Biomechanical Test And Study Of Dynamic Load External Fixation (DLEF) In The Fixture Of Intertrochanteric Fracture

Objective Designed and made sliding load external fixator (SLEF)according to unilateral angulated external fixator and dynamic hip screw,and Biomechanical evaluation for it.Methods Five pairs fresher adult femur specimens wereprepared, after the model of A1.1(A0 classification) fracture wasestablished. For the experimental group was fixed with sliding loadexternal fixation (SLEF),for the balance group was fixed with traditionalone arm external fixation, We conduct it on electronic almightyexperimental plane. Experimental tests are divided into the stressdistribution in the edge of fracture, walking model experiment. Graduallyfrom 200N to 1200N load in the test.Results 1. The stress distribution in the edge of fracture: Theouter side four points are pulled stress,but the experimental groupincluding tension side are all pressure stress 2. Walking modelexperiment: In a walking cycle,the emergence of a peak at balance group,and three test contingency peaks and two minimum at the experimental group,and this is conducive to the healing of fractures.Conclusion The performance of the biological mechanics aboutsliding load external fixator (SLEF) are superior to the ordinary fixed devices, lt has been provided rigid fixation and avoids or reduces thecomplications such as coax vara, has the advantage of promoting fracturehealing.