| Aim: In view of biomechanics of locking compression plate andintramedullary nailing for femoral shaft fractures were analyzed to providebiomechanical basis for the clinical treatment of femoral shaft fracturesequipment selection.Methods:In this study,18normal people take the bodies of the femurspecimens were randomly divided into three groups, A group of normal controlgroup, Group B femoral shaft fracture model LCP locking plate fixation of sixspecimens, C group model of femoral shaft fractures marrow screw fixation ofsix specimens. After the two ends of the femur to dilute fixed denture powderembedding, B, C shares, respectively, two specimens simulation backbonetransverse fractures. Each group were respectively sequentially inputted to thegeometry of a computer controlled machine. Presetting femur specimensprocessed in accordance with references[4-9]the method of operating, wereadded to each femur specimens-unloading same stress15times. First pre-tunetreatment, after treatment of femoral specimens can experiment.①Eachspecimen is placed respectively on the contact head universal testing machinetable, the upper portion of the sample testing machine, for the specimensmoisture, the test specimen of continuous spraying saline PH value of7.4. Thetest machine with adjustable ambient temperature boxes, range-35℃-250℃,to simulate the human body temperature, the experiment (37.0±0.5)℃carried out at a temperature. Respectively,200N,400N,600N,800N,1000Nload of A, B, C three groups femur specimens subjected to stress loading rate of5mm/min, corresponding to the measured displacement data.②sample size,sample pre-adjustment processing, the experimental temperature, the sampleswere moisturizing method and attached to the force axis of each specimen work surface tester, universal testing machine side pointing the same compressiontest specimens femoral biasing point, the outer diameter of each sample pointfrom the edge to the biasing40mm. Respectively20N,40N,60N,80N,100Nload to the A, B, C three samples subjected to stress femoral loading speed of1mm/min, corresponding to the measured displacement data.③on the samplesize, sample pre-set treatment, experimental temperature, moisture sampleswere the same experimental method and compression force axis of eachspecimen will be installed in the test machine work table, electronic universaltesting machine rear femur specimens urging points, each point of the specimenat the outer edge to the urging from40mm. Respectively20N,40kN,60N,80N,100N load to the A, B, C three samples subjected to stress femoral loadingspeed of1mm/min, corresponding to the measured displacement data.Results: The results of each group femur compression show that themaximum load500N role in the group B，group C，the maximum displacementis greater than the A group，the difference was significant (P <0.05). Group Cmaximum displacement of less than group B，the difference was significant (P<0.05). Femoral flexion results in each group showed that the effect of themaximum load100N，B，C maximum bit less than the normal control groupwere significantly (P <0.05)，group B is greater than the maximum displacementwith intramedullary nail fixation group，the difference was significant (P <0.05).After each group femur extension results show that the effect of the maximumload100N，Group B，Group C maximum displacement than the normal controlgroup，the difference was significant (P <0.05)，group B is greater than themaximum displacement of group C，the difference was significant (P <0.05).Conclusions:Vitro interlocking intramedullary nailing of femoral shaftfractures (type DDSVI straight) fixation achieved good results，which isdesigned to meet the principles of biomechanics. Femoral shaft fractures in vitrolocking compression plate fixation also has some effect，the lock design is alsoin line with the principles of biomechanics. |
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