The modified Noyes system was published in 2009. It is a modification of the Noyes grading system for the purpose of MRI grading. The original Noyes grading system was based on arthroscopic findings.
Grade | Description |
---|---|
Grade 0 | normal cartilage |
Grade 1 | increased T2 signal intensity of morphologically normal cartilage not oriented at 55° to the external magnetic field |
Grade 2A |
The modified Outerbridge system was published in 2006. It differs from the Outerbridge system in grade I only, the definition of which was adjusted to reflect changes on MRI, because the original system was based on arthroscopic findings.
Grade | Description |
---|---|
Grade 0 | normal cartilage |
Grade 1 | signal intensity alterations with an intact surface of the articular cartilage compared with the surrounding normal cartilage |