Although it has been recognized that the medial meniscus extrusion (MME) leads to progressive cartilage loss and osteoarthritis (OA), about 20% of cases with MME had minor symptoms and poor progression of knee OA. However, it is still unclear which patients will have minimal symptoms or will not progress to degeneration. The purpose of this study is to compare the effect of the relationship between the MME and Joint line convergence angle (JLCA) on knee stress with the finite element (FE) analysis method. The 65 year-old female was taken computer tomography (CT) from thigh to ankle. A 3-dimentional nonlinear FE model was constructed from the patient’s DICOM data. We made the six models, which was different from JLCA and MME. Contact stresses on the surfaces between femoral and tibial cartilages and both side of meniscus are analyzed. As the JLCA or MME increased, the stress load on the medial compartment increased. The effect of MME was stronger on the femoral side, while the effect of JLCA was stronger for the tibia and meniscus. If the JLCA was tilted valgus, the stress in the medial compartment did not increase even in the presence of MME. This study revealed that the MME is associated with increased a stress loading on medial compartment structures. Furthermore, this change was enhanced by the varus tilt of the JLCA. In the case of valgus alignment, the contact pressure of the medial compartment did not increase so much even if with the MME. Level V

中文翻译：

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内侧半月板挤压和关节线会聚角的内翻倾斜增加了膝关节伸展位置膝关节内侧隔室的应力-有限元分析-

尽管已经认识到内侧半月板挤压 (MME) 会导致进行性软骨丢失和骨关节炎 (OA)，但大约 20% 的 MME 病例有轻微症状和膝关节 OA 进展不良。然而，目前尚不清楚哪些患者症状最小或不会进展为退行性变。本研究的目的是通过有限元（FE）分析方法比较MME和关节线收敛角（JL​​CA）之间的关系对膝关节应力的影响。这位 65 岁的女性接受了从大腿到脚踝的计算机断层扫描 (CT)。从患者的 DICOM 数据构建了一个 3 维非线性有限元模型。我们做了六个模型，这与 JLCA 和 MME 不同。分析了股骨和胫骨软骨之间​​以及半月板两侧表面上的接触应力。随着 JLCA 或 MME 的增加，内侧隔室的应力负荷增加。MME对股骨侧的作用更强，而JLCA对胫骨和半月板的作用更强。如果 JLCA 是倾斜外翻，即使存在 MME，内侧隔室的应力也不会增加。这项研究表明，MME 与内侧隔室结构上的应力负荷增加有关。此外，这种变化因 JLCA 的内翻倾斜而增强。在外翻对齐的情况下，即使使用 MME，内侧隔室的接触压力也不会增加太多。第五级 即使存在 MME，内侧隔室的压力也不会增加。这项研究表明，MME 与内侧隔室结构上的应力负荷增加有关。此外，这种变化因 JLCA 的内翻倾斜而增强。在外翻对齐的情况下，即使使用 MME，内侧隔室的接触压力也不会增加太多。第五级 即使存在 MME，内侧隔室的压力也不会增加。这项研究表明，MME 与内侧隔室结构上的应力负荷增加有关。此外，这种变化因 JLCA 的内翻倾斜而增强。在外翻对齐的情况下，即使使用 MME，内侧隔室的接触压力也不会增加太多。第五级