Comparing two types of slings for treating urinary incontinence during pelvic surgery

SASS: Randomized Trial of Single-incision Versus Retropubic Mid-Urethral Sling (Solyx) for Concomitant Management of Stress Urinary Incontinence During Minimally Invasive Sacrocolpopexy

Not applicable Interventional Wake Forest University Health Sciences · NCT04586166

This study is testing whether a new type of sling used during pelvic surgery works just as well as a traditional sling for treating urinary incontinence in women with pelvic organ prolapse.

Quick facts

PhaseNot applicable
Study typeInterventional
Enrollment180 (estimated)
Ages21 Years and up
SexFemale
SponsorWake Forest University Health Sciences Academic / other
Drugs / interventionsradiation
Locations7 sites (Coconut Creek, Florida and 6 other locations)
Trial IDNCT04586166 on ClinicalTrials.gov

What this trial studies

This trial, known as SASS, is a multicenter, prospective, randomized, single-blind non-inferiority trial that aims to evaluate the effectiveness of a single-incision sling versus a retropubic mid-urethral sling during minimally invasive sacrocolpopexy in women with pelvic organ prolapse and stress urinary incontinence. Participants will be women aged 21 and older who exhibit specific symptoms and conditions related to pelvic floor disorders. The study will involve surgical interventions and follow-up assessments to determine the outcomes of each sling type.

Who should consider this trial

Good fit: Ideal candidates for this study are women aged 21 and older with pelvic organ prolapse and objectively confirmed stress urinary incontinence.

Not a fit: Patients who have previously undergone surgery for stress urinary incontinence or have serious chronic conditions that could interfere with study compliance may not benefit from this study.

Why it matters

Potential benefit: If successful, this study could provide insights into the most effective surgical approach for treating stress urinary incontinence in women, potentially improving patient outcomes.

How similar studies have performed: Other studies have explored similar surgical approaches, but this specific comparison of single-incision versus retropubic slings during sacrocolpopexy is relatively novel.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

* At least 21 years of age
* Vaginal bulge symptoms as indicated by an affirmative response of \>1 to question 3 of the PFDI-SF20
* POP ≥ stage II according to the pelvic organ prolapse quantification (POP-Q) system45, with evidence of apical descent
* Women being considered for minimally invasive sacrocolpopexy (with or without concomitant hysterectomy)
* Objective SUI: positive standardized cough stress test on clinical examination or on urodynamic study with reduced prolapse
* Understanding and acceptance of the need to return for all scheduled follow-up visits and willing to complete study questionnaires
* Able to give informed consent

Exclusion Criteria:

* Prior surgery for stress urinary incontinence including mid-urethral sling; Burch/MMK; fascial pubovaginal sling (autologous, xenograft or allograft); and urethral bulking injection
* Any serious disease, or chronic condition, that could interfere with the study compliance
* Unwilling to have a synthetic sling
* Untreated and unresolved urinary tract infection
* Poorly-controlled diabetes mellitus (HgbA1c \> 9 within 3 months of surgery date)
* Neurogenic bladder/ pre-operative self-catheterization
* Elevated post-void residual/PVR (\>150 ml) that does not resolve with prolapse reduction testing (pessary, prolapse reduced uroflow or micturition study)
* Prior pelvic radiation
* Inflammatory bowel disease
* Current genitourinary fistula or urethral diverticulum
* Planned concomitant bowel related surgery including sphincteroplasty and perineal rectal prolapse surgery, rectovaginal fistula repair, hemorrhoidectomy
* Pregnant or Planning to Conceive
* Incarcerated

Where this trial is running

Coconut Creek, Florida and 6 other locations

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.
Conditions Stress Urinary IncontinencePelvic Floor DisordersRetropubic SlingSingle-Incision SlingSacrocolpopexy
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.