Why do knees knock together?

Have you ever wondered why knees or joints in general pop.
Knuckle cracking is a common phenomenon, but as long as it doesn't come with pain, the noise is nothing to worry about.
Certain supplements containing nutrients for joints can be very beneficial for maintaining their long-term health:
A big stress on the knee comes from uncomfortable high-heeled shoes. So sometimes it's best to choose between healthy low-heeled shoes, or spectacular high-heeled ones.
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