Undermining the epidermis around the U-shaped skin incision preserves thick, well-vascularized tissue that...

We modified the U-shaped skin incision technique (UIT) during urethroplasty (UP) to prevent post-UP complications (post-UPC).

Our modified UIT (mUIT) involves undermining the epidermis for 5-7 mm around the U-shaped incision to create a thicker, better vascularized tissue layer for suturing the neourethra compared with UIT. To prevent injury to underlying connective tissue and avoid compromising blood perfusion, the scalpel should be held at a more slanted angle than is conventional. After the urethral plate is incised in the midline, stay sutures are placed to the middle of the penile shaft as a landmark, and three to five sutures are placed through the thick layer created by undermining. To facilitate mobilizing connective tissue during neourethroplasty, relaxing incisions may be used on the edges of the connective tissue. We compared 207 hypospadias patients who had primary or staged UP using either mUIT (n = 110) or UIT (n = 97) between 2003 and 2017 for incidence of post-UPC.

mUIT had significantly less post-UPC than UIT after a mean follow-up of 6.44 ± 0.26 years after final UP, 1/110 (0.9%) versus 15/97 (15.5%) (p < .0001).

Undermining the edges of the U-shaped incision during mUIT would appear to prevent post-UPC.

Level III.