In order to evaluate the results of arthroscopic surgery for the treatment of knee septic arthritis, we conducted a prospective and retrospective cross-sectional study of 38 patients diagnosed and treated for knee osteoarthritis during the period from May 2019 to April 2021 at the Department of Orthopedic and Spine Trauma - Bach Mai Hospital, the shortest follow-up time was 6 months and the longest was 23 months.