Poster 123: Biomechanical Comparison of Four All-inside Meniscus-Based Repairs to Radial Tears of Human Cadaveric Lateral Menisci

Objectives: Meniscal injuries are among the most common orthopedic in United States. Radial meniscus tears were historically treated with partial meniscectomy, often leading to poor outcomes. tear repair preserves meniscal tissue, may delay knee degeneration, and leads better long-term Repair techniques for radial vary should be evaluated differences biomechanical properties failure mechanisms. All-inside, meniscus-based suture repairs have shorter operating times, minimize risk of nerve injury, increasingly possible novel devices. Our objective was evaluate strength based on load-to-failure four all-inside human cadaveric lateral menisci. We chose two that bridged directly – Double Vertical (DV, Figure 1) Cross (DVX, 2). other added horizontal reinforcing stitches engage bridging All-inside Rebar (AR, 3) our Oblique Box (OB, 4). hypothesized AR OB would higher load than DV DVX. Methods: 36 fresh-frozen adult menisci randomized into groups nine. Dissection, repair, testing completed one at a time period from thawing testing. Each dissected its tibial bone block, complete created midbody meniscus. Suture performed using 2-0 braided straight needle. Menisci repaired DV, DVX, AR, meniscus- suturing simulate all-inside, approach. All dimensions standardized as indicated Figures 1-4, all knots tied superior surface The patterns types used loops passed above below inferior surfaces sutures perpendicular tear. DVX crossed over parallel acting rebar outside sutures. create trapezoidal box either side inside box. loaded an Instron 5944 test frame 2 kN cell custom clamps. They underwent cyclic loading 5-30 N 500 cycles 10 mm/min, 30-minute resting period, single trial mm/min. ultimate analyzed via one-way ANOVA Tukey’s pairwise comparisons significance set p<0.05. Results: Failure occurred due cutout specimens. constructs lacked reinforcing-type (DV DVX) cut through or “cheese-wired” lower loads (AR OB). Mean ± standard deviation values each group 60 24.5 58 17.4 168 33.9 105 9.0 OB. significantly different by exception comparison. These results show vertical some type (e.g. OB) increases techniques. Conclusions: In model, suture, techniques, had reduced “cheese wiring”. sustained highest failure, nearly 3x stronger non-reinforcing constructs. data provide useful information surgeons during tears. Future study compare vs. inside-out maximize patient reference clinical outcomes prospective registry support optimal surgical improve