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Table 4 Outerbridge classification

From: Factors affecting Baker cyst volume, with emphasis on cartilage lesion degree and effusion in the young and middle-aged population

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

Grade 2

partial-thickness defect of the cartilage

Grade 3

fissuring of the cartilage to the level of the subchondral bone

Grade 4

exposed subchondral bone