02 2016 Jun
New study confirms what really happens when you crack your knuckles

New study confirms what really happens when you crack your knuckles

Scientists have used ultrasound machines to figure out exactly what’s going on in our joints when we crack them, putting an end to a decades-old debate about where that distinctive cracking sound comes from.

Back in April, researchers from the University of Alberta published a paper based on MRI imaging of finger joints being cracked saying that the popping sound is caused by the collapse of air bubbles that form in the fluid that surrounds our joints - called synovial fluid. But ultrasound machines can record what’s going on inside our bodies up to 100 times faster than MRIs, so another team of scientists decided to investigate this claim further.

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