Objective To conduct a comparative study on the biomechanical performance of using sutures for repairing inferior pole patellar fractures. Methods Compared to the normal patellar structure ( Group A), four repair methods, namely, ‘ Krackow’ suture ( Group B), “ Kessler” fixation ( Group C), ‘ 8 - figure’ mesh method (Group D), and modified suture bridge ( Group E) were adopted. The static stiffness and dynamic stability of inferior pole patellar fractures fixed by each repair method were measured at 30°, 60°, and 90° knee flexion. Results The stiffness at all flexion angles in Group E was closer to that in Group A, compared to other repair groups, followed by Group B, then Group D, and finally Group C. After the first cycle, at 30° knee flexion, Group C showed the greatest displacement, while Groups B and E had slightly larger displacements than the Group A, and the displacement of Group D was smaller than that of Group A. At 60° and 90° knee flexion, the displacement in all repair groups was smaller than that of Group A. After 200 cycles in the subsequent three cycles, displacement changes in all repair groups were smaller than those in Group A. Conclusions All repair methods were effective. In terms of biomechanical fixation performance, the modified suture bridge was superior to the ‘Krackow’ suture and ‘8-figure’ mesh, with Kessler fixation being the least effective. However, factors such as the injury severity, incision location, and surgical time should be comprehensively considered in actual clinical use, and it is recommended that the repair method should be selected in the following order: E, B, D, and C.