AUTHOR=Wu JianPing , Shi WeiZhe , Zhao Hai , Li JingChun , Li YiQiang , Hong Kai , Yuan Zhe , Zhu MingWei , Liu YuanZhong , Canavese Federico , Xu HongWen TITLE=Radiographic features of congenital thumb duplication type C2 of Wu et al. classification: new subtypes and surgical strategies JOURNAL=Frontiers in Pediatrics VOLUME=11 YEAR=2024 URL=https://www.frontiersin.org/journals/pediatrics/articles/10.3389/fped.2023.1286662 DOI=10.3389/fped.2023.1286662 ISSN=2296-2360 ABSTRACT=Objective

This study aimed (i) to evaluate the radiographic characteristics of patients with congenital thumb duplication (CTD) type C2 according to the classification of Wu et al., (ii) to describe the various subtypes of type C2 CTD, and (iii) to propose a classification system that allows the identification of different surgical strategies based on the radiographic anatomy of this specific subtype of duplication.

Methods

We retrospectively reviewed 92 patients (92 thumbs) with type C2 CTD according to the Wu et al. classification in our institution between August 2015 and April 2021. All CTDs were classified according to the interphalangeal joint alignment of the main thumb at the posteroanterior radiograph of the thumb before operation: type I (no deviation), type II (ulnar deviation), and type III (radial deviation).

Results

All CTDs (n = 92) could be classified according to the proposed classification system: 76 (82.6%) were type I, 10 (10.9%) were type II, and six were type III (6.5%). According to the Kim system of subtype classification, there were 55 (59.8%) type 1, 24 (26.1%) type 2, and 13 (14.1%) type 3 cases.

Conclusions

The suggested classification completes the Wu et al. system and has the potential to guide surgical treatment in children with type C2 CTD.

Level of evidence

III.