Yesterday, 14-year-old girl Li Mou encountered trouble, she played with her buddies at school squatting and then stand up, the left knee pain, seems to have something stuck, how can not straighten the left leg. Her mother was anxious to see that her child was too young to be in trouble, so she asked friends and relatives and was recommended to see Professor Liu Wenguang at the Department of Joint Surgery of the Second Hospital of Shandong University. In the outpatient clinic, Professor Liu carefully examined the child and then did an MRI examination, which clearly indicated meniscal damage. After the arthroscope was successfully placed, the huge tear of the left lateral meniscus from the posterior horn to the body could be clearly seen on the monitor. Considering the young age of the patient, if the traditional resection of the meniscus was taken, there would be many complications such as traumatic arthritis in the future, Prof. Liu decided to use the most advanced Fast-Fix 360 system from abroad and performed an arthroscopic total internal meniscal suture surgery, which was The surgery was completed successfully and the patient was discharged with satisfactory recovery. Arthroscopic total internal meniscal suturing is a complex and highly skilled operation, which requires strict training and a good knowledge of microscopic operation. The successful implementation of this surgery marked a new level of minimally invasive arthroscopic surgery in our orthopedic department.