Knuckles

Tom doesn't like it when Mary cracks her knuckles.

Tom skinned his knuckles.

Tom cracked his knuckles.

Stop cracking your knuckles.

I heard Tom cracking his knuckles.

That dish with salted pork knuckles is Swiss cuisine.

Tom knocked his knuckles against Mary's.

Tom says he heard Mary cracking her knuckles.

Is cracking your knuckles bad for you?

Cracking your knuckles will give you arthritis.