A TriNetX Analysis of Hypertrophic Scarring Disorders, Genitourinary Strictures, and Urethroplasty Failure

Background: Urethral strictures and bladder neck contractures (BNCs) can be significantly morbid for patients and may require intervention for effective urinary drainage. We hypothesized patients with abnormal scarring disorders, such as keloids or hypertrophic scars, are at elevated risks of urethroplasty failure as well as postprocedural urethral strictures and BNCs. Methods: We queried the TriNetX database to determine the risk of urethroplasty failure for patients with abnormal scarring disorders compared to controls. We also investigated the risk of developing urethral strictures and BNCs for patients undergoing various endourology procedures. Results are reported in terms of risk ratio (RR) with 95% confidence interval (CI). Statistical significance was considered when the CI did not include 1.0. Propensity score matching was performed to limit confounding. Notably, TriNetX rounds values < 10 to 10 for patient anonymity (denoted by *). Results: Urethroplasty patients with scarring pathology needed a second procedure more than twice as often (36.2% vs. <17.2%*, RR = 2.1, 95%CI 1.1-4.1). Following cystoscopy, there was no difference in urethral stricture rates for patients with scarring disorders (2.7% vs. 2.6%, RR = 1.1, 95%CI 0.85-1.3). These patients also showed similar rates of BNCs (7.5% vs. 5.3%, RR = 1.4, 95%CI 0.84-2.3) and urethral strictures (5.9% vs. 5.3%, RR = 1.1, 95%CI 0.68-1.8) after transurethral bladder outlet procedures. Conclusions: Patients with scarring disorders showed much higher urethroplasty failure rates. They experienced similar rates of urethral strictures and BNC formation after endoscopic procedures. These novel findings underscore the importance of recognizing abnormal scarring conditions during preoperative assessments, guiding clinicians in counseling patients and tailoring operative interventions.