Meniscus damage is divided into several degrees

After meniscus injury, the degree of meniscus injury can be judged by MRI of knee joint, and the classification of injury can be divided into Ⅰ-Ⅲ degree clinically. The normal performance of Ⅰ degree injury on MRI is localized signal elevation in meniscus, and histological performance is mucoid degeneration in meniscus. Grade II lesions show a level of slightly higher signal intensity in the meniscus, which can reach from the capsular margin to the free margin of the meniscus, but does not affect this joint margin. Grade II MRI shows mucoid degeneration of the meniscus, which is larger than that of Grade I, but there is no obvious visible crack. Most menisci with grade I-II injuries can be healed well after conservative treatment. Grade III injuries are more serious than grade I-II injuries on MRI, that is to say, the high signal intensity in the meniscus has already involved the articular edge of the meniscus. In grade III injuries, MRI can see tears of fibrocartilage, among which 5%-6% of cases are intra-meniscal tears. If arthroscopy is used, it is possible to see a full-course tear of the entire meniscus. In the third degree, most injuries require surgery for meniscal suture or hemi-meniscoplasty.