Hitchhiker’s thumb (distal hyperextensibility) means your thumb joint is extremely flexible and has an abnormal range of movement.
Myths of Human Genetics: Hitchhiker's Thumb
Do you have the genetics for the Hitchhiker's Thumb?
Distal hyperextensibility.It is a condition (i think) it isn't painful. I'm not sure what on earth it is but i can basically do this with my thumb. It is also known as
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Do you have the genetics for the Hitchhiker's Thumb?
Do you have a Hitchhiker's Thumb?