I'm missing a knuckle on my left hand, it's my ring finger. One day I put my hand into a fist and I noticed there was no knuckle. My hands functions normally but there's just a gap where my knuckle is supposed to be. Also when I put my hands together the ring finger is shorter than the ring finger on my right hand. I've never hurt my hand before!
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The first knuckle on your finger is typically considered to be the knuckle closest to your hand, where the finger meets the palm.
No, the knuckle is not an immovable joint. It is a hinge joint that allows for movement and flexibility in the fingers.
The knuckle joint is also known as the metacarpophalangeal joint.
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The knuckle joint allows for flexion and extension movements, so bending and straightening the joint. It does not allow for lateral or side-to-side movement.