• 1. Department of Orthopedics, Chinese Medicine Hospital Affiliated to Luzhou Medical College, Luzhou Sichuan, 646000, P. R. China;
  • 2. Department of Orthopedics, the Affiliated Hospital of Luzhou Medical College;
LUXiaobo, Email: luxiaobo1963@126.com
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Objective To explore the mechanical stability of the three-dimensional (3-D) external fixator for osteoporotic fracture so as to provide the biomechanical basis for clinical application. Methods Forty-five fresh frozen adult tibial specimens were selected to rapidly prepare the extracorporal tibia osteoporotic fracture models, and were randomly divided into 3 groups (n=15). Fractures were fixed with 3-D external fixators (3-D external fixators group), intramedullary nails (intramedullary nail group), and plate (plate group) respectively. Five specimens randomly from each group were used to do axial compression test, three-point bending test, and torsion test with microcomputer control electronic universal testing machine, then the mechanical parameters were calculated. Results In the axial compression test, the displacement of 3-D external fixator group and intramedullary nail group were shorter than plate group, showing significant differences (P<0.05); but no significant difference was found between 3-D external fixator group and intramedullary nail group (P>0.05). In the three-point bending test and torsion test, the deflection and the torsional angle of 3-D external fixator group and intramedullary nail group were smaller than plate group, showing significant differences (P<0.05); but no significant difference was found between 3-D external fixator group and intramedullary nail group (P>0.05). Conclusion The 3-D external fixator can fix fracture three-dimensionally from multiple plane and it can offer strong fixing. It is biomechanically demonstrated to be suitable for osteoporotic fracture.

Citation: LIUZongchao, TIANZegao, JIANGYan, WANGZhenlong, LIUYong, LUXiaobo. BIOMECHANICS STUDY ON THREE-DIMENSIONAL EXTERNAL FIXATOR FOR OSTEOPOROTIC FRACTURE. Chinese Journal of Reparative and Reconstructive Surgery, 2015, 29(2): 145-148. doi: 10.7507/1002-1892.20150031 Copy

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