Most meniscus injuries in middle-aged people occur in the posterior horn of the medial meniscus, and the tear is mostly horizontal. In such patients, early treatment can preserve the posterior portion of the horizontal meniscus tear without partial meniscectomy, which means that the meniscus can still be roughly preserved after surgery. As shown in the figure, the posterior horn of the medial meniscus is hairy, and the probe hook goes in and is consistent with a horizontal tear, so arthroscopic radiofrequency plication of the posterior horn of the medial meniscus is performed. There are several advantages of using radiofrequency, one is that it is convenient to stop bleeding, no need to put drainage tube after surgery, no or little bleeding; the second is that using radiofrequency can do a good shape of meniscus, local tightening tissue, which is conducive to improving the treatment effect after meniscus surgery. This is what it looks like after meniscus shaping. Comparing with the picture of the previous injury, you can see that the rough edges are removed, the poorly shaped half of the tear is removed, and the well shaped half is preserved, and from the overall view, the meniscus shape is still there. Such patients have a quicker postoperative recovery, do not need to have a drain placed, and are walking on the ground the day after surgery. In patients who have been on the shelf for a long time, the meniscus will wear away the upper and lower articular surfaces, causing wear to the cartilage surfaces of the femur and tibia, or thigh and calf bones, and if the wear is deep, there will be pain after surgery, and the arthroscopic surgery will not be as effective. I usually tell such patients that the prognosis is not good, and I do not take such patients because they are not suitable for treatment in my field. Only conservative treatment or joint replacement surgery can be considered later.