Objective To study the stability of flexible fixation for ligamentous lisfranc injuries, and to provide theoretical basis for clinical correct choice. Methods Three-dimensional CT images of feet of healthy male volunteers were selected. Four three-dimensional models of feet were established by Mimics 16.0, Geomagic and Cero 4.0, respectively, including normal model, Liafranc ligament injury model, flexible fixation model and hollow nail fixation model. The total displacement, transverse displacement and longitudinal displacement between C1 and M2 under axial load are calculated. Results (1) The total displacement of the hollow nail fixation model was significantly smaller than that of the flexible fixation model and the normal model (P < 0.01). (2) the total displacement of the e flexible fixation model was similar to that of the normal model in the neutral position. The difference was not statistically significant (P>0.05), but at the plantar flexion 30 degree, the total displacement of the flexible fixation model model was larger than that of the normal model, and the difference was statistically significant (P<0.05). (3) The longitudinal displacement of the hollow nail fixation model was significantly smaller than that of the flexible fixation model and the normal model (P < 0.01). (4) The lateral displacement of the flexible fixation model was similar to that of the normal model in neutral position, there was no significant difference (P > 0.05). Conclusion Flexible fixation for ligamentous lisfranc injuries could provide a stable mechanical environment for the healing of ligament and joint capsule. However, the integrity of C2 joint and M2 proximal end should be paid attention to in clinical application, patients with intact second metatarsal and medial cuneiform bone should be selected clinically.