Clubbed thumb

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Brachydactyly type D
Clubbed thumb.jpg
Top view of a child with asymmetric brachydactyly type D thumb.
Classification and external resources
eMedicine I/'
Side view of a child with asymmetric BDD

"Clubbed thumb"[citation needed], stub thumb, potter's thumb, bohemian thumb, royal thumb, trolls thumb, dinosaur thumb, or murderer's thumb[1] are historically colloquial names likely associated with the genetic trait known as brachydactyly type D or BDD. [2] BDD is the classification of a skeletal formation found in one or both hands marked by an abnormally short and round thumb with an accompanying short and wide nail bed. BDD exhibits autosomal dominance and is developed or inherited independently of other hereditary traits.

While the origin of the name "clubbed thumb" is unknown, the condition commonly associated with it should not be confused with digital clubbing,[3] which is a "clinical sign associated with a number of diseases."[4]

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