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Mine crack too. Makes all my friends a little sqimish.:( I've been to the doc a couple of yrs ago about this problem. He told me it has to go with our shape , with being a female and all. In my teens I had really muscular thighs. After a while of not being as active they deteirorate. Your knee cap rubs against your thigh bone and eventually causes a bit of pain. He suggested that I start some weights, gave me a gaint blue rubber band to strenghten that muscel. This is common with women. Hope this helps.
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