Abstract: Objective To explore the biomechanics of the fractures fixation by external locking plate and external fixator, and to provide a theoretical basis for clinical application of external locking plate in fracture fixation. Methods Bovine bones of different lengths were chosen as the artificial fracture specimens and external locking plate fixation and external fixation were adopted respectively to observe the axial compression, torsion and bending changes under different loads by using a variety of testing methods. Results The differences of the axial compressive load values between the two groups under 100, 200, 300, 400, 500, 600 and 700 N were statistically significant （P〈0.05）, with the larger of the load, the greater of the gap of axial compressive values. The differences of torsion angles between the two groups under 4, 6, 8, 10, 12, 14 N.cm were statistically significant （P〈0.05）, and the greater of the load, the bigger of the gap of torsion angles. The differences of bending load displacement values between the two groups under 50, 100, 150, 200, 250, 300 N were statistically significant （P〈0.05）, and with the greater of the load, the larger of the gap in bending displacement values. Conclusion The biomechanics of external locking plate fixation is better than the external fixator, and it can be clinically used as external fixators, providing a new method for the clinical treatment of open fractures.

Key words: Locking plate, External fixator, Fracture, Biomechanics