The Duplicated Thumb: A Review.

Preaxial polydactyly is a common, often sporadic, congenital anomaly that must be addressed surgically early in life. Ideally, the surgeon seeks to accomplish three goals: construction of a thumb that is adequate in size, preservation of pinch function, and reconstruction of all components in one procedure. Although each case is unique, several classification systems attempt to describe the various types. In this article, the authors discuss the various classification systems, procedures, and outcomes after surgery for pediatric thumb duplication.