International Journal of Surgical Research

Objective To analyze the biomechanical characteristics of anterior and posterior cruciate ligament during knee flexion and extension. Methods: A healthy adult male was included in this study. A 3D finite element model of knee joint was made with the support of 1.5TMRI machine, medical imaging software, finite element analysis software and other equipment. The stress distribution and magnitude of anterior and posterior cruciate ligaments of knee joints were simulated under different load conditions when knee joints were flexed at 0°, 30°, 60° and 90°. At the same time, the posterior cruciate ligament samples were taken, and the machine was driven to apply tensile stress to them. The maximum tensile load and stress were counted until the pattern was broken. Results: The anterior and posterior displacements were the largest at 30° flexion, the internal and external displacements were the largest at 90° flexion, the internal and external rotation angles were the largest at 60° flexion, and the internal and external rotation angles were the largest at 30° flexion. When the knee joint was subjected to 134N posterior femoral load, the maximum stress was sustained by the ACL at 30° flexion and the maximum stress was sustained by the ACL at 90° flexion. Under varus 10Nm load, valgus 10Nm load, and 10Nm varus +5Nm internal rotation load, the ACL bore the maximum stress at 0° flexion and the posterior cruciate ligament bore the maximum stress at 90° flexion. The maximum tensile load of the knee joint was 367.65N, and the maximum stress of the posterior cruciate ligament was 19.34mpa. Conclusion: The stress of knee joint under different flexion conditions is different and the risk of injury is different. At the same time, the stretching performance of the posterior cruciate ligament is good, which can prevent knee sprain.

knee joint; Anterior and posterior cruciate ligaments; biomechanics