A clubbed thumb is a term used to describe the genetic clubbing of one or both thumbs. It is characterized by a particularly short thumb that is round in section and bulbous at the end. The thumb nail is very wide and short. The scientific term for clubbed thumb is Brachydactyly type D or "BDD".
Clubbed thumbs are historically thought of as a sign of royalty. This rare condition was much more common in royal European blood-lines than in the general population and was used as a factor in determining the pureness of the blood.
It is a common trait, aproximately 1 million Americans will have clubbed thumbs. In Israel it occurs in 1.6% of Jews and 3% of Arabs. It is also found a lot in Japan.
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