Tunica vaginalis flap is superior to inner preputial dartos flap as a waterproofing layer for primary TIP repair in midshaft hypospadias

AimsThe aims of this study are 1. to compare outcome of standard tubularised incised plate urethroplasty (TIP) repair using dartos flap in distal vs. midshaft hypospadias and 2. to determine whether tunica vaginalis flap (TVF) is superior to dartos flap in midshaft hypospadias in reducing early complications.MethodsAll patients who underwent TIP repair between 2004 and 2011 by the same surgeon were divided into three groups based on type of hypospadias and choice of waterproofing layer: Group A: Distal hypospadias; inner prepucial dartos flap (n = 36); Group B: Midshaft hypospadias; inner prepucial dartos flap (n = 26); Group C: Midshaft hypospadias; TVF (n = 21). Early outcomes were compared between the groups using Fisher's exact test.ResultsThere was no significant difference in the age distribution or duration of follow up between the groups. There was no significant difference in terms of, glans dehiscence or meatal stenosis between the groups. In Group A, 0/36 had ventral skin necrosis and 3/36 (8.3%) developed urethrocutaneous fistula. In Group B, there was significantly higher ventral skin necrosis (6/26; 23%) and urethrocutaneous fistula (8/26; 30.7%) compared to Group A (p = 0.04). In Group C, there was significantly less ventral skin necrosis (0/21) and urethrocutaneous fistula (1/21; 4.7%) compared to group B (p = 0.03). There was no significant difference in outcomes between Group A and Group C.Conclusion1. TIP repair using inner prepucial dartos flap has significantly higher complications when used for midshaft hypospadias compared to distal hypospadias. 2. Tunica vaginalis flap reduces the fistula rate and is superior to inner prepucial dartos flap as a waterproofing layer for primary TIP repair in midshaft hypospadias.