As you pull on the joint, you first drop the pressure in the joint space - and the ligaments get sucked in. There is a liquid in this space, and there are ligaments on each side, holding the bones together. The joint space is the space between the bones. They found that there wasn't just one single sound when you cracked a finger joint - there were actually two separate sounds. Some scientists wanted to learn more about knuckle cracking, so they actually stuck a sensitive microphone onto a finger. (You will need Real Audio which you can download for free)īud rang in to ask, "What happens when you crack your joints, and is it bad for you?" Listen to Karl talk about Knuckle Cracking Science Home News in Science In Depth Dr Karl TV & Radio Games Teachers Kids Get Involved Video Audio Photos RSS/Pod
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