Islam S, Oka I, Fujita S
Department of Plastic and Reconstructive Surgery, Tohoku University School of Medicine, Sendai.
Tohoku J Exp Med. 1992 Nov;168(3):459-66. doi: 10.1620/tjem.168.459.
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.
轴前多指畸形是一种常见的先天性手部异常。在138例患者的158个重复拇指中，通过对X线片和手术记录的分析，对这种异常进行了新的分类。最初，根据分叉的放射学范围，将所有重复拇指分为I型至VII型。附属指类型被视为一个单独的实体。发现IV型最为常见，涉及53个拇指（33.6%）。但手术结果表明，每种类型的分叉确切水平各不相同，VII型在手术时比之前X线检查发现的频率增加了两倍。根据手术中检测到的结构变化，将在IP关节（II型）、MP关节（IV型）和CM关节（VI型）放射学上遇到的重复拇指具体分为A至E五组。并对每组的细节进行了讨论。
