classification
Last reviewed 01/2018
Congenital syndactyly may be classified according to the:
- isolated anomaly or syndromic association
- tissues fused:
- simple - soft tissue alone from the proximal end of the digit
- complex - bone synostosis (metacarpal or phalangeal) and soft tissue
- acrosyndactyly - complex syndactyly characterised by fusion of the bones distally but not proximally; fenestrations are usually present between the bones proximally and associated with constriction ring syndrome
- extent of fusion proximal-to-distal:
- complete - fusion from web space to distal interphalangeal joints; can be associated with synonychia which is a shared or common fingernail
- incomplete
- number of digits affected eg single versus multiple
- unilateral or bilateral
- site affected:
- hand
- foot
- both