Laparoscopic Sacral Mesh Fixation for Ventral Rectopexy: Clinical Implications From a Cadaver Study.

Area of Science:

• Surgical anatomy and technique
• Minimally invasive procedures
• Pelvic reconstructive surgery

Background:

• Accurate tack placement is critical in ventral mesh rectopexy to prevent bleeding, nerve damage, and spondylodiscitis.
• Variability in tack positioning can lead to significant complications.

Purpose of the Study:

• To evaluate the precise location of tacks after mesh fixation during laparoscopic ventral mesh rectopexy.
• To assess tack proximity to vital vascular and nerve structures and bony landmarks in the lumbosacral region.

Main Methods:

• An interventional cadaver study involving laparoscopic mesh fixation followed by detailed pelvic dissection.
• 64-row multidetector computed tomography was utilized to analyze lumbosacral anatomy and tack positioning.
• Eighteen fresh cadavers were included, with outcome measures focusing on tack position and potential vascular/neuronal involvement.

Main Results:

• Significant variation in tack placement was observed, with a median distance of 16.1 mm from the midsacral promontory.
• Only 42.3% of tacks were placed in the intended S1 vertebral area; 38.8% of cadavers had all tacks correctly placed.
• While major vessels and ureters were not injured, the hypogastric nerve plexus was affected in all 14 dissected cadavers.

Conclusions:

• Tack placement during ventral mesh rectopexy is highly variable, underscoring the need for reliable anatomical landmarks and adequate surgical exposure.
• Common involvement of the hypogastric nerve plexus necessitates thorough postoperative functional assessment.
• Cadaver studies are essential for refining surgical techniques before clinical application.