Poster 140: The Effect of Posterior Tibial Slope and Flexion Angle on Posterior Medial Meniscal Root Forces

Objectives: Although the biomechanical and clinical consequences of posterior medial meniscal root (PMMR) tears have been previously reported, these not fully evaluated in terms overall bony morphology. It is well documented that higher flexion angles lead to postero-medial pressure, with many groups proposing PMMR are caused by elevated compression shear forces at when loaded knee high angles. Additionally, several authors advocated increasing tibial plateau slope (PTS) an anatomical risk factor for tears, due insertion site. Thus, purposes this study evaluate across utilizing a novel three-dimensional sensor varying slopes We hypothesized increased angle and/or will result acting on PMMR. Methods: Ten fresh-frozen cadaveric knees (53.2 mean age, all male) were tested combinations three states (5⁰, 10⁰, 15⁰) four (0⁰, 30⁰, 60⁰, 90⁰). A three-axis determines force measurements orthogonal directions was installed below plateau, specimen being mounted load frame which applied 500-N axial load. 5-Nm internal rotational (IR) torque then applied. After IR torque, external The amount compression-tension measured. Results: Increased significantly decreased tension (5°→10°: p = 0.0368, 5°→15°: < 0.0001, 10°→15°: 0.0001) joint compression. anterior internally rotated. 0.0188, externally (0°→30°: 0.0362, 0°→60°: 0.0005, 0°→90°: 30°→90°: 0.0434) 90° (0°→90°: 0.0438, 60°→90°: 0.0005) 30° 0.0004, 30°→60°: 0.0118, Conclusions: PTS results increase horn meniscus loaded. Increases displays seen under This may place stress potential failure after repair. begins provide clinicians information create safer protocols decrease experienced injury or postoperatively.