Assertion: knuckle | /r/HasProperty | cracked
Facets:
value: newly
type: MANNER
Source sentences:
text: Joint "cracking" can result from a negative pressure pulling nitrogen gas temporarily into the joint, such as when knuckles are "cracked.
text: When a knuckle is cracked, the stretching of the capsule decreases the pressure joint pressure and creates a vacuum which is filled by the gas previously dissolved in the synovial fluid.
text: To work out what was happening when knuckles are cracked, the team looked at ten finger joings, inserting them one at a time into a tube connected to a cable that was slowly pulled until the knuckle joint cracked.
text: In the 1940s, researchers used X-rays to analyze the movement of the bones as a knuckle was cracked.
text: The theory made a certain amount of sense, especially since a knuckle that has been newly cracked cannot be re-cracked for an average of 20 minutes, suggesting that the bubbles have been popped and must first re-form.
text: This was challenged 40 years later when new experiments showed that bubbles persist in the fluid long after knuckles have been cracked.
text: Thus, tiny bubbles can hang around in the joint fluid after the knuckle has been cracked.
text: What scientists have agreed upon, however, is that knuckle cracking is not something everyone is able to do, not every finger can produce the popping sound, and it takes about 20 minutes before a knuckle can be cracked again.
text: This theory was first proposed by scientists from the University of Leeds in 1971, but in 2015, a PLoS One paper led by Greg Kawchuk from the University of Alberta’s Faculty of Rehabilitation Medicine used MRI scans to show that gas bubbles remained in the fluid even after the knuckles were cracked.
text: This was challenged 40 years later when new experiments showed that bubbles persist in the fluid long after knuckles have been cracked.
text: Thus, tiny bubbles can hang around in the joint fluid after the knuckle has been cracked.
text: A mathematical model now explains that it is the collapsing of bubbles or gas pockets present in the synovial fluid in joints that causes the sound when knuckles are cracked.
text: The images showed a sudden appearance of a bulge in the knuckle as it is cracked.
text: When the knuckles are cracked, the bubble inside the fluid burst which cause snapping, or other annoying sounds.
text: When the gases present in the fluid are suppressed, a bubble forms and bursts which causes the popping sound when knuckles are cracked.
text: What scientists have agreed upon, however, is that knuckle cracking is not something everyone is able to do, not every finger can produce the popping sound, and it takes about 20 minutes before a knuckle can be cracked again.
text: This theory was first proposed by scientists from the University of Leeds in 1971, but in 2015, a PLoS One paper led by Greg Kawchuk from the University of Alberta’s Faculty of Rehabilitation Medicine used MRI scans to show that gas bubbles remained in the fluid even after the knuckles were cracked.