A Classification System of Radial Polydactyly: Inclusion of Triphalangeal Thumb and Triplication

Classification and Developmental Biology of Congenital Anomalies of the Hand and Upper Extremity

“…He modified the Wassel type-IV classifi- Patient with severe camptodactyly of the little finger and less notable camptodactyly of the long and ring fingers. Zuidam et al 119 recently attempted to address some of these concerns with a more extended classification. This classification includes the carpal bones; type VII represents partial bifurcation at the level of the trapezium, and type VIII represents complete bifurcation at the scaphotrapezial joint.…”

Congenital Hand Differences

“…1 I would like to comment on the recent classification of thumb polydactyly by Zuidam et al 2 Zuidam et al 2 have elaborated on the Wassel's classification, which is based on the x-ray appearance of the bony skeletons of the thumb polydactyly. 3 The classifications of Wassel 3 and Zuidam et al 2 diagram the ossification centers in the epiphysis.…”

Congenital Hand Differences

“…The Wassel classification, 1 which uses the level of skeletal duplication to categorize the deformity, has been universally accepted, as it is an easy-to-apply system and has stood the test of time. Zuidam et al 2 noted that a major deficiency of the Wassel classification system was that the more complex deformities (such as the proximal extra digits, triphalangeal polydactyly, and triplicate thumbs) are not well described; their recent modification should assist in understanding and treating these especially complex presentations (Fig. 1).…”