Metacarpals 4 and 5 fusion

Definition[edit | edit source]

Syndactyly type 8 is a rare, genetic, non-syndromic, congenital limb malformation characterized by unilateral or bilateral fusion of the fourth and fifth metacarpals with no other associated abnomalities.

Presentation[edit | edit source]

Patients usually present with shortened fourth and fifth metacarpals with excessive separation between their distal ends, resulting in marked ulnar deviation of the little finger and an inability to bring the fifth finger in parallel with the other fingers.

NIH genetic and rare disease info[edit source]

NIH info on Metacarpals 4 and 5 fusion

Metacarpals 4 and 5 fusion is a rare disease.

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Rare diseases - Metacarpals 4 and 5 fusion
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Also see	Comprehensive list of genetic and rare diseases
Resources	NIH GARD, US Genetic and Rare Diseases Info Rare Disease Day Undiagnosed Diseases Network Database of rare diseases at Orphanet Rare Disease UK Rare diseases search engine