A simple modification to add strength to the Roeder knot

Area of Science:

• Surgical Techniques
• Minimally Invasive Surgery
• Laparoscopy

Background:

• The Roeder knot is a common choice for extracorporeal tying in laparoscopic surgery.
• Standard Roeder knots are known to be weaker than surgeon-controlled knots with multiple throws.
• Existing methods for laparoscopic knot tying present challenges in achieving optimal security.

Purpose of the Study:

• To compare the tensile strength of the standard Roeder knot with a modified version.
• To evaluate the efficacy of an enhanced Roeder knot for laparoscopic applications.
• To determine if a modified Roeder knot offers improved security for surgical ligations.

Main Methods:

• A modified Roeder knot was created by adding a fourth loop and a second half-hitch.
• Tensile strength testing was performed on both standard and modified Roeder knots.
• Statistical analysis (p < 0.05) was used to compare knot strengths.

Main Results:

• The modified Roeder knot demonstrated significantly greater tensile strength (26.6 +/- 15.3 N) compared to the standard Roeder knot (18.0 +/- 12.1 N).
• The modification resulted in a statistically significant improvement in knot security.
• The enhanced knot maintained the advantage of single-pass deployment.

Conclusions:

• A modified Roeder knot offers superior strength and security for laparoscopic suturing compared to the standard technique.
• This modified knot is recommended for ligating pedicles during laparoscopy when a single-pass extracorporeal knot is desired.
• The findings suggest a practical improvement for surgeons performing minimally invasive procedures.