Optimizing arthroscopic knots using braided or monofilament suture

Area of Science:

• Orthopedic surgery
• Biomaterials science
• Surgical techniques

Background:

• Surgical knot security is crucial for successful procedures.
• Suture material properties significantly influence knot performance.
• Understanding knot behavior with different suture types is essential for surgeons.

Purpose of the Study:

• To compare the security of various arthroscopic knots tied with braided polyester suture.
• To compare the performance of these knots with similar knots tied using monofilament suture.
• To evaluate the impact of knot configuration and post-switching on knot security.

Main Methods:

• Ten different arthroscopic knot configurations were tested using permanent braided polyester suture.
• Knots included cinching knots, half-hitches, the taut-line hitch, and the Revo knot.
• Cyclic loading followed by ultimate load to failure was applied, with clinical failure defined as 3 mm loop displacement.

Main Results:

• The Duncan loop with switched-post half-hitches and the Revo knot demonstrated the highest knot-holding capacities for braided suture (87N and 92N, respectively).
• Knots without post switching showed significantly lower load capacities compared to those with post switching.
• Braided switched-post configurations exhibited reduced cyclic displacement (0.7 mm) compared to monofilament configurations (1.7 mm).

Conclusions:

• Knot security is highly dependent on both the knot configuration and the suture material used.
• The Duncan loop and Revo knot are strong choices for braided polyester sutures in arthroscopic surgery.
• Surgeons must test knot strength with specific suture materials before clinical application to ensure patient safety.