Transurethral polydimethylsiloxane implantation: A valid option for the treatment of stress urinary incontinence due to intrinsic sphincter deficiency without urethral hypermobility

Purpose: In this study we evaluated the 5-year followup results of periurethral polydimethylsiloxane (PDMS) injection for female stress urinary incontinence (SUI) secondary to intrinsic sphincter deficiency (ISD) without hypermobility of the vesicourethral junction. Materials and Methods: A total of 61 female patients with ISD were enrolled in this prospective, observational study. Preoperative and postoperative assessment included a standardized urogynecologic history with questions regarding urinary function, urogynecologic and neurological physical examination, and urodynamic assessment. All patients underwent periurethral PDMS injection. Patient followup was performed 1, 6, 12, 24, 36, 48 and 60 months after surgery. Results: At 60 months after injection the SUI cure rate was 18%, the improvement rate was 39% and the failure rate was 43%. The success rate was 57%. Of the patients 45 (74%) subjectively improved with respect to the severity of urinary incontinence. No postoperative early complications were found. At 60 months of followup only minor complications were reported (11%). Conclusions: Careful patient selection by optimal diagnostic tools are essential for maximizing the results of urethral bulking agent therapy. PDMS injection in women with SUI due to ISD with limited urethral mobility is a valid, minimally invasive procedure.