Medial Meniscal Ramp Lesion Repair Concomitant With Anterior Cruciate Ligament Reconstruction Did Not Contribute to Better Anterior Knee Stability and Structural Properties After Cyclic Loading: A Porcine Model

Abstract

Purpose: To investigate the biomechanical efficacy of medial meniscal ramp lesion (MMRL) repair in anterior cruciate ligament (ACL) reconstruction regarding the graft protection effect after cyclic loading. Methods: Specimens were randomized into 2 groups: (1) ACL reconstruction with unaddressed MMRL (Group U; n ¼ 10), and (2) ACL reconstruction with repaired MMRL (Group R; n ¼ 12). The specimens were tested cyclically (2,000 cycles, 0-40 N, 100 mm/ min) in the direction of the native ACL and loaded to failure (100 mm/min) on a tensile tester. Statistically significant differences between the structural properties (length changes and anterior translations at the 100th, 500th, 1,000th, 1,500th, and 2,000th cycles, upper yield load, maximum load, linear stiffness, and elongation at failure) under cyclic loading and single-cycle loading were analyzed. Results: There were no significant differences in length changes and anterior translations at the 100th, 500th, 1,000th, 1,500th, and 2,000th cycles. There were no significant differences in upper yield load (82.4

Relationship Between Achilles Tendon Stiffness Using Myoton PRO and Translation Using a Tensile Testing Machine: A Biomechanical Study of a Porcine Model

“…The present large-animal study showed that dynamic stiffness, measured using Myoton PRO, exhibited a moderate correlation with length change, measured using biomechanical machines, at both AT0 and AT2, consistent with the findings of the human AT study [ 15 ]. Biomechanical testing using tensile testing machines on porcine anterior cruciate and medial collateral ligaments has been reported [ 19 - 20 ]. Significant length changes, as observed with the long-axis method, indicate greater translation of the tissue and softer tissue.…”

“…Sutures were then placed proximal to the AT. The calcaneus was inserted into aluminum tubes with cement [ 19 - 20 ].…”

“…The change in length during the cyclic loading was recorded. These conditions have been frequently used for measurements in previous studies using large-animal models [ 19 - 20 ].…”

Comparison of Electrothermal Ablation and Electrolyte Plasmalization Devices Based on the Mechanical Properties of Anterior Cruciate Ligament Femoral Attachment Following Partial Debridement: A Biomechanical Study Using a Porcine Model

“…For better visualization of the femoral ACL attachment, the distal medial condyle of the femur was also dissected. All paired right and left FAT complexes were potted in aluminum tubes [5][6][7][8][9][10] (Figure 1).…”

ACL surgery: reasons for failure and management

“…This is based on a classification, where both pathologies, true ramp lesions and vertical peripheral longitudinal meniscus tears, were recently counted as ramp lesions ( 41 ). The biomechanical studies are controversial ( 42 ), and the clinical studies failed so far to show an advantage of repairing ramp lesions compared to arthroscopic refreshing. There is one published RCT with 73 patients that did not show an advantage to repair after a minimum follow-up of 2 years ( 43 ).…”