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MRI grading system for abnormal high meniscal signal intensity reported by Lotysch et al.
Normal meniscus should appear as a uniform low-signal (dark) triangular structure in sagittal MRI images.
- normal: No abnormal signal intensity
- 1: small focal area of increased signal intensity, with no extension to the articular surface
- 2a: linear abnormal signal intensity with no extension to the articular surface
- 2b: abnormal signal intensity reaches the articular surface, but on a single image
- 2c: globular wedge-shaped abnormal signal intensity with no extension to the articular surface
- 3: abnormal high signal intensity extends to at least one articular surface (superior or inferior). This type is referred as a definite meniscal tear.