PubMed · 13785088
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W J WIELINGA. 1961-06-17. [Double thumb with biphalangia].. https://pubmed.ncbi.nlm.nih.gov/13785088/
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Metacarpal synostosis is a rare congenital hand malformation requiring only occasionally a surgical correction. However in case of divergent epiphyses there is a progressive accentuation of the deformity. In the "Y" type of symmetrical synostosis, the authors propose a trapezoidal osteotomy with upside down relocation allowing realignement of the epiphyses without distant bone donor site.
Mirror hand is one of the rarest congenital differences of the upper extremity. Typically, there is absence of the radius, duplication of the ulna, and 7 digits in mirrored symmetry about the middle finger. We report a case of a rarer subset of hand duplication in which there is a normal radius and ulna and a hand with 8 digits. The patient underwent surgery to excise the radial 3 digits and to reconstruct the remaining radial digit to function as an opposable, 2 phalanx thumb. Wrist extension was augmented by transferring the digital extensors from the excised fingers to the radial wrist extensors.