Syndactyly refers to a congenital fusion of two or more digits. It may be confined to soft tissue (soft tissue syndactyly / simple syndactyly) or may involve bone (bony syndactyly / complex syndactyly).

The overall estimated incidence is at ~1 per 2500 to 5000 live births 6,8. There may be a greater male predilection.

There is a very wide spectrum of syndactyly ranging from partial to complete.

Syndactyly can occur as an isolated phenomenon or can be associated with numerous other entities. Isolated cases can be either either sporadic or familial.

  • triploidy: tend to affect the 3rd and 4th digits of the hands

As a whole the 2nd and 3rd digits tend to be most frequently associated 6. May involve the toes more than fingers.

Postnatally the type and degree of bony syndactyly can be easily diagnosed on plain film.

Often difficult to diagnose on ultrasound (especially with soft tissue syndactyly). The diagnosis may be suggest if the digits appear to contantly move together 7. The fingers may appear constantly deformed with complex syndactyly 6.

The overall prognosis can be extremely variable dependent on the presence of other associated anomalies.

The term syndactyly is derived from the Greek words syn meaning together and daktulos meaning fingers.

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Article information

rID: 13659
Section: Gamuts
Tag: cases
Synonyms or Alternate Spellings:

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Cases and figures

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    Figure 1: clinical photograph
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    Right hand
    Case 1
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    Syndactyly with t...
    Case 2: with Apert syndrome
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    Case 3: with Apert syndrome
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    Case 4: with Fraser syndrome
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    Case 4: syndactyly
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