Presentation
Any evidence of rheumatoid arthritis in a patient with bilateral polydactyly.
Patient Data
Bilateral bifid fifth metacarpals with duplication of the little fingers representing a form of post-axial polydactylism. Under the Duran classification system it would be termed a type IV-B, in view of the bifidity of the metacarpal of the little finger.
No evidence of an erosive arthropathy.
Case Discussion
Polydactyly of the hand is the presence of a supernumerary digit. It is commonly subdivided into three main types, dependent on the location of the extra digit in the hand, from commonest to rarest: post-axial (ulnar/little finger), pre-axial (radial/thumb), and central polydactyly.
This is a case of post-axial polydactylism in view of the additional little finger, i.e. it is on the ulnar side.
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