Complications following retropubic versus transobturator midurethral synthetic sling placement

Transobturator slings (TOS) are inferior to retropubic slings (RPS) based on long-term outcomes; data on complications is critical for patient counseling. We hypothesized rates of urinary retention would be higher for RPS, while pain and repeat sling surgery would be higher for TOS.

Using the Premier healthcare database we identified encounters for patients undergoing a midurethral sling procedure between 2010 and 2020. Patients were stratified by sling type, either RPS or TOS. The primary outcome was the difference in the composite complication rate between groups within 12 months. Statistical analysis was performed using Kruskal Wallis test for continuous variables and χ²-test for categorical variables. Multivariable logistic regression was used to determine risk factors for complications and risk of specific complications after sling placement.

36,991 patients were included in the RPS group and 16,371 in the TOS group. 7,880 patients (14.8%) had at least one sling specific complication. On multivariable logistic regression, RPS patients were more likely to have urinary retention (OR 1.29, 95%CI 1.16-1.43), sling lysis/excision (OR 1.29, 95%CI 1.10-1.53), and hematoma/hemorrhage (OR 1.82, 95%CI 1.16-2.86); they were less likely to have a UTI (OR 0.88, 95%CI 0.82-0.96) or repeat sling (OR 0.60, 95%CI 0.46-0.78). In patients with urinary retention, RPS patients were more likely to undergo sling lysis than TOS (p = 0.012).

Significant complications after midurethral synthetic sling are overall rare. RPS are associated with a higher rate of perioperative bleeding and sling lysis/excision due to urinary retention, but less likely to be associated with UTI and treatment failure.