Abstract
Objective To evaluate the biomechanical properties of a new device of internal fixation for femoral fractures, intrameduUary expanded self-locking nail (IESN). Methods Six pairs of cadaveric specimens of fresh adult femur were used to create transverse fracture models of middle femoral shaft. The specimens were randomized into 2 equal groups. Group 1 was fixated with IESN and Group 2 with conventional interlocking nails. A 1.5 cm bone gap was remained between fracture ends. All specimens were subjected to biomechanical tests for axial compression load, horizontal torsion and three-peint bending. The data were analyzed with statistic software SPSS13.0. Results The rigidities of Group 1 resisting rotation, axial displacement and bending were a little lower than those of Group 2, but there were no statistically significant differences between the two groups. Conclusion In treatment of femoral fractures, IESN is nearly as good as conventional interlocking nails but its application is simpler and free of conventional locking. Key words: Femoral fractures; Fracture fixation, internal; Intramedullary nailing; Biomechanics
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