Inflammation of the knee joint is a common condition in orthopedics. Many modern people entering their dotage continue to participate in more strenuous sports and have high functional expectations of the knee joint. Among them, the typical lesion in men tends to be traumatic knee osteoarthritis secondary to meniscal or ligament injuries, while in women, especially those who are heavier, it tends to be osteoarthritis caused by degenerative joint degeneration. Conservative treatment of this disease includes the use of NSAIDs, glucocorticoid injections, intra-articular vitronectomy, nutritional support, local physical therapy, and brace immobilization. Non-weight-bearing joint activities such as swimming and cycling are recommended, with stationary cycling being the most standard. Previous studies have shown that the results of arthroscopic debridement for mild to severe knee osteoarthritis do not differ significantly from conservative treatment. However, arthroscopic surgery is appropriate in the presence of joint free bodies, meniscal damage, cartilage flap avulsions, and impingement of hyperplastic bone. Arthroscopic drilling and decompression to create microfractures is used to treat mild to moderate arthritis. The indications are as follows: mild pain in daily life; failure of conservative treatment; mild to moderate radiological improvement; no instability; inversion deformity of no more than 5° in the weight-bearing position; and a defect of full cartilage. The key points of surgery are: the cleaned cartilage edge must be perpendicular to the bone surface, and the hole must reach the subchondral bone, about 3-4 mm deep, and 2-3 mm away from the medullary cavity to induce osteogenesis. Early postoperative exercise and gradual weight-bearing of the affected limb within 3 months. 1-2 years follow-up for better function. Immunohistochemical results showed that 44% of the new cartilage component was type II collagen. Patients with focal, severe patellofemoral joint rigidity presented with severe anterior knee pain and great difficulty sitting and rising. Radiological manifestations include peripatellar joint surface osteophytes and patellar enlargement. For older, less active patients, patellofemoral surface replacement or total knee arthroplasty is recommended. However, the authors believe that an arthroscopic partial resection of the lateral patellofemoral articular surface is less traumatic to the joint and provides a more satisfactory outcome. The patient experienced significant pain relief and improvement in sitting and standing movements. Parsons` third intercondylar spine (TITP) is a bony growth of the anterior cruciate ligament anterior to the tibial stop. Patients with this condition experience anterior knee pain and limited extension, and the osteochondral growth can be seen on x-ray. The cause of the symptoms is impingement of the osteochondral fossa with the intercondylar fossa, so arthroscopic removal of the osteochondral fossa resolves the pain and deformity in the vast majority of patients. However, arthroscopic surgery is not recommended for patients with knee flexion deformity greater than 15°, which is often accompanied by contracture of the posterior aspect of the joint capsule. Arthroscopic surgery is becoming increasingly important in the treatment of arthritis of the knee. Arthroscopic joint cleaning is more popular among patients because it is very minimally invasive and causes little damage to the normal structures of the joint.