Hayashi M, Takagi T, Masada Y
Department of Plastic Surgery, Sumitomo Hospital, Osaka, Japan.
Ann Plast Surg. 1997 Jul;39(1):97-9. doi: 10.1097/00000637-199707000-00018.
Lateral ray polydactyly of the foot is morphologically classified on the basis of the external appearance and the anatomic patterns of bony structures. Classification is difficult when the level of duplication is not apparent. We encountered a case of a duplicated metatarsal with no duplication of phalanges. The anomaly was considered to be a case of polydactyly because there were supernumerous metatarsals. On the basis of embryological failure, limb malformations are classified into several categories, and polydactyly belongs to that of duplication. There are, however, some malformations that are difficult to classify clearly. We considered our case to be a result of duplication followed by fusion of the digits.
足部外侧射线多指畸形是根据其外观和骨结构的解剖模式进行形态学分类的。当重复的水平不明显时，分类就很困难。我们遇到了一例跖骨重复而趾骨未重复的病例。由于存在多余的跖骨，该异常被认为是多指畸形的一种情况。基于胚胎发育失败，肢体畸形可分为几类，多指畸形属于重复类。然而，有些畸形很难明确分类。我们认为我们的病例是指骨重复后融合的结果。
