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Single-Incision Mini-Sling

Single-incision mini-slings (SIMS, SIS) are short polypropylene slings placed through one vaginal incision without suprapubic or groin exit incisions. The sling anchors laterally, usually into the obturator internus muscle or obturator membrane, to support the midurethra while avoiding full retropubic or transobturator trocar passage.[1][2][3]

This page focuses on SIMS. For shared midurethral sling counseling, see Female Slings & Suspensions.

Indications​

SIMS is most attractive when the patient values less dissection, no skin exit incisions, shorter operative time, and lower early postoperative pain, while accepting less mature long-term durability data than standard full-length MUS.[2][3][4]

ScenarioWhy SIMS fits
Uncomplicated index SUIContemporary trials support noninferiority to standard MUS through 3 years in selected patients[3][5]
Need to reduce early pain / recovery burdenNo retropubic or full obturator exit passage
Local or limited anesthesia strategySmaller dissection can support lower-intensity anesthesia pathways in selected patients
High concern for organ injuryLess trocar passage; meta-analysis shows lower organ injury signal than standard MUS[4]

Relative reasons to choose standard MUS instead include severe SUI, high concern for durability, complex recurrent SUI, prior failed sling, marked ISD, or need for the longest available follow-up evidence.

Mechanism​

SIMS uses the same midurethral support concept as RMUS and TMUS but with a shorter implant and device-specific lateral anchors. The operation depends on:

  • accurate midurethral placement,
  • symmetric lateral anchoring,
  • avoidance of urethral compression,
  • tissue ingrowth into macroporous polypropylene.

Because each SIMS device has a specific anchor and tensioning system, the surgeon should treat the device instructions as part of the operation rather than as packaging.

Technique​

  1. Make a single midurethral vaginal incision.
  2. Develop short bilateral paraurethral tunnels toward the obturator internus / obturator membrane.
  3. Deploy the sling anchors laterally according to the device-specific system.
  4. Confirm symmetric tape position under the midurethra.
  5. Adjust the sling so it supports without compressing the urethra.
  6. Close the vaginal incision.

Technical rules​

  • Small operation does not mean casual operation; anchor position and symmetry matter.
  • Avoid aggressive tensioning to compensate for a short implant.
  • Confirm that the tape lies flat and centered before closure.
  • Counsel that dyspareunia, exposure, and recurrent SUI remain possible despite the smaller implant.

Evidence Position​

The UK SIMS randomized trial enrolled 596 women across 21 hospitals and found mini-slings noninferior to standard MUS for patient-reported success at 15 months, with patient-reported success maintained through 36 months.[3][5]

A 2025 randomized-trial meta-analysis found SIMS noninferior to standard MUS for patient-reported cure, with shorter operative time, shorter hospital stay, lower postoperative day-1 pain scores, less organ injury, and less groin pain.[4]

Counseling cautions​

IssueSIMS counseling point
Long-term dataStronger through 3 years than beyond 3 years
DyspareuniaHigher signal in SIMS RCT questionnaire responders: 11.7% vs. 4.8%[3]
Mesh exposure3.3% vs. 1.9% in the SIMS RCT[3]
Further surgery for SUI2.5% vs. 1.1% in the SIMS RCT[3]
Device heterogeneitySIMS evidence should not be generalized blindly across all historical mini-sling products

Operative Pearls​

  • SIMS is best framed as a less invasive MUS option, not a universally better sling.
  • Use it in patients whose severity and goals match the evidence base.
  • Keep the follow-up conversation honest: early recovery advantages are real, but long-term comparative data are still younger than RMUS and TMUS.
  • Persistent dyspareunia after SIMS should prompt evaluation for exposure, focal anchor tenderness, tape tension, and pelvic floor myalgia.

References​

1. Carter E, Johnson EE, Still M, et al. "Single-Incision Sling Operations for Urinary Incontinence in Women." Cochrane Database Syst Rev. 2023;10:CD008709. doi:10.1002/14651858.CD008709.pub4

2. Kobashi KC, Vasavada S, Bloschichak A, et al. "Updates to Surgical Treatment of Female Stress Urinary Incontinence (SUI): AUA/SUFU Guideline (2023)." J Urol. 2023;209(6):1091-1098. doi:10.1097/JU.0000000000003435

3. Abdel-Fattah M, Cooper D, Davidson T, et al. "Single-Incision Mini-Slings for Stress Urinary Incontinence in Women." N Engl J Med. 2022;386(13):1230-1243. doi:10.1056/NEJMoa2111815

4. Zhou Y, Chai Y, Zhang Y, Zhou Z. "Application of Single-Incision Mini-Sling Surgery Versus Standard Mid-Urethral Sling Surgery in Female Stress Urinary Incontinence: A Systematic Review and Meta-Analysis of Randomized Controlled Trials." Int J Surg. 2025. doi:10.1097/JS9.0000000000002584

5. Abdel-Fattah M, Cooper D, Davidson T, et al. "Single-Incision Mini-Slings Versus Standard Synthetic Mid-Urethral Slings for Surgical Treatment of Stress Urinary Incontinence in Women: The SIMS RCT." Health Technol Assess. 2022;26(47):1-190. doi:10.3310/BTSA6148