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Radiographic gapometry score: A simple predictor for surgical approach in pediatric traumatic posterior urethral
Virender Sekhon1, Sharmad J Kudchadkar2, Anubhav Raj2
1Pediatric Urology, Department of Urology and Renal Transplantation, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India.
Insights
A new gapometry index (G/U index) helps predict surgical needs for pediatric posterior urethral injuries. This score guides pediatric urologists in selecting the best surgical approach for traumatic urethral strictures in children.
Area of Science:
- Pediatric Urology
- Trauma Surgery
- Urethral Reconstruction
Background:
- Post-traumatic posterior urethral injuries in children are rare and challenging to manage.
- Current management relies on adult data, with limited information on age-related surgical feasibility.
- End-to-end urethroplasty presents unique challenges in pediatric patients.
Purpose of the Study:
- To validate a simple preoperative radiographic score for predicting surgical repair type in pediatric traumatic posterior urethral strictures.
- To correlate radiographic findings with the anatomical approach needed for urethroplasty.
- To aid in the precise management of these rare injuries.
Main Methods:
- Retrospective study of 38 pediatric patients (<15 years) with traumatic bulboprostatic strictures.
- Calculation of the gapometry index (G/U index) from preoperative voiding cystourethrogram (VCUG) and retrograde urethrogram (RGU).
- Analysis of G/U index in relation to surgical approach: simple perineal vs. elaborate transpubic.
Main Results:
- A significant difference in mean urethral gap length was observed between the two surgical groups (2.1 cm vs. 3.6 cm).
- The G/U index directly correlated with the complexity of the surgical procedure required.
- Overall urethroplasty success rates ranged from 92.3% to 94.6%.
Conclusions:
- Urethral extensibility favors younger children, challenging the traditional view of transpubic approach benefits.
- The G/U index is a novel predictor for surgical approach in posterior urethral defects.
- A preoperative G/U index can guide operative strategy, improving patient management.
Background:
Post-traumatic posterior urethral injuries in children are rare events. Their management algorithms are extrapolations from adult literature and they continue to pose a difficult challenge for pediatric urologists. Not much data for age-related feasibility of an end-to-end urethroplasty are available.
Objective:
This study was designed to validate a simple preoperative radiographic score to predict the type of surgical repair for traumatic posterior urethral strictures in children.
Materials And Methods:
This retrospective study was conducted in a tertiary care center in northern India between 2000 and 2015. All patients under 15 years with traumatic bulboprostatic stricture disease were included. Preoperative voiding cystourethrogam (VCUG) and retrograde urethrogram (RGU) films were used to calculate the gapometry index (G/U index), defined as the length of urethral gap divided by the bulbar urethral length. This index was then analyzed for two patient groups based on the anatomical approach employed for achieving an end-to-end urethroplasty: group 1, who underwent a simple perineal approach, and group 2, who needed a more elaborate procedure. Statistical analysis was performed with the two-tailed t-test with SPSS version 18.
Results:
A total of 38 patients met the inclusion criteria. The age distribution and G/U index for both groups are detailed in the table. The difference in mean length of the urethral gap for both groups was statistically significant (2.1 cm in group 1 vs. 3.6 cm in group 2). There was a direct correlation between the complexity of surgical procedure required to bridge the urethral gap and the G/U index. The overall success for urethroplasty in either group was between 92.3% and 94.6%.
Discussion:
Urethral extensibility is more suitable for younger children. This challenges the traditional viewpoint that the transpubic approach for urethroplasty is more favorable in children. No previous study has been cited in literature correlating the gapometry index with the surgical approach for posterior urethral defects. Our results reflect that a preoperative G/U index of 0.44 correlate with a simple perineal repair, whereas an index of above 0.87 indicates the likelihood of needing a more elaborate transpubic approach.
Conclusions:
Preoperative assessment of G/U index in children with traumatic posterior urethral injuries can successfully predict the operative approach and may therefore aid in better management of these patients.
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