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Anatomical study of preaxial polydactyly in 158 hands.

Authors
  • Islam, S
  • Oka, I
  • Fujita, S
Type
Published Article
Journal
The Tohoku journal of experimental medicine
Publication Date
Nov 01, 1992
Volume
168
Issue
3
Pages
459–466
Identifiers
PMID: 1304652
Source
Medline
License
Unknown

Abstract

Preaxial polydactyly is a common congenital hand anomaly. Here in 138 patients with 158 duplicated thumbs, a new classification of this anomaly was done from analysis of radiographs and operation records. Initially all the duplicated thumbs were arranged into from Type I to VII on the basis of radiological extent of bifurcation. Appendage type was noted as a separate entity. Type IV was found the most common and had 53 thumbs (33.6%) involved. But findings on surgery indicated that the exact level of bifurcation varied in each type, and Type VII became three times as frequent as previously noted from x-ray examination at the time of surgery. Radiologically encountered duplications at IP (Type II), MP (Type IV) and CM (Type VI) joints were specifically classified into five groups from A to E on the basis of the structural changes detected on surgery. Details in each group were discussed.

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