Patients and methods: from January 2000 to December 2002, at Children Hospital No. 1, there were 135 patients who underwent surgical treatment for hypospadias using Duckett 's technique, ages from 9 months to 15 years old (mean age 6, 3), including middle hypospadias in 62 (46%) and posterior hypospadias in 73 (54%); onlay flaps in 80 (59, 2%) and tube flaps in 55 (40, 8%).