Safety and Efficacy of Single Incision Sling Versus Midurethral Sling in the Treatment of Stress Urinary Incontinence: A Randomized Controlled Trial

Importance This study compares the long-term efficacy and safety of an innovative single-incision sling (SIS) with the inside-out transobturator tape (TOT) sling in the treatment of female stress urinary incontinence.Objectives Women with urodynamic stress urinary incontinence were randomized to either SIS or TOT groups and followed up for 4 years. The primary outcome was objective cure defined with a negative cough stress test result. Secondary outcomes involved subjective cure reported via patient's satisfaction scale, surgery complications, postoperative de novo urgency, and patient's life quality.Study Design This is a randomized noninferiority controlled trial.Results A total of 168 women were randomized (84 in both groups). After 4-year follow-up, 130 patients were analyzed (66 in the SIS group and 64 in the TOT group). The objective (86.4% vs 84.4%; risk difference [95% confidence interval], 0.020 [-0.101 to 0.141]; P = 0.807) and subjective cure rates (83.3% vs 81.3%; risk difference [95% confidence interval], 0.020 [-0.111 to 0.151]; P = 0.821) were similar with the SIS and TOT groups. Both procedures were associated with low complication rates. Repeated surgery rates were 7.6% in the SIS group and 6.3% in the TOT groups. The mesh exposure rate was 1.5% for the SIS group and 3.1% for the TOT group. Incidence of de novo urgency did not vary between TOT and SIS patients. Both groups registered significant life quality improvement.Conclusion After long-term follow-up, anti-incontinence SIS surgery proved noninferior to the inside-out TOT procedure in terms of objective and subjective cure rates.