Straightening ventral curvature while preserving the urethral plate in proximal hypospadias repair

Abstract

Purpose: We report the efficacy of an expanded algorithm for penile straightening in proximal hypospadias surgery to preserve the urethral plate for urethroplasty. We also compared ventral corporotomy with grafting to multiple superficial ventral corporotomies without grafting for straightening greater than 30-degree ventral curvature.

Materials and methods: The need for urethral plate transection was compared in 2 groups comprising consecutive patients with proximal shaft to perineal hypospadias repair done by one of us (WS). The 47 patients in group 1 underwent surgery from 2000 to 2005 and had ventral curvature greater than 30 degrees after degloving, leading to urethral plate transection, while in 23 in group 2 from 2006 to 2008 mobilization of the corpus spongiosum/urethral plate and proximal urethra were also performed before urethral plate transection. Patients in group 1 with greater than 30-degree ventral curvature after urethral plate transection underwent ventral corporotomy with grafting (7) or multiple transverse corporotomies without grafting (4), while those in group 2 with greater than 30-degree ventral curvature after corpus spongiosum/urethral plate and urethral mobilization underwent multiple transverse corporotomies without grafting.

Results: Excluding 10 group 1 and 3 group 2 boys without ventral curvature after degloving the rate of urethral plate transection significantly decreased from 54% to 15% using the expanded algorithm (p = 0.005). At a mean followup of 11 months in those with corpus spongiosum/urethral plate and urethral mobilization there was no recognized recurrent ventral curvature. Seven patients with greater than 30-degree ventral curvature underwent ventral corporotomy with grafting, while 11 underwent multiple transverse corporotomies without grafting. At a mean followup of 27 and 19 months, respectively, no patient had recurrent ventral curvature.

Conclusions: Mobilization of the corpus spongiosum/urethral plate and the urethra in proximal hypospadias cases with greater than 30-degree ventral curvature after penile degloving decreases the need for urethral plate transection. Ventral lengthening to correct corporeal disproportion can be achieved by corporotomy with grafting or by multiple transverse incisions without grafting.