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Table 2 Modified Noyes grading system for cartilage grading according to MRI abnormalities appearance [11, 12]

From: Comparison of 2D Fat Suppressed Proton Density (FS-PD) and 3D (WATS-c) MRI pulse sequences in evaluation of chondromalacia patellae

GradeDescription
Grade 0Normal cartilage
Grade 1There is increased T2 signal intensity of morphologically normal cartilage not oriented at 55°to the external magnetic field
Grade 2AThere is superficial partial-thickness cartilage defect less than 50% of total articular surface thickness
Grade 2BThere is deep partial-thickness cartilage defect more than 50% of total articular surface thickness
Grade 3Full-thickness cartilage defect