Although arthroscopic applications have been clinically used for decades, however, due to the lack of foot and ankle specialists and the low regard of traditional orthopedic surgeons for arthroscopic treatment of foot and ankle joint diseases, as well as the technical limitations of foot and ankle arthroscopy, foot and ankle arthroscopic techniques have only been carried out among a small number of foot and ankle surgeons at home and abroad. In recent years, due to the development of domestic foot and ankle surgery and the training of foot and ankle surgeon specialists, coupled with the development of domestic sports medicine, foot and ankle arthroscopic techniques have been increasingly applied to the treatment of foot and ankle joint diseases, and have achieved encouraging efficacy, also providing an irreplaceable and effective tool for foot and ankle joint surgery. Foot and ankle arthroscopic techniques 1. Indications and contraindications With the help of standard 3.5mm or/and 2.7mm arthroscopes and corresponding finer diameter manipulation tools, we can examine and operate on almost all joint spaces of the foot and ankle joint as well as extra-articular synovial, plantar fascia, tarsal canal and other structures. Therefore, the indications for arthroscopy also extend to disorders of the bone and cartilage of the foot and ankle joint and the soft tissues inside and outside the joint. Specific synovial lesions such as rheumatoid arthritis, synovial cartilage osteochondral retention disease, choroidal nodular synovitis, crystalline synovitis and joint effusion/pus accumulation; chronic traumatic synovitis after joint injury, post-injury joint contamination, fibrous band formation, intra-articular pinching after ligament injury; osteochondral damage: chondritis, cartilage fracture, cartilage defect, bone redundancy formation, free body, bone geranium; post-injury Residual pain and dysfunction that cannot be diagnosed by conventional examination and for which conservative treatment is ineffective. The most valuable indications include the diagnosis of unexplained joint disorders, cartilage damage to the articular surfaces of the ankle, free bodies, synovial or soft tissue pinching, impingement, frozen ankle, and localized arthrofusion. The main contraindications include local systemic infection, loss of joint space and other systemic contraindications to surgery. 2. Arthroscopic techniques (1) Equipment and instrumentation requirements: In addition to standard arthroscopic equipment, finer diameter mirrors (2.7 mm) and working cannulae, traction devices, radiofrequency or laser devices can make arthroscopic operations more convenient and reach smaller joints in the foot. (2) Position and traction technique: The use of a dedicated bony traction brace can be a good way to open the joint space, but this method is not practical because it is an invasive segment. Most arthroscopists prefer to use the traction belt method, which can be used in a flat or lateral position as needed. Arthroscopic management and outcome of creative arthritis after ankle fracture Ankle fractures, especially after medial ankle fracture with posterior fracture, have residual partial dysfunction or pain in a significant proportion of cases after either conservative treatment or surgical internal fixation. In addition to fusion or arthroplasty in advanced 0A cases, early surgical intervention is particularly important. The use of a combined anterior and posterior approach provides a good scale of the tibiofibular joint surface and improves the patient’s foot and ankle scores through joint washout, free debris or bone clearing, articular surface shaping, and talar drilling. Case analysis showed better outcomes in cases with damage to the tibial or talar cartilage surfaces alone, while the corresponding 4th degree damage had limited surgical efficacy. Postoperative rehabilitation After routine arthroscopic exploration and cleaning, the patient could walk with partial weight-bearing on the ground on the second day, change the medication on the third day, replace the cotton splint for fixation with an elastic bandage, and start foot and ankle flexion and extension exercises. One to two weeks after surgery, the patient could resume normal weight-bearing walking, continue flexion and extension exercises, and start muscle strength training. One to one and a half months after surgery, the mobility of the ankle joint can be normalized and sports can be resumed. If microfracture surgery, ligament reconstruction, joint fusion, total synovectomy, etc. are performed, the rehabilitation time should be extended. In recent years, in the field of ankle and orthopedic sports medicine, the diagnosis and treatment of traumatic instability and post-injury residual dysfunction of the ankle joint due to foot and ankle injury has become a hot research topic. The use of arthroscopic techniques for the assessment of ligament and cartilage damage in the ankle joint and arthroscopic-assisted techniques for the repair and reconstruction of ligaments and cartilage are the main research directions of ankle arthroscopic techniques at present. To date, foot and ankle arthroscopy is still a developing technique, but it will undoubtedly become an effective and indispensable tool in the field of foot and ankle surgery. Although foot and ankle arthroscopy is not yet popular in China, we have reasons to believe from the development of knee arthroscopy and the popularity of the technology in China that it will definitely gain great development in China in the near future.