Videos | Ultrasound Imaging | December 07, 2015

Ultrasound of Knuckle Cracking Shows Energy Burst

Research presented at the Radiological Society of North America (RSNA) 2015 meeting. In the first study of its kind, researchers recorded simultaneous audio and visual evidence of knuckles cracking. The images showed a bright flash on ultrasound, like a firework exploding in the joint, an unexpected finding. There have been several theories over the years and a fair amount of controversy about what is happening in the joint when it cracks. Researchers believe the cracking sound and bright flash on ultrasound are related to the dynamic changes in pressure associated with a gas bubble in the joint. As for which comes first — the cracking sound or the flash of light — more research is needed. Read the story 

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