The symptoms of meniscus injury of degree I-II are as follows: 1. Significant pain in the knee joint, which is due to the stimulation of small nerves after meniscus injury, and the formation of local inflammatory edema, which will stimulate the peripheral nerves and cause significant pain, and when the knee is twisted in a semi-flexed position, because the tibia and femur will further squeeze the meniscus, which will lead to a significant increase in knee pain. 2. 2. Local swelling is due to small blood vessel rupture and bleeding after meniscal injury, resulting in the accumulation of local bruising and inflammatory edema, which will lead to local swelling. 3. Knee joint movement is unfavorable, mainly due to pain after knee meniscal injury and inflexible knee joint movement. Because of the meniscus injury in the knee joint after walking when the meniscus is prone to compression, irritation, pain is more obvious, resulting in the knee joint appeared to play the symptoms of leg weakness.