Meniscal injuries are common in sports injuries, with a prevalence of approximately 2.5:1 in men and women, and lateral meniscal injuries are more common in the national population. The common clinical manifestations after meniscal injury include limited pain, joint swelling, popping and interlocking, quadriceps atrophy, playing soft leg, and definite pressure pain in the knee joint space or meniscus area. 1. Mobility examination: There is usually no significant restriction or only mild limitation of flexion and extension, but if there is interlocking then mobility is significantly limited. 2.Floating patellar test and effusion induced test: joint effusion can be checked, in acute injury or when the symptoms of old injury are more obvious. 3, quadriceps atrophy: apply a dermatome to measure the circumference of the quadriceps at 10 cm on the patella bilaterally, generally there will be atrophy in old injuries, and the medial head is predominant. 4, joint gap convexity and pressure pain: there is limited pressure pain along the medial and lateral gaps of the knee or around the meniscus, and there may be prominence in the joint gap on the injury side, due to unstable protrusion of the meniscus after injury, as well as inflammation and swelling of the synovial membrane around the injured meniscus, with obvious pressure pain. Protrusion should be considered as a possible meniscal cyst. 5, McMurray test Patient supine, the examiner with one hand against the medial edge of the joint, control the medial meniscus, the other hand to hold the foot, so that the knee fully flexed, the lower leg external rotation inward, and then slowly extend the knee joint, can hear or feel the popping or bouncing; and then the hand against the lateral edge of the joint, control the lateral meniscus, the lower leg internal rotation outward, slowly extend the knee joint, hear or feel the popping or bouncing. If you hear or feel a popping or bouncing, the test is positive. This test is not very sensitive, about 60, and a negative test does not mean that there is no meniscal tear. McMurray’s test produces a popping sound or sudden pain as described by the patient during the examination, which often has some significance for the localization of meniscal tears: a popping sound between full knee flexion and 90° suggests a tear at the posterior edge of the meniscus; a popping sound when the knee is in greater extension suggests a tear in the middle or anterior part of the meniscus. 6.Apley grinding test The patient is in prone position, knee is flexed at 90°, the front of the thigh is fixed on the examination table, the foot and calf are lifted up, the joint is separated and rotational movements are made, the force of tension is on the ligament during rotation, if the ligament is torn, there is significant pain during the test. Thereafter, the knee joint in the same position, the foot and calf press down and rotate the joint, slow flexion and extension, when the meniscus is torn, there can be significant popping and pain in the knee joint gap. 7.Swing test: flex the knee about 30°, hold the calf with one hand, press the joint gap with one thumb, do inward and outward swinging action, if you feel the meniscus in and out or painful ringing is positive, suggesting that the meniscus is loose after injury. 8, hyperextension and hyperflexion pain: meniscus anterior or posterior horn injury in hyperextension or hyperflexion will produce extrusion pain. The sensitivity and specificity of all signs are not high, so the examiner needs to make a comprehensive judgment from history to physical examination, so patients should go to regular joint surgery for consultation if they have knee discomfort.