Ultrasound Reveals Knuckle-Cracking Fireworks

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Research presented at the 2015 annual meeting of the Radiological Society of North America (RSNA) tackles one of life’s great mysteries: what causes a knuckle to “crack” out loud? …

Knuckle-cracking…In the first study of its kind, researchers recorded simultaneous audio and visual evidence of knuckles cracking. Forty healthy adults, including 17 women and 23 men (age range 18-63), were examined at UC Davis with ultrasound imaging, as they attempted to crack the knuckle at the base of each finger, known in medical parlance as the metacarpophalangeal joint (MPJ)…

…Using a small transducer, a sonographer recorded video images of 400 MPJs, as participants attempted to crack their knuckles. The sonographer also captured static images of each MPJ before and after participants tried their hands at cracking…

Read the entire article here …

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