A modification of the surgical correction of the thumb--a long term follow up.

A modification of the commonest surgical procedure to restore Abduction-Rotation using the flexor superficialis transfer with Y-insertion is described. The modification consists of doing a triple insertion at the thumb instead of Y-insertion. After introducing the triple insertion the procedure shows 80-90% or more good results, whereas 50% or more failures are reported in the existing literature, when a Y-insertion only is used which cannot safely prevent 'Z' deformity. 60 cases were followed up.