"Duran et al. introduced their classification system for post-axial polydactyly in 2015 6. This classification was created as it was felt that the previous systems in use were not comprehensive for coverage of the different post-axial forms."
"Duran et al. introduced their classification system for post-axial polydactyly in 2015 6. This classification was created as it was felt that the previous systems in use were not comprehensive for coverage of the different post-axial forms."
"type I: skin nub without nail or bone elements"
"type II: hypoplastic proximal phalanx"
"type III: proximal phalangeal malformations"
"IIIa: bifid proximal phalanx"
"IIIb: duplicated proximal phalanx"
"type IV: metacarpal malformations"
"IVa: fusion of the metacarpal"
"IVb: bifid metacarpal"
"IVc: duplication of the metacarpal"
"type V: (complicated type) with triplication of the small finger, polysyndactyly, or both"
"The majority of cases are idiopathic. Associations with mutations to the GLI3 gene on chromosome 7 as well as a second locus mapped to chromosome 13 have been implicated in postaxial polydactyly 5."
Expected headings
"Associations"
"Several different classification systems exist for postaxial polydactyly of the hands, including the Pritsch, Rayan and Al-Qattan, and Duran classification systems."