Question

Why can we snap our fingers?

Answer 1

snap = The clicking sound some get when they press their knuckles.

Answer 2

Here's something for a start: http://en.wikipedia.org/wiki/Cracking_joints
Can anybody give something solid.

Answer 3

Well the 'Synovial fluid cavitation' part on the wiki link you gave seems to have a good reference. I'm pretty sure I've heard that reason elsewhere aswell.

Answer 4

the Synovial fluid cavitation is the reasoning i've heard of most when discussing with fellow physicians.

Answer 5

snapping your fingers is a noise created by the impact of your finger against your skin. Cracking your knuckles is a bit more biological.

Answer 6

We were told about tendons in medical school.