Department of Orthopaedics, The Fifth Affiliated Hospital, Southern Medical University, Guangzhou, Guangdong Province, 510999, China.
J Orthop Sci. 2024 Jul;29(4):995-1002. doi: 10.1016/j.jos.2023.05.015. Epub 2023 Jul 6.
This study aimed to analyze the stress and strain changes of the anterior cruciate ligament (ACL) at different knee flexion angles using a three-dimensional finite element model.
Computed tomography and magnetic resonance imaging scans were performed on the right knee of 30 healthy adult volunteers. The imaging data were used to construct a three-dimensional finite element model of the knee joint. The magnitude and concentration area of stress and strain of ACL at knee flexion angles 0°, 30°, 60° and 90° were assessed.
The magnitude of stress remained consistent at 0-30° (P > 0.999) and decreased at 30-90° (P < 0.001, P = 0.005, respectively), while the magnitude of strain increased between 0° and 30° (P = 0.004) and decreased between 30° and 90° (P < 0.001, P = 0.004, respectively). The stress concentration area remained consistent at the proximal end, midsubstance, and distal end between 0° and 60° (P > 0.05). The concentration area of strain increased at the proximal end, decreased at the midsubstance between 0° and 30°, and remained consistent between 30° and 90° (P < 0.001).
At the low knee flexion angle, ACL's magnitude of stress and strain reached the peak, and the concentration area of ACL strain gradually shifted from midsubstance to the proximal end.
本研究旨在使用三维有限元模型分析不同膝关节屈曲角度下前交叉韧带（ACL）的应力和应变变化。
对 30 名健康成年志愿者的右膝进行计算机断层扫描和磁共振成像扫描。使用成像数据构建膝关节三维有限元模型。评估膝关节屈曲角度为 0°、30°、60°和 90°时 ACL 的应力和应变的大小和集中区域。
在 0-30°时，应力大小保持一致（P>0.999），在 30-90°时减小（P<0.001，P=0.005），而应变大小在 0°和 30°之间增加（P=0.004），在 30°和 90°之间减小（P<0.001，P=0.004）。在 0°和 60°之间，应力集中区域在近段、中段和远段保持一致（P>0.05）。应变集中区域在近段增加，在中段在 0°和 30°之间减少，在 30°和 90°之间保持一致（P<0.001）。
在低膝关节屈曲角度时，ACL 的应力和应变大小达到峰值，ACL 应变的集中区域逐渐从中段向近段转移。
