The finite element method was used to compare and analyze the biomechanical stability of the Esbon thread suture fixation technique and the suture fixation of the lower patella fracture with the thread anchor nail. Select a CT image of the knee joint of a healthy adult volunteer and establishment of lower patella fracture model,and on this basis, establish a three-dimensional model of fracture fixation with the Esbon line and the line anchor.Analyze the stress distribution and maximum displacement of each fixed model under different knee bending angles.In the range of 0°-90°, as the knee flexion angle increases, the maximum stress and maximum displacement also increase.Under the same knee flexion angle, the anchor nail fixation has the highest stress level, and the Esbon fixation combined with seaming suture has the lowest stress level and the most uniform stress distribution.The displacement