Two or more fingers may be joined together since birth. This is called SYNDACTYLY.
The surgery is done very early in the childhood. Waiting till later in life cause further deterioration in the deformity.
The web space is reconstructed so that it looks more like the alphabet U and not like the alphabet V. The skin fold around the nail bed is reconstructed as well for better cosmetic appearance.
The important rehabilitation after the surgery is aimed at restoring full movements and preventing contractures.