Brachydactyly type D

Abnormal shortening of the distal part of the thumb

Brachydactyly type D, also known as short thumb, stub thumb, or clubbed thumb, is a genetic trait clinically recognised by a thumb being relatively short and round with an accompanying wider nail bed. The distal phalanx of affected thumbs is approximately two-thirds the length of full-length thumbs. It is the most common type of brachydactyly, or shortness of digits, affecting approximately 2–3% of the population, and is associated with the HOXD13 gene, located on chromosome 2q31.1.

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