Trigger Twins: 2 Cases of Ipsilateral Twin Trigger Digit and a Review of Published Literature

BACKGROUND: The aetiology of trigger digits has been debated since Notta first described them in 1850. Aetiology has been segregated for adult and paediatric presentations. While an adult trigger digit is most likely an acquired inflammatory process, the same is not true for cases in children: no inflammatory reaction is seen on microscopic evaluation. We wish to add strength to a genotypical aetiology for paediatric cases. METHODS: We present two cases of monozygotic twins with trigger digits managed in our institution. A comprehensive review of literature was conducted for cases of trigger digit in monozygotic twins to support our theory. RESULTS: Our two sets of twins enjoyed a full recovery from surgery at one-month follow-up. A total of seven other cases of monozygotic twins were found in literature. CONCLUSION: Our cases add to the growing body of evidence supporting a genotypical aetiology for paediatric trigger digit.