Acrosyndactyly

A more complex type of syndactyly is termed acrosyndactyly.

This is a form of constriction band syndrome (sequence) in which the fingers were once completely separated but then a band formed around the fingers during embryonic development resulting in a re-fusion of adjacent digits. This is still a poorly understood phenomenon. Multiple fingers may sometimes be involved. A telltale appearance of this problem is an every present sinus (fenestration) at the base of the web fingers. Principles of separation of these acrosyndactylous fingers are the same as for other types of syndactyly. Sometimes these fingers may be foreshortened because the band that formed around the digits may have been so constricting as to reduce the blood supply to the growing fingers.