Brachydactyly type D (Clubbed thumb)
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.
Brachydactyly type D is a skeletal condition allegedly caused by a partial fusion or premature closing of the epiphysis with the distal phalanx of the thumb. The condition may either be unilateral (affecting one thumb) or bilateral (affecting both).
A genetic trait, brachydactyly type D exhibits autosomal dominance and is commonly developed or inherited independently of other hereditary traits. The condition is associated with the HOXD13 gene, which is central in digital formation and growth.