason. If it is a problem, or causes pain it could be a cartilage issue with the knees. Other times it can be deterioration ...
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