Arthroscopic surgery for meniscus injuries: Arthroscopic techniques are widely used in the diagnosis and treatment of meniscus injuries. For many patients, swelling and pain in the knee joint, with no abnormality in the radiographs, may actually be a meniscus injury. In this case, arthroscopy is needed to realize accurate diagnosis of meniscus injury. In addition, in the treatment of meniscus injury, arthroscopic technology also plays a very important role. The arthroscopic treatment of meniscus injury includes arthroscopic partial meniscectomy, menuplasty and meniscal suture. Meniscus injury is a common disease of knee joint. Since the clinical application of arthroscopy, arthroscopic partial meniscectomy has been widely used abroad. Since the 1980s, arthroscopic partial meniscectomy has been reported in the Chinese literature. After partial meniscectomy, the meniscus function can be preserved to a certain extent, but it is certainly not as good as a complete meniscus. Even if a small portion of the meniscus is removed, it may be subjected to abnormal stresses that may lead to early degeneration of the meniscal cartilage. The meniscus should be preserved as much as possible, and the best way to heal the rupture is to suture the rupture. The progress of arthroscopic treatment of meniscus injury (a) change meniscus arthroscopic total excision to partial excision Long-term follow-up of patients with total meniscectomy, found that the incidence of degenerative disease after 17.5 years was as high as 57.5%. In order to avoid and minimize the negative consequences of total meniscectomy, total arthroscopic meniscectomy of injured meniscus was changed to partial meniscectomy. There are 2 different types of partial meniscectomy, one is segmental meniscectomy and the other is circumferential meniscectomy. Malcoln’s study showed that the stress on the contact surface between the femoral and tibial plateaus increased by 268% less with a ΒΌ meniscectomy compared with a total meniscectomy. Partial meniscectomy, due to more in line with the physiology of the knee joint, fewer postoperative complications, faster recovery, has become a widely adopted treatment of meniscal injuries, in a certain sense, can be replaced by total meniscectomy of a good surgical method. (Most scholars have concluded from the clinical and research results of arthroscopic partial meniscectomy that the meniscus should not be resected more than what is already broken or mechanically unstable; at the same time, a concave smooth meniscus rim and fibrous ring around the meniscus should be retained as much as possible, especially near the N-muscle pore of the lateral meniscus. Partial meniscectomy is better than total meniscectomy, and it is suggested that degenerated but not ruptured meniscus or even ruptured meniscus that does not affect the normal biomechanics of the joint should not be removed. (C) Repair the damaged meniscus as much as possible. After partial meniscectomy, although the meniscus function can be preserved, it is certainly not as good as a complete meniscus. Even if a small part of the meniscus is removed, the pressure on the meniscus will be abnormal and lead to early degeneration of the meniscal cartilage. The more of the meniscus that is preserved, the better, and the best way to heal the rupture is to suture the rupture. The marginal area of the meniscus is hemorrhagic, and there is also synovial tissue with tiny refractory vessels that enter the tibial and femoral surfaces of the meniscus through the synovium covering the anterior and posterior corners for 1 to 3 mm. The conditions for obtaining good healing of meniscal tears are acute injury to the meniscus, peripheral injury, and the introduction of a stable knee joint and a fibrin clot. It has been demonstrated that all parts of the meniscus have the potential to heal, and the introduction of exogenous fibrin clot has allowed the central avascular area of the meniscus, which was previously thought to be incapable of healing, to heal. When the tear occurs in the lateral 10% to 25% of the meniscus in the blood-supplied area, healing is possible with suturing and immobilization. Initially, only acute marginal tears were repaired, and recent reports have confirmed that even chronic tears can be repaired as long as there is no tear in the body of the meniscus. In humans, repair of tears other than marginal separations is not effective. Currently, meniscal repair is limited to the lateral 10% to 25% of the edge of the meniscus. Third, the method of meniscus suture meniscus suture usually use three basic techniques, namely, inside-out technique, outside-in technique and all-inside technique. (i) Inside-out suture technique (ii) Outside-in suture technique (iii) All-inside suture technique