The menisci transmit load between femur and tibia and thus play a crucial role in the functionality of the knee joint. Knee joint movements have a major impact on the position of the menisci. However, these meniscus movements have not yet been assessed in a validated setting. The objective of this study is to evaluate the meniscal movements in MRI with prospective motion correction based on optical tracking under loading via internal and external tibial torques. Thirty-one healthy volunteers were recruited for this study. MRI scans were performed in internal and external rotation induced by a torque of 5 Nm, using a 3 T MRI. A validated software used the generated images to calculate the absolute meniscus movements as the sum of all vectors. Differences between subgroups were analyzed by using a Wilcoxon signed-rank test. The MM shows an average movement of 1.79 mm in anterior-lateral direction under internal rotation and 6.01 mm in posterior-lateral direction under external rotation, whereas the LM moves an average of 4.55 mm in posterior-medial direction under internal rotation and 3.58 mm in anterior-medial direction under external rotation. When comparing the overall meniscus movements between internal and external rotation, statistically significant differences were found for total vector length and the direction of meniscus movements for medial and lateral meniscus. The comparison between medial and lateral meniscus movements also showed statistically significant differences in all categories for internal and external rotation. Overall, the MM and LM movements in internal and external rotation differ significantly in extent and direction, although MM and LM movements in opposite directions during internal and external rotation can be observed. In internal rotation, most meniscus movements were found in the IHLM. In external rotation, the IHMM showed the greatest mobility. Segment analysis of internal vs. external rotation showed less difference in LM movements than MM. Level II.

中文翻译：

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负载下内旋和外旋时膝关节半月板运动的体内评估

半月板在股骨和胫骨之间传递负荷，因此在膝关节的功能中起着至关重要的作用。膝关节运动对半月板的位置有重大影响。然而，这些半月板运动尚未在经过验证的环境中进行评估。本研究的目的是评估 MRI 中的半月板运动，并通过内部和外部胫骨扭矩基于负载下的光学跟踪进行前瞻性运动校正。本研究招募了 31 名健康志愿者。使用 3 T MRI 在由 5 Nm 的扭矩引起的内部和外部旋转中进行 MRI 扫描。一个经过验证的软件使用生成的图像来计算绝对半月板运动作为所有矢量的总和。通过使用 Wilcoxon 符号秩检验分析亚组之间的差异。MM 显示在内旋时前外侧方向平均移动 1.79 mm，外旋时后外侧方向平均移动 6.01 mm，而 LM 在内旋时后内侧方向平均移动 4.55 mm，在内旋时平均移动 3.58 mm外旋下的前后方向。在比较内旋和外旋之间的整体半月板运动时，发现内侧和外侧半月板的总矢量长度和半月板运动方向存在统计学显着差异。内侧和外侧半月板运动之间的比较也显示了所有类别的内旋和外旋在统计学上的显着差异。总体而言，内旋和外旋的 MM 和 LM 运动在程度和方向上存在显着差异，尽管可以观察到在内外旋转过程中 MM 和 LM 的运动方向相反。在内旋中，大多数半月板运动发生在 IHLM 中。在外旋中，IHMM 表现出最大的机动性。内部与外部旋转的分段分析显示 LM 运动的差异小于 MM。二级。