In general, the meniscus third degree injury can not do heavy work. Meniscus injury refers to the knee joint in indirect violence trauma or long-term weight-bearing injury, so that the integrity and continuity of the meniscus has been damaged by a series of clinical symptoms, such as knee pain, swelling, interlocking joints, knee joint activity restrictions, etc., and in severe cases, can be accompanied by quadriceps atrophy, joint popping and so on. According to the severity of meniscus injury under the magnetic magnetic imaging can be divided into four grades: 0 degree, 1 degree, 2 degrees, 3 degrees, 4 degrees, of which 3 degrees of meniscus injury refers to the meniscus appearing in the internal longitudinal or transverse oblique rows, radiating line high signal and reach the articular surface, the meniscus morphology is normal or thin, the surface of the discontinuity. According to the grading standard of meniscus injury, the meniscus injury of 3rd degree and above suggests that the meniscus is obviously torn, and the affected limb should be strictly braked, avoiding weight-bearing, avoiding physical activities, etc., and surgery is needed if necessary. If the meniscus injury occurs, it is recommended that the patient actively cooperate with the doctor to carry out targeted treatment to avoid delaying the condition.