‘When you do that, you can see very clearly what is happening inside the joints.

“当你用核磁共振观察的时候，你可以非常清楚地看到关节内部发生了什么。

‘It is a bit like forming a vacuum.

“它像是形成了一个真空。

‘As the joint surfaces suddenly separate, there is no more fluid available to fill the increasing joint volume, so a cavity is formed and that event is what is associated with the sound.’

“当关节接合处突然分开，液体无法流入不断增大的关节真空处，因此形成了一个气泡，这就是响声的来源。

The scans also showed a mysterious white flash occurs just before the noise is heard.

扫描仪还显示，就在听到响声之前有一道神秘的白光闪过。

Further research is needed into this streak of light – and why the cracking sound is so loud.

为什么会出现这道白光，以及为什么掰指关节会发出这么大的声音，还有待进一步研究。

However, the researchers are happy to have shown that the noise is created when a bubble forms inside the knuckle.

不过能够向众人展示响声的背后是指关节内部的泡泡，研究人员已经很高兴了。

Although this was first suggested more than 100 years ago, recent thinking has been that the crack is created when a bubble bursts.

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