[Functional evaluation of a "two in one" urethroplasty for hypospadias]

To assess the functional result of a "Two in One" urethroplasty which combined oral mucosa graft and local flap.

17 patients with hypospadias underwent a "Two in One" urethroplasty, which combined buccal mucosa and local flap for urethral reconstruction. Uroflowmetry was performed 1 day before and 1 year after operation. The urine flow rate, voided volume and urine flow curves were detected using a rotating sensor. The results of maximum urine flow rate (Qmax) were expressed as percentiles and compared to the Toguri value from normal children.

Before corrective operation, 12 of 17 patients (70.6%) produced a plateau urine flow curve. 5 patients (29.4%) produced a very low flow curve. The average maximum flow rate was (7.89 +/- 2.29) ml/s per second compared to Toguri values, 12 of 17 patients (70.6%) had a Qmax below the normal 5th percentile. After a "Two in One" urethroplasty, a hell-shaped curve was obtained in 10 patients (58.8%). The maximum flow rate was (11.30 +/- 3.01) mL/s per second. 7 of 17 patients (41.2%) had a Qmax above the normal 25th percentile, 8 patients (47.1%) had a Qmax between the normal 25th percentile and 5th percentile, only 2 patients (11.8%) had a Qmax below the 5th percentile.

The functional result of the "Two in One" urethroplasty is ideal. The maximum urine flow rate of the patients increases after the operation.