Tis more interesting than that. ....both my thumbs bend backwards 90 degrees each way for full 180 degree motion
It's called distal hyperextensibility
Its awesome.
Especially for snooker.Steve Davis had it as well.
Hitchhiker's thumbs
"Hitchhiker's thumb" is an autosomal recessive trait more formally known as "distal hyperextensibility of the thumb".
Homozygous carriers can extend the top of the thumb backwards nearly 90° when the thumb is extended in a "thumbs-up"
Cases of Hitchhiker's thumb are subject to a variation in range of motion.
Some who have this condition are able to hyperextend thumbs backwards 90° while still able to bend thumbs forward partially or with an added normal forward range of motion. T
Those with a more traditional case of Hitchhiker's thumbs can hyperextend backwards 90° while unable to bend past a straight position of the thumb.
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