This forms a big bubble that causes a loud “pop” when it collapses, which in turn dissolves the gas in the liquid again.( 4)Ī perfect example of this would be when we crack our knuckles. Moving or stretching our joints can pull the dissolved gas molecules together. It also reduces friction from everyday movement, keeping our joints and cartilage healthy. It’s made of water, lubricants, and dissolved gas molecules.( 3) The synovial fluid is a viscous liquid inside some of our joints, like the knee. Here are some common reasons why healthy knees crack: What causes knees to crack and pop? 1. It’s nothing to worry about as long as it’s painless and it doesn’t restrict your range of motion. These are usually due to bubbles within the joint or tissues rubbing against each other.( 1, 2) Studies suggest that 99% of knees make noises.
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