We treated a 15-year-old female patient with fracture of the post-lateral femoral condyle and the bone shifted in front of the knee.Considering that the traditional surgical approach has the shortcomings of significant trauma and poor prognosis,we designed an arthroscopic procedure,which achieved satisfactory short-term efficacy,effectively reduced and fixed the fractures,avoided damage to vascular nerves,and maximally reduced the trauma caused by surgery itself.