MRI grading system for abnormal meniscal signal intensity
Citation, DOI & article data
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