After healing from a 3rd degree meniscus injury, there is usually no fluid buildup. Meniscus 3 degree injury, through conservative treatment is difficult to achieve healing, the main meniscus repair surgery, usually in about 3 months can achieve healing. Fluid accumulation in the joints is because of the aseptic inflammation caused by synovial membrane hyperplasia and hypertrophy due to meniscus injury of the 3rd degree, the joint fluid secretion increases and accumulates abnormally in the joint cavity, and the fluid accumulation in the joints will disappear gradually with the prolongation of time through bed rest. If there is fluid in the joint, hot compresses or ultrashort wave physiotherapy can be used to improve circulation and promote fluid absorption. Meniscus 3 degree injury, it is recommended to consult a doctor in time, under the guidance of the doctor, targeted treatment.