The Biomechanical Evaluation And Design Of Distal Linkage Vane Intramedullary Self-locking Nail For Femur Fractures

The author designed and produced a new type of long tubularbone marrow fixation devices-remote linkage leaves self-lockingintramedullary nail, and the distal self-locking avoided thedifficulties in locking. This paper described the design principles,and made a preliminary biomechanical properties test of this newfemoral intramedullary nail which is produced from the samemanufacturers of traditional interlocking the intramedullary nail tounderstand the mechanical properties of the new intramedullary nail,and lay the foundation for further development and clinicalapplication. In this paper, We take an evaluation of this newintramedullary nail from two different aspects.First: The design and mechanical test of the remote linkage leaves self-locking intramedullary nail.Objective: To develop a remote linkage leaves self-lockingintramedullary nail, characterized by the same size and shape withtraditional intramedullary nail, a driving device of designing twopairs of linkage leaves at the nail distal tube and design linkageleaves in the nail tube. Product the femur likely nails and to test andevaluate its mechanical properties. Methods:16pairs of fresh youngadult male femur bone specimens were divided into2groups, thelength of4cm, diameter (inside diameter)11-14mm, locking andfixing the bone segment separately with remote linkage leaves fromthe intramedullary nail and domestic traditional stainless steelinterlocking intramedullary nail, then have a mechanical tests on thetwo compounds of bone segments-intramedullary nail complexwith MTS mechanical testing machine. The experimental datas wasanalyzed by SPSS17.0statistical software. Results: The self-lockingintramedullary nail for remote linkage leaves have an anti-shortening,a small torsion capacity than the traditional interlockingintramedullar, but there is no significant statistically differences; theresistance to bending stiffness is approximately with the interlocking intramedullary nail. Conclusion: The remote linkage bladesintramedullary nail has a strong resistance to compression,anti-rotation performance, excellent bending performance to achievethe requirements of the femur biological fixing, there is a gooddevelopment and clinical applications.Second: a biomechanical studies of the femur based remote linkageleaves intramedullary nail and the whole nail in the treatment offemur fractures.Objective: To test the biomechanical properties of remotelinkage intramedullary nail fixation and intramedullary nail fixationafter femoral shaft fractures blade, to understanding thebiomechanical property of intramedullary nailing for femoralfractures. Methods: six young male body to take the bilateralcomplete femur, the transverse fracture were made in the middle,and then use the remote linkage leaves self-locking intramedullarynail and domestic conventional interlocking intramedullary fixing.To made a mechanical test of the femur-intramedullary complex, toanalyze the experimental results with SPSS17.0statistical software.Results: There is no significant differences between remote linkage leaves self-locking intramedullary nail and domestic interlockingintramedullary nail at the three-point bending and torsionexperiments, poor resistance to axial load than domestic interlockingintramedullary nail, but meet the physically non-weight-bearingstatus under the biological fixation. Conclusions: The femur-typeremote linkage blade intramedullary nail has a better mechanicalstability, has certain advantages in the treatment of femur fractures.