Meniscal tear grading. The schematic diagrams on the top depict meniscal tear grades with corresponding sagittal MR images on the bottom. Grade 0, normal intact meniscus; Grade I, intrasubstance globular-appearing signal not extending to the articular surface; Grade II, linear increased signal patterns not extending to the articular surface; Grade III, abnormal signal intersects the superior and/or inferior articular surface of the meniscus, an arthroscopically confirmable tear. Red arrows indicate tear location.



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