A Self-Tension Screw for Meniscal Root Repair: Biomechanical Properties and Design Considerations for Optimal...

Area of Science:

• Orthopedics
• Biomechanical Engineering
• Sports Medicine

Background:

• Meniscus root tears significantly impair knee function and joint stability.
• Current repair methods like the transtibial pull-out technique face challenges with meniscus root displacement and stabilization.
• Improving surgical outcomes for meniscus root tears is critical for patient recovery and long-term joint health.

Purpose of the Study:

• To introduce and biomechanically evaluate a novel self-tension screw for meniscus root repair.
• To compare the performance of the new self-tension screw against a conventional washer screw system.
• To address limitations in manual tensioning and stabilization during meniscus root repair procedures.

Main Methods:

• Biomechanical evaluation using 14 bovine cadaveric knee specimens.
• Comparison of a novel self-tension screw with a conventional washer screw system.
• Cyclic loading, load-to-failure, and stiffness analyses were performed.

Main Results:

• Cyclic loading showed comparable displacement between the self-tension screw (3.09 ± 0.26 mm) and washer screw (2.63 ± 0.73 mm).
• The washer screw demonstrated significantly superior load-to-failure tolerance (391.34 ± 60.20 N) compared to the self-tension screw (136.58 ± 25.48 N).
• Stiffness analysis revealed greater structural stability with the washer screw (22.77 ± 4.23) than the self-tension screw (15.2 ± 4.89).

Conclusions:

• The novel self-tension screw exhibited lower load tolerance and stiffness compared to the conventional washer screw system.
• While the self-tension mechanism aims to simplify fixation, current biomechanical results suggest limitations in achieving robust joint stabilization.
• Further development is warranted to enhance the mechanical performance of self-tensioning devices for meniscus root repair.