扳指关节时关节内发生了什么-凯发k8官网

扳指关节时关节内发生了什么
文章来源:未知 文章作者:enread 发布时间:2015-04-16 05:25 字体: [ ] 
(单词翻译:双击或拖选)
"pull my finger," a phrase embraced by school-aged kids and embarrassing uncles the world over, is now being used to settle a decades-long debate about what happens when you crack your 1. in a new study published april 15 in plos one, an international team of researchers led by the university of alberta used mri video to determine what happens inside finger 3 to cause the 5 popping sounds heard when cracking knuckles. for the first time, they observed that the cause is a cavity forming rapidly inside the 4.
 
"we call it the 'pull my finger study'--and actually pulled on someone's finger and filmed what happens in the mri. when you do that, you can actually see very clearly what is happening inside the joints," explained lead author greg kawchuk, a professor in the 6 of 7 medicine.
 
scientists have debated the cause of joint cracking for decades, dating back to 1947 when u.k. researchers first theorized vapour bubble formation as the cause. that was put in doubt in the 1970s when another team of scientists instead fingered 8 bubbles as the cause.
 
the idea for the project was born when nanaimo chiropractor jerome fryer approached kawchuk about a new 2-cracking theory. they 9 to skip the theories and, with u of a colleagues jacob jaremko, hongbo zeng, richard thompson and australian lindsay rowe, decided to actually look inside the joint.
 
but to find an answer, the team needed someone capable of cracking knuckles on demand--a job that fell to fryer himself. kawchuk said most people have the ability to crack their knuckles, but unlike most, fryer can do it in every finger, and after the standard recuperation time, he can do it again.
 
"fryer is so gifted at it, it was like having the wayne gretzky of knuckle cracking on our team," says kawchuk.
 
fryer's fingers were inserted one at a time into a tube connected to a cable that was slowly pulled until the knuckle joint cracked. mri video captured each crack in real time--occurring in less than 310 milliseconds.
 
in every instance, the cracking and joint separation was associated with the rapid creation of a gas-filled cavity within the synovial fluid, a super-slippery substance that lubricates the joints.
 
"it's a little bit like forming a vacuum," kawchuk said. "as the joint surfaces suddenly separate, there is no more fluid available to fill the increasing joint volume, so a cavity is created and that event is what's associated with the sound."


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1 c726698620762d88f738be4a294fae79     
n.(指人)指关节( knuckle的名词复数 );(指动物)膝关节,踝v.(指人)指关节( knuckle的第三人称单数 );(指动物)膝关节,踝
参考例句:
  • he gripped the wheel until his knuckles whitened. 他紧紧握住方向盘,握得指关节都变白了。
  • her thin hands were twisted by swollen knuckles. 她那双纤手因肿大的指关节而变了形。 来自《简明英汉词典》
2 r9qzw     
n.指节;vi.开始努力工作;屈服,认输
参考例句:
  • they refused to knuckle under to any pressure.他们拒不屈从任何压力。
  • you'll really have to knuckle down if you want to pass the examination.如果想通过考试,你确实应专心学习。
3 d97dcffd67eca7255ca514e4084b746e     
接头( joint的名词复数 ); 关节; 公共场所(尤指价格低廉的饮食和娱乐场所) (非正式); 一块烤肉 (英式英语)
参考例句:
  • expansion joints of various kinds are fitted on gas mains. 各种各样的伸缩接头被安装在煤气的总管道上了。
  • expansion joints of various kinds are fitted on steam pipes. 各种各样的伸缩接头被安装在蒸气管道上了。
4 m3lx4     
adj.联合的,共同的;n.关节,接合处;v.连接,贴合
参考例句:
  • i had a bad fall,which put my shoulder out of joint.我重重地摔了一跤,肩膀脫臼了。
  • we wrote a letter in joint names.我们联名写了封信。
5 es5xr     
adj.特别的,有特色的,与众不同的
参考例句:
  • she has a very distinctive way of walking.她走路的样子与别人很不相同。
  • this bird has several distinctive features.这个鸟具有几种突出的特征。
6 hhkzk     
n.才能;学院,系;(学院或系的)全体教学人员
参考例句:
  • he has a great faculty for learning foreign languages.他有学习外语的天赋。
  • he has the faculty of saying the right thing at the right time.他有在恰当的时候说恰当的话的才智。
7 8vcxv     
n.康复,悔过自新,修复,复兴,复职,复位
参考例句:
  • he's booked himself into a rehabilitation clinic.他自己联系了一家康复诊所。
  • no one can really make me rehabilitation of injuries.已经没有人可以真正令我的伤康复了。
8 6becc10b3eacfd79485e188c6ac90cb2     
压扁[平],毁坏,断裂
参考例句:
  • rescuers used props to stop the roof of the tunnel collapsing. 救援人员用支柱防止隧道顶塌陷。
  • the rocks were folded by collapsing into the center of the trough. 岩石由于坍陷进入凹槽的中心而发生褶皱。
9 lvqzzd     
adj.决定了的,坚决的;明显的,明确的
参考例句:
  • this gave them a decided advantage over their opponents.这使他们比对手具有明显的优势。
  • there is a decided difference between british and chinese way of greeting.英国人和中国人打招呼的方式有很明显的区别。
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