Anatomic comparison of two transobturator tape procedures

Area of Science:

• Urology
• Female Pelvic Medicine and Reconstructive Surgery
• Anatomy

Background:

• Transobturator tape placement for stress urinary incontinence involves two main techniques: inside-out and outside-in.
• Understanding the anatomical proximity of these tapes to critical structures is crucial for surgical safety.

Purpose of the Study:

• To compare the inside-out and outside-in transobturator tape placement methods.
• To evaluate the proximity of the placed tape to the obturator canal and ischiopubic ramus.

Main Methods:

• Seven fresh frozen cadavers were used for bilateral transobturator tape placement.
• Inside-out (TVT-Obturator System) and outside-in (Monarc) methods were employed.
• Dissection to the obturator membrane allowed measurement of tape distances to the obturator canal and ischiopubic ramus.

Main Results:

• Inside-out technique resulted in tapes significantly closer to the obturator canal (1.3 cm vs. 2.3 cm, P<.001).
• Inside-out technique placed tapes farther from the ischiopubic ramus (0.39 cm vs. 0.04 cm, P=.008).
• Left-sided placements were consistently farther from the obturator canal than right-sided placements.

Conclusions:

• The outside-in technique positions the mesh farther from the obturator canal and closer to the ischiopubic ramus.
• This anatomical positioning may theoretically reduce the risk of neurovascular injury during transobturator tape procedures.