Use of the duplication range concept for understanding morphology and predicting prognosis in thumb polydactyly

Susumu Saito, Aiko Makino, Hiroki Yamanaka, Itaru Tsuge & Naoki Morimoto
This study systematically and comprehensively analysed 129 thumb polydactylies in 122 patients using a duplicating range concept based on the level of skin and skeletal bifurcation. Numerical levels were defined along the longitudinal axis of the ulnar thumb duplicate from distal to proximal: level 0 (thumb tip) to level 6 (carpometacarpal joint). The relationships between duplication range and morphological parameters were evaluated. Nail asymmetry was associated with skin bifurcation levels 0 to 2. Proximal phalangeal...
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