|Brachydactyly type D|
Top view of a child with asymmetric brachydactyly type D thumb.
|Classification and external resources|
"Clubbed thumb" is a misnomer for stub(by) thumb, known clinically as brachydactyly type D, or BDD. BDD is a harmless genetic trait characterized by the last bone of one or both thumbs being short and round with an accompanying short and wide nail bed.