Not much research has been done on the epidemiology of<unk> s. There are a few reports on the incidence in their respective studies. The most recent data comes from a Japanese study by Kukichi and Ogino where they found an incidence 3.3<unk>  thumbs per 1,000 live births in 1-year-old children.
Congenital trigger thumb
Congenital clasped thumb
Adducted thumb syndrome
Mallet finger
Blue toe syndrome
Congenital contractural arachnodactyly
Hypothenar hammer syndrome
Radial dysplasia