Efficacies of treating atypical Wassel type Ⅵ thumb duplication with on-top-plasty plus axial flap
Objective To explore the clinical efficacies of on-top-plasty plus axial flap for childrens with atypical Wassel type Ⅵ thumb duplication(polydactyly).Methods From August 2016 to August 2020,6 children of atypical Wassel type Ⅵ thumb duplication were reviewed retrospectively.There were 5 boys and 1 girl with an average age of 25(18-35)months.The involved side was left(n=3)and right(n=3).Reconstruction of thumb was performed with on-top-plasty plus axial flap.According to the JSSH scoring system,length of reconstructed metacarpal bone was compared with contralateral thumb.And girths of reconstructed thumb were measured at the levels of metacarpophalangeal and interphalangeal joints and compared to contralateral counterparts at the last follow-up.Results During an average follow-up period of 37(30-45)months,all axial flaps survived without necrosis.Motions at metacarpophalangeal and interphalangeal joints showed no restriction and both gripping and pinching were excellent.According to the JSSH scoring system,the outcomes were excellent(n=3)and decent(n=3).The average length of reconstructed thumb relative to contralateral thumb was 87%.As a percentage of contralateral thumb,average girth of reconstructed thumb was 102%at metacarpophalangeal joint and 100%at interphalangeal joint.Conclusions For atypical Wassel type Ⅵ thumb duplication in children,on-top-plasty plus axial flap are efficacious.