Modified Koyanagi technique for one-stage repair of severe hypospadias: short-term efficacies

Objective To explore the short-term efficacies of modified Koyanagi technique for one-stage repair of severe hypospadias. Methods Retrospective reviews were conducted for the clinical data of 40 patients undergoing modified Koyanagi procedure for severe hypospadias from February 2012 to July 2014.Their mean age was 3.9(1.5-14) years at the time of surgery. The types were scrotal (n=17), perineal (n=17) and penoscrotal (n=6). Results The mean length of neourethra was 4.5(3-7) cm and the mean follow-up period 7 (3-28) 28 months. And the complications included urethrocutaneous fistulas (n=8, 20%) and dehiscence of neourethra (n=1, 2.5%). There was no onset of stricture or urethrocele. All patients achieved satisfactory cosmetic and urethral functional outcomes. Conclusions The modified Koyanagi technique may preserve the blood supply of flap and residual prepuce effectively and simplify the operation obviously. Also the use of tunica vaginalis flap or dartos flap reduces significantly the rate of complications. Key words: Hypospadias; Urologic surgical procedures, male; Treatment outcome