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The condition characterized by union of two or more digits, as in certain birds and mammals; it is a familial anomaly in humans.



in humans, a congenital deformation of the hand or foot characterized by the adhesion of two or more digits; a type of developmental anomaly.

Different types of syndactyly are distinguished, depending on the extent of adhesion. With complete syndactyly the connection extends along the entire length of the digits, and with partial syndactyly the connection is limited to the base of the involved digits. Membranous syndactyly is most commonly partial and is manifested by the appearance of a thin, cutaneous membrane at the base of the digits. With simple syndactyly the digits are connected along their entire length by a thick, cutaneous intersection, and with complicated syndactyly the digital bones are fused. The most serious form is terminal syndactyly, which is characterized by the adhesion of only the tips of the digits. This condition is accompanied by the severe deformation of the digits and the loss of their function.

Syndactyly is treated surgically.

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References in periodicals archive ?
Syndactyly is thought to occur about once in every 2000 to 2500 births and is twice as common in males.
Clinical classification of syndactyly is of value only insofar as it aids in treatment.
Syndactyly is defined as simple when the webs contain only normal soft tissues and as complex when adjacent phalanges are fused or when there is interposition of accessory phalanges.
Webbed fingers is an obvious physical defect, and individuals can and do, even in these times, go through life without having a separation of a syndactyly.
Similar uncorrectable deformities arise in triple syndactyly (Figure 6).
The combination of ring-small finger and thumb-index finger webbing is rare in pure syndactyly but is the rule in acrocephalosyndactyly, and it is my practice to do both dewebbings in such patients at the same time.
There is no great urgency to separate a syndactyly between the long and ring fingers even if the condition is complex.
In a review of syndactyly repair carried out at the University of Iowa Hospitals between 1946 and 1960, we showed that in those years more postoperative complications and less satisfactory results were obtained in children who were operated on when younger than 18 months.
Syndactyly is common but its treatment is not easy; it requires good technical ability and judgment.
I prefer using full-thickness skin grafts for all primary syndactyly repairs, and I take the grafts from the lateral inguinal area.
Raus, MD, read a paper in which he described a 4-year follow-up of two patients with syndactyly separation.
I have described only the principles I followed in the treatment of simple syndactyly and have deliberately left out a wealth of technical details.