Congenital condition in which two or more digits are fused together.

• M/C congenital malformation of the limbs

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Classification

Complexity

• Simple syndactyly
  • Adjacent fingers or toes are joined by soft tissue
• Complex syndactyly
  • Bones of adjacent digits are fused
  • The kangaroo exhibits complex syndactyly.

Extent

• Complete syndactyly
  • Skin is joined all the way to the tip of the involved digits
• Incomplete syndactyly
  • Skin is only joined part of the distance to the tip of the involved digits

Genetics

• type I: 2q34-q36
  • Webbing occurs between middle and ring fingers and/or second and third toes
• type II: 2q31
  • Involves long and ring fingers, but has a sixth finger merged in between
• type III: 6q21-q23
  • Small finger is merged into the ring finger
• type IV: 7q36
  • Involves all fingers and/or toes
• type V: 2q31-q32
  • Similar to type I, but the metacarpals and metatarsals may also be fused

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Management

Digit release surgery