Minimally invasive arthroscopic techniques are developing rapidly in the field of joint surgery, mainly for the knee joint, but also for shoulder, elbow, wrist, hip and ankle joint lesions. Our orthopaedic injury department carries out several hundred cases of knee arthroscopic surgery with remarkable efficacy, and also carries out arthroscopic treatment of each joint, which is introduced as follows: (a) Features and advantages: 1. Li Huiying of the First Affiliated Hospital of Henan College of Traditional Chinese Medicine Orthopaedic Injury Treatment Center 2. Fast recovery, you can get out of bed 1-2 days after surgery. 3.The intra-articular lesions can be treated and diagnosed clearly, and pathological biopsy can be done at the same time. 4.Wide range of indications, few complications, avoiding the shortcomings of traditional incisional surgery with large trauma and slow functional recovery. (B) Indications: Applicable to various lesions and injuries in the knee joint. 1. Meniscal injury 2. Joint inflammation: ① septic arthritis debridement and drainage ② tuberculous arthritis lesion cleanup ③ osteoarthritis cleanup and lavage ④ rheumatoid arthritis synovial cleanup 3. Synovial lesions: ① acute synovitis ② chronic synovitis ③ gouty synovitis ④ pigmented villous nodular synovitis ⑤ synovial chondromatosis ⑥ synovial embedding ⑦ synovial crease syndrome 4. repair and reconstruction of cruciate ligament injury 5. cartilage injury 6. intra-articular fracture 7. recurrent habitual dislocation of patella 8. free body removal 9. surgical release of knee adhesions 10. intra-articular soft tissue tumor removal 11. microscopic surgery for meniscal cysts 12. early examination and surgery for acute knee injury