32 cases of the polydactyly operated at the department of plastic surgery, National medical center and Wonju christian hospital, College of medicine, Yonsei university during the last 4 years were classified on the basis of embryological and anatomical aspects. We reviewedincidence, epidemiology, inheritance, combined anomalies and also optimum time and method of the operation of polydactyly.
We have obtained lollowing results.
1. Female was more frequent than male with the over all ratio of 3 : 2 (in preaxial polydactyly, F : M = 1 : 1, central and post-axial polydactyly, F : M = 2 : 1).
2. Pre-axial polydactylies were 14 cases (44%), post-azial polydactylies were 12 cases (37%), and central polydactylies were 6 cases (19%).
3. 14 cases (100%) of pre-axial polydactyly were on hands and 11 cases (92%) of post-axial polydactylywere on feet. Dentral polydactylies were equally on hands and feet.
4. Left:right:bilateral ratio of the pre-axial polydactyly was 5 : 9 : 1 and type IV by Wassel’s clasificaion was most frequent as 9 cases (64%), next type II, type I, type III came in order.
5. All 6 cass (100%) of the central polydactyly were type II by Stelling & Turek’s classification. Extra digits were located on ulnar side of 3rd finger on hands and lateral side of 4th toe on feet.
6. Left:right:bilateral ratio of the post-axial polydactyly was 3 : 6 : 2 and type II by Stelling & Turek’s classification was most frequent as 8 cases (67%).
7. All central polydactylies combined syndactyly, 4 cases (33%) of post-axial polydactylies combined dwarfism, anomalous spine, exotropia or constricted band and 2 cases of pre-axial polydactylies combined congenital heart disease or iron deficiency anemia.
8. Central polydactylies were inherited as autosomal dominant traits and other polydactylies were inherited sporadically.
9. The early surgical correction of polydactyly is recommendable especially in central polydactyly.
10. If the surgical correction is involving a joint, the joint should be reinforced with flexor, extensor tendons or periosteum of the extra digit.
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