Abstract:

BACKGROUND: The effect of the bridge combined fixation system for the fixation of bone fracture compared with locking plate system needs to be confirmed by experiment.
OBJECTIVE: To compare the biomechanical properties of bridge combined fixation system and locking plate-screw system for the fixation of femoral fractures.
METHODS: We used the finite element analysis method to analyze biomechanical characters of the femoral fractures fixed with the locking plate-screw system and bridge combined fixation system, such as the stress distribution and the strain characteristics of bone and fixation.
RESULTS AND CONCLUSION: The stress on the locking plate screw when climbing stairs was increased for 48.6% compared with walking, the stress was 480 MPa and the maximum stress was on the middle of the locking plate-screw screws. The maximum stress on the middle of the bridge system when climbing was 34.1% larger than that when walking, the maximum stress was 373.9 MPa and occurred near the distal connection rod. The stress on the fracture area of bridge combined fixation system was smaller than that of locking plate system. In summary, as a new kind of bone fracture internal fixation, the biomechanical property of the bridge combined fixation system is significantly higher than that of the locking plate system with the advantages of better fixation stability and beneficial to bone growth.