Recently, the Department of Orthopaedic Surgery of our hospital, with the support of Department Director Guangpeng District and Xiao Jun, and with Dr. Li Bei in charge, successfully completed the first knee arthroscopic repositioning and fixation of anterior cruciate ligament inferior stop avulsion fracture in Gaoming District, which marked a new breakthrough in the diagnosis and treatment of sports trauma diseases in our joint surgery department. The patient was admitted to the hospital with painful swelling and limited extension after knee valgus injury, and the anterior stability of the knee joint was poor and extension was significantly limited. After admission, Dr. Li Bei explained the patient’s condition to his family and recommended minimally invasive knee arthroscopy to minimize trauma and improve joint function. Hearing that such a good method was available, the patient and his family happily requested the surgery as soon as possible. After thorough preoperative planning, on the morning of October 11, with the cooperation of the anesthesiology department and the operating room, Dr. Li Bei successfully repositioned and fixed the inferior stop of the ACL of the affected knee using arthroscopy, and the limitation of extension of the affected knee was completely corrected under the direct view of the arthroscope. The patient’s family was quite satisfied with the outcome of the surgery. It is understood that although knee arthroscopy is now well established in China, full microscopic repositioning and fixation of an ACL inferior stop avulsion fracture is still recognized as a difficult procedure in arthroscopic surgery due to its very limited operating space, high suture management requirements and operational difficulties. The advantage of this procedure is that the original end structure of the ACL attached to the cartilage is preserved intact, its proper tension is completely restored, and the limitation of knee extension can be corrected under direct arthroscopic view, avoiding the great impact on life caused by the limitation of extension in the future. One of the key development directions of our Orthopaedic Department is arthroscopic minimally invasive technology for the treatment of orthopaedic joint sports trauma. Last year, Dr. Li Bei was sent to Beijing University Sports Medicine Institute and Beijing Jishuitan Hospital to study the latest arthroscopic techniques and rehabilitation concepts with the top sports medicine experts in China. This time, he applied the latest arthroscopic minimally invasive surgery technology to orthopedic sports trauma patients, filling the gap in this technology field in our hospital, marking a new level of minimally invasive treatment in our orthopedic department, and this technology will also benefit more orthopedic joint trauma and disease patients in Gaoming District.