A child with triplication of the thumb is presented. Each thumb was fully developed with neurovascular bundles, flexor and extensor tendons. Although all three thumbs were triphalangeal, they shared a common metacarpal and two shared a common proximal phalanx. Since this anomaly does not fit in the existing accepted Wassel (1969) classification, a new category is suggested.
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Center of Congenital Hand Deformity and Rare Disease, Department of Hand Surgery, Beijing Jishuitan Hospital, China.
We proposed a modification of the Rotterdam classification for thumb triplication and tetraplication. Twenty-one patients were included (24 cases of thumb triplication and four cases of tetraplication). These were analysed and classified according to a modification of the Rotterdam classification involving three steps; from the radial to ulnar side, we first identified each thumb on radiographs and gross appearance to divide into triplication or tetraplication.
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