Knee swelling and pain after exercise, and even difficulty in extending and flexing the knee joint, some middle-aged and elderly people often have no cause of knee joint gap pain, people often mistakenly think that it is caused by arthritis. In fact, a large part of these cases is due to meniscus damage in the knee joint, caused by degeneration. Meniscus reduces wear and tear of the knee joint The knee joint is formed by the lower end of the femur, the upper end of the tibia, and the patella wrapped around the joint capsule at the front. The inner and outer femoral condyles at the lower end of the femur are hemispherical, and when the knee joint is active, it makes a compound action of rolling and sliding on the “platform” at the upper end of the tibia. In order to reduce friction and vibration, so that the pressure is evenly distributed, the human body will be in the two bones between the joint surface “plus” cartilage “spacer” — meniscus. Meniscus one side, located in the tibial plateau, shaped like a small bracket, by the joint capsule and the surrounding tendons, ligaments, fixed, with the knee movement can be forward and backward or inside and outside the direction of the slightest movement. Meniscus is easy to be injured The role of meniscus is very important, but also very easy to be injured. When the lower limb is weight-bearing, in the position of fixed foot and slightly flexed knee, the meniscus may be injured if the knee joint is suddenly internally rotated and extended or externally rotated and extended. In daily life, picking, lifting heavy objects; cycling in a hurry to get off the unsteady stand; intense soccer, basketball and other sports, athletes scramble, may occur meniscus acute injury. Long-term squatting or semi-squatting work, such as automobile mechanics, repeated squatting and standing up, meniscus wear and tear is serious, will also be injured. Knee pain in common diseases, such as rheumatoid, gout, joint free body, etc., can also lead to joint meniscus injury, aggravate joint pain symptoms. What are the manifestations of meniscus injury Meniscus injury in the acute stage, the knee joint space has obvious pain, swelling and effusion, joint flexion and extension activities are impaired. After the acute stage, the swelling and effusion can subside on its own, but there is still pain on the inner and outer side of the joint, especially when going up and down the stairs, going up and down the slope, squatting and standing up, running and jumping. The pain is mostly located in the joint space, and occasionally in the back of the joint, with the feeling of “hanging tight”. Meniscus injury is serious, can limp or flexion and extension dysfunction, some patients have “interlocking” phenomenon (i.e., ruptured part of the meniscus slipped into the joint between the joints, so that the joint activities of mechanical obstacles, hindering the joint extension and flexion activities) or in the knee flexion and extension of popping sound. How to confirm the diagnosis of meniscus injury MRI is a better imaging method of meniscus injury, the accuracy rate of up to 95%; arthroscopy diagnosis rate of 100%; photo X-ray front and side film, although it can not show the meniscus injury, but can rule out other bone and joint disorders. Principles of treatment for meniscus injury In acute stage, if there is obvious fluid or blood accumulation in the joint, the fluid should be extracted under strict aseptic operation; if there is “interlocking” in the joint, it can be lifted by maneuvering, but most of the time it needs surgical operation to lift the cause of interlocking. Actively exercise the quadriceps muscle to prevent muscle atrophy. In the chronic stage, if the non-surgical treatment is ineffective and the signs and symptoms are obvious, the damaged meniscus should be surgically removed in time to prevent the occurrence of traumatic arthritis. Patients with postoperative knee extension position with pressure bandage, the next day to walk on the ground, functional exercise, generally in the postoperative 2~3 months can return to normal function. Arthroscopy can treat meniscus injury arthroscopic surgery is currently the most advocated minimally invasive surgical methods for the treatment of knee injuries. It is minimally invasive, quick recovery, and can be used for the treatment of meniscus injury. Meniscus edge tears can be repaired with sutures, but the meniscus is usually partially excised, leaving the uninjured part intact. For early suspected meniscus injury, emergency arthroscopy is feasible, timely diagnosis and treatment of meniscus injury, in order to shorten the course of treatment, improve the therapeutic effect, and reduce the occurrence of injurious arthritis.