Syndactyly is the condition in which two or more fingers are joined or fused together.
Types of Syndactyly
1. Simple Syndactyly: condition in which extremities are fused by soft tissues.
2. Complex Syndactyly: condition in which bones of fingers are joined.
3. Complete or Incomplete: skin is joined all through and through, however in incomplete finger tips are free
4. Fenestrated Syndactyly: when there is a gap between skin is know as fenestrated syndactyly
In this patient you see complex syndactyly as two bones are fused see the x ray below
see the hand of four year old SADIA being operated on 24feb2010, generally syndactyly is treated by plastic surgery, bones are cut skin fusion removed either graft is applied from groin or anterior elbow or simply graftless sundactyly correction is done by mobilising the skin.
and another picture of hand from dorsum side see below
See the surgical correction of syndactyly in the video below
Hairs can grow on graft area
Finger can deviate
Graft darken and become noticable
Complex syndactyly occurs as a part of Apert Syndrome.
Must also read from emedicine about syndactyly and apert syndrome with nice pics.