The difference between meniscal injury and synovitis mainly includes the difference in etiology, clinical manifestations and imaging, as follows: 1. etiology: meniscal injury is usually acute trauma or chronic cumulative injury, while synovitis is usually trauma, degenerative synovitis, etc. 2. clinical manifestations: meniscal injury will mostly have knee pain, mainly pain from weight bearing and knee flexion and extension activities, and in severe cases there can be joint The symptoms of interlocking, while synovitis will show joint swelling, joint effusion, limited joint movement, and a significant increase in joint skin temperature. 3. imaging: imaging examinations, such as MRI, will show a linear high signal shadow inside the meniscus, while synovitis will show inflammatory hyperplasia, joint effusion and other changes on the MRI. Therefore, there is a clear distinction between meniscal injury and synovitis.