Relationship between medial meniscus movement and internal rotation of the tibia using magnetic resonance imaging

Physiotherapy ◽  
2015 ◽  
Vol 101 ◽  
pp. e1148
Author(s):  
M. Onodera ◽  
J. Kurokawa ◽  
K. Sato
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Internal Rotation ◽  
Medial Meniscus ◽  
Resonance Imaging

Magnetic Resonance Imaging Findings of Surgically Proven Medial Meniscus Root Tear

2008 ◽  
Vol 32 (3) ◽  
pp. 452-457 ◽  
Author(s):  
Yong Gu Lee ◽  
Jae-Chan Shim ◽  
Yun Sun Choi ◽  
Jin Goo Kim ◽  
Ghi Jai Lee ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Medial Meniscus ◽  
Imaging Findings ◽  
Resonance Imaging ◽  
Root Tear ◽  
Meniscus Root ◽  
Meniscus Root Tear

scholarly journals Dynamics of the meniscus underweight-loading conditions: an investigation using upright magnetic resonance imaging

2020 ◽  
Vol 8 (7_suppl6) ◽  
pp. 2325967120S0045
Author(s):  
Junsuke Nakase ◽  
Kengo Shimozaki ◽  
Rikuto Yoshimizu ◽  
Hiroyuki Tsuchiya ◽  
Kazuki Asai
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Supine Position ◽  
Medial Meniscus ◽  
Lateral Meniscus ◽  
Loading Conditions ◽  
Resonance Imaging ◽  
Significant Difference ◽  
Posterior Shift ◽  
Weight Loading

Objectives: Meniscal morphology underweight-loading conditions remains unknown, because weight loading is rarely performed during magnetic resonance imaging (MRI). We focused on the weight-loading condition and developed an upright MRI. This study aimed to investigate the shift of the medial and lateral meniscus in healthy adults under both fully weight loaded and unloaded conditions, using both supine and upright MRI. Methods: Eighteen volunteers (13 men and 5 women) without previous knee complaints underwent an MRI of the right knee. The mean age of the subjects was 21.8±3.1 years. The examination was performed in three positions: supine, double-leg upright (DLU), and single-leg upright (SLU). The knees were fully extended in each position. For both the supine and upright examinations, we used a special MRI apparatus (Gravity MRI, Hitachi, Japan) that is capable of imaging in any position with a static magnetic field strength of 0.4 T (Figure). T1-weighted images were obtained in both coronal and sagittal planes with a slice thickness of 2 mm. The medial or lateral, anterior and posterior shifts of both the medial and lateral meniscus were measured, against the tibial wedge. The medial and lateral meniscal shift rates were measured as assessment items under each condition. The shift rate was defined as the proportion of the measured meniscal shift compared to the overall width of the medial and lateral meniscus. The MRI reference section on the sagittal plane was the midpoint of the medial or lateral femoral condyle. On the coronal plane, the reference point was the midpoint of the medial and lateral tibial condyle. The measurement items were compared in all three imaging positions using analysis of variance and multiple comparison tests, with statistical significance set at P < 0.05. Results: We show the results from the analysis of the dynamics of the medial and lateral meniscus in Table. The difference among the three conditions for the medial shift rate of the medial meniscus was significant. The medial shift rate was significantly greater in the DLU and SLU positions than in the supine position (supine: 7.3±5.8% vs. DLU: 20.0±8.8 % (P<0.01), supine vs. SLU: 21.5±7.6% (P<0.01), DLU vs. SLU (P=0.7)). No significant differences were observed for the anterior and posterior shift rates of the medial meniscus (anterior: P=0.6, posterior: P=0.4). In the lateral meniscus, the lateral shift rate was significantly greater in the SLU position than in the supine position, but no significant difference was observed in the DLU position (supine: -1.2±11.8% vs. DLU: 2.7±11.1 % (P=0.2), supine vs. SLU: 4.5±10.8% (P=0.04), DLU vs. SLU: P=0.7). Both anterior and posterior shift rates in the lateral meniscus were significantly greater in DLU and SLU positions than in the supine position (anterior/ supine: -20.6±14.3% vs. DLU: -14.7±12.2% (P<0.01), supine vs. SLU: -8.9±14.9% (P<0.01), DLU vs. SLU: P=0.3, posterior/ supine: -78.0±19.6% vs. DLU: -63.7±18.7 % (P<0.01), supine vs. SLU: -57.8±19.2% (P<0.01), DLU vs. SLU: P=0.4). Conclusions: Under upright weight-loading conditions, the medial meniscus showed only medial shift, whilst the lateral meniscus was seen to shift in lateral, anterior, and posterior directions. No significant difference was observed between the DLU and SLU shift rates in both the medial and lateral meniscus in healthy adults. We believe that this result will be useful when considering loading and rehabilitation following meniscal repair. [Table: see text]

scholarly journals Diagnostic Accuracy of Magnetic Resonance Imaging in the Detection of Type and Location of Meniscus Tears: Comparison with Arthroscopic Findings

2021 ◽  
Vol 10 (4) ◽  
pp. 606
Author(s):  
Seong Hwan Kim ◽  
Han-Jun Lee ◽  
Ye-Hoon Jang ◽  
Kwang-Jin Chun ◽  
Yong-Beom Park
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Diagnostic Accuracy ◽  
Medial Meniscus ◽  
Cruciate Ligament ◽  
Lateral Meniscus ◽  
Meniscal Tears ◽  
Resonance Imaging ◽  
Arthroscopic Findings ◽  
Meniscus Tears

Magnetic resonance imaging (MRI) has been widely used for the diagnosis of meniscal tears, but its diagnostic accuracy, depending on the type and location, has not been well investigated. We aimed to evaluate the diagnostic accuracy of MRI by comparing MRI and arthroscopic findings. Preoperative 3.0-T MRI and arthroscopic findings from 2005 to 2018 were reviewed to determine the presence, type, and location of meniscus tears. In addition, subgroup analysis was performed according to anterior cruciate ligament (ACL) injury. The exclusion criteria were as follows: (1) Inflammatory arthritis, (2) other ligament injuries, (3) inability to classify meniscal tears due to degenerative arthritis, (4) over 90 days from MRI to surgery, and (5) incomplete data. Of the 2998 eligible patients, 544 were finally included. The sensitivity and specificity of MRI in determining medial and lateral meniscus tears were 91.8% and 79.9%, and 80.8% and 85.4%, respectively. The accuracy of MRI in the ACL-injured group was lower than that in the ACL-intact group (medial meniscus: 81.7% vs. 88.1%, p = 0.041; 72.9% vs. lateral meniscus: 88.0%, p < 0.001). MRI accuracy was low for the longitudinal tears of the posterior horn of the medial meniscus in the ACL-injured group. MRI could be a diagnostic tool for meniscus tears, but has limited accuracy in their classification of the type and location. Hence, care should be taken during arthroscopic assessment of ACL-injured patients due to low diagnostic accuracy of preoperative MRI.

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