MRI grading system for abnormal meniscal signal intensity
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At the time the article was created Mohammad Salem had no recorded disclosures.View Mohammad Salem's current disclosures
At the time the article was last revised Henry Knipe had the following disclosures:
- Radiopaedia Events Pty Ltd, Speaker fees (past)
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
These were assessed during peer review and were determined to not be relevant to the changes that were made.View Henry Knipe's current disclosures
MRI grading system for abnormal high meniscal signal intensity was reported by Lotysch et al.
Grade 1 to 3 have been described on MRI:
- grade 1: small focal area of hyperintensity, no extension to the articular surface
grade 2: linear areas of hyperintensity, no extension to the articular surface
- 2a: linear abnormal hyperintensity with no extension to the articular surface
- 2b: abnormal hyperintensity reaches the articular surface on a single image
- 2c: globular wedge-shaped abnormal hyperintensity with no extension to the articular surface
- grade 3: abnormal hyperintensity extends to at least one articular surface (superior or inferior), and is referred to as a definite meniscal tear
Grade 2 meniscal signal was found to be associated with a meniscal tear on arthroscopy. Therefore, grade 2 was further subdivided into 2a, 2b, and 2c. Dillon et al. found that 50% of patients with grade 2c had meniscal tears on arthroscopy.
- 1. Li C, Kim M, Kim I, Lee J, Jang K, Lee S. Correlation of Histological Examination of Meniscus with MR Images: Focused on High Signal Intensity of the Meniscus Not Caused by Definite Meniscal Tear and Impact on Mr Diagnosis of Tears. Korean J Radiol. 2013;14(6):935-45. doi:10.3348/kjr.2013.14.6.935 - Pubmed
- 2. Lotysch M, Mink J, Crues JV, Schwartz SA. Magnetic resonance imaging in the detection of meniscal injuries (abstract). Magn Reson Imaging 1986;4:185.
- 3. Dillon E, Pope C, Jokl P, Lynch K. The Clinical Significance of Stage 2 Meniscal Abnormalities on Magnetic Resonance Knee Images. Magn Reson Imaging. 1990;8(4):411-5. doi:10.1016/0730-725x(90)90049-8 - Pubmed