A thumb was outstretched in the circle of sixth-graders. It had a most peculiar shape, being relatively thin and normal near the base, and then suddenly capped off with a bulbous, short tip, reminiscent of a slightly flattened pearl onion. The thumb belonged to year old me. And I was showing it off proudly among my bemused friends.
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I didn't know there was anything unusual about my hands until I was in sixth grade, sitting on the bus to an away game with the rest of the cheerleading squad. I rested my hand on the back of an eighth grader's seat, which is when she noticed my thumb. You have the same weird thumbs I do," she exclaimed. Well, it turns out I'm one of less than. More commonly referred to as "clubbed thumbs" and often comically called "toe thumbs" delightful! In addition to our thumbs being pretty stumpy, those of us who have clubbed thumbs also have wider-than-average, shorter-than-average thumbnails, and they have no backward arch to them.
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Brachydactyly type D , also known as short thumb   or stub thumb   and commonly referred to as clubbed thumb ,    is a condition clinically recognised by a thumb being relatively short and round with an accompanying wide nail bed as the distal phalanx of affected thumbs is approximately two-thirds of full-length thumbs. It is a type of brachydactyly , or shortness of digits, and is associated with the HOXD13 gene. The condition is known under numerous names.