A modified onlay island flap vs. Mathieu urethroplasty for distal hypospadias repair: A prospective randomised study

To compare the outcome of a modified onlay island flap (MOIF) with that of the Mathieu urethroplasty for distal hypospadias repair.

In a prospective randomised study, 60 patients with coronal, subcoronal and distal penile hypospadias, with a urethral plate width of ⩽6 mm, and minimal or no chordee, underwent either MOIF using a midline longitudinal outer preputial skin flap passed ventrally by penile buttonholing through dartos fascia incision, or a Mathieu urethroplasty. Closed envelopes were used for randomly selecting patients for each procedure. The operative duration, complications, cosmetic outcome, urinary stream and relatives' satisfaction were reported for each procedure.

Preoperative data (patients' age and site of urethral meatus) and operative duration were insignificantly different between the groups (P = 0.653, 0.786 and 0.710, respectively). There were no intraoperative complications in either group. The duration of follow-up was insignificantly different between the groups. Patients treated with the MOIF had a statistically significant lower complication rate (P = 0.036), and a better cosmetic outcome, urinary stream and relatives' satisfaction (P < 0.001 for all).

The MOIF urethroplasty seemed to be better than the Mathieu urethroplasty in patients with distal hypospadias and narrow urethral plates. Further studies including more patients, and a longer follow-up with an objective evaluation of functional outcome should be encouraged to confirm these early results.