The aim of this study is to report results and complications occurred after surgery for congenital bifid thumb. From June 2015 to June 2020 a case series of 47 thumb duplications, Wessel type II, III and IV, was treated. All patients received removal and reconstruction of the thumb. They were evaluated using Tada score and plain X-ray with a mean follow-up of 6 years. Average Tada score was 3.8. Nine patients developed minor complications. A second surgery was necessary in 7 patients: 2 scar revisions, 3 corrective osteotomies, and 3 extensor pollicis longus tendon (EPL) retensionings. The percentage of reoperated patients is comparable with the data reported in the literature. Complications are minor and affect soft tissues. This is due to the difficult management of soft tissues and their possible evolution. EPL lag is difficult to treat and in our experience it has a tendency to recurrence after retensioning. Level of evidence: II.
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