title: [The triphalangeal thumb].
abstract: A theory about formal aetiology of triphalangeal thumb is emphasized. All teratological grades of triphalangism of the thumb associated with preaxial polydactyly or reduction abnormality of the thumb are to be submitted to our diagram of thumb malformations.
mesh_terms: D005385:Fingers / Q000002:abnormalities; D006801:Humans; D008953:Models, Anatomic; D013933:Thumb / Q000002:abnormalities*
vernacular_title: Der dreigliedrige Daumen.