AI Article Synopsis
- The study investigates how the menisci in the knee move during internal and external rotations using advanced MRI technology with motion correction.
- A total of 31 healthy participants underwent MRI scans that quantified meniscal movements under specific torque conditions, revealing significant differences based on the direction of rotation.
- Results showed that the medial meniscus (MM) and lateral meniscus (LM) had distinct movement patterns, with the LM showing more variability during rotations, highlighting the complex nature of knee joint mechanics.
Article Abstract
Purpose: 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. METHODS: 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. RESULTS: 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.
Conclusions: 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 Of Evidence: Level II.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9530101 | PMC |
| http://dx.doi.org/10.1186/s40634-022-00540-5 | DOI Listing |
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