Biomechanical Evaluation Of Different Fixation Methods In Type C1 Fractures Of Distal Femur

Objective:The purpose of this experiment is to compare the biomechanical properties of the Distal Femoral Locking Plate, Distal Femoral Anatomic Plate and unilateral external fixation in the treatment of type C1 distal femur fractures, I hope can offer some reference for clinical application value.Method:1. Preparation of sample and grouping Remove 15 cases of left femoral specimens from the selected 15 cadavers.15 femoral specimens were numbered and divided randomly into the Distal Femoral Locking Plate(DF-LP group),Distal Femoral Anatomic Plate(DF-AP group), unilateral external fixation(UEF group),5 specimens in each group.2. Preparation of the experimental model Cut on the distal femur based on the design of type C1 distal femur fractures. Then fixed the femoral specimens with the Distal Femoral Locking Plate, Distal Femoral Anatomic Plate and unilateral external fixation to make the femoral fracture model.3. Experiment method The fracture models were firmly fixed on the biomechanical device and subjected to axial compression test each other. Fixation fail criteria:the displacement of fracture reach to 2mm. The experimental data were generated by the biomechanical device and saved to the computer. Then the data was analyzed and recorded via corresponding software. The data include femoral axial load-displacement, axial stiffness, failure load.4.Statistical Analysis Applied SPSS 17.0 software to analyze all the data of three experimental group.Results:DF-LP fixation set of axial stiffness, failure loads are the largest, compared with DF-AP fixation group and UEF fixation group was significantly different each other; DF-AP fixation group compared with the UEF fixation, and the difference was significant. UEF fixation set of axial stiffness, failure loads are the smallest. Under the load strength of 200N,400N,600N, the displacement of the DF-LP group were minimal, while the displacement of the UEF group was the largest. The differences between each other of 3 fixation groups were significant.Conclusion:This study demonstrated that under simulated normal physiological conditions, for type C1 distal femur fractures, Distal Femoral Locking Plate anatomic axial stiffness and resistance to axial compression capabilities are largest, followed by the Distal Femoral Anatomic Plate,and the external fixator group are amallest.