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- W2349408500 abstract "Objective:To evaluate the biomechanical effect of a self-designed iliac bone plate on the subsidence of iliac screw after fatigue loading.Method:Lumbo-pelvic specimens from 6 adult fresh cadavers were used in this study,their mean bone mineral densities(BMD) of L1-L4 were measured by using dual-energy radiograph absorptiometry.The iliac bone plate was randomly placed at the iliac screw entry point of one-side ilium(group A),while the other side without iliac bone plate served as the control(group B).Then,the iliac screws with 70mm length and 7.5mm diameter were inserted into the ilium bilaterally.On a MTS testing machine,a dynamic compressive loading of 100-400N was added to the screw head for 20000 cycles.The screw subsidence displacements following each 5000 cyclic loadings were measured and compared between two groups.Result:The average BMD value of 6 specimens was 0.89±0.06g/cm2,ranged from 0.78g/cm2 to 1.06g/cm2.All the screws passed the 20000 cyclic loadings smoothly.At the time-points of the 5000th,10000th,15000th,and 20000th cyclic loadings,the subsidence displacements of iliac screw in group A were 0.28mm,0.36mm,0.48mm and 0.66mm respectively;while those in group B were 0.34mm,0.69mm,0.88mm and 1.07mm respectively.After the first 5000 cyclic loadings,no significance with respect to subsidence displacement was detected between two groups(P0.05).However,at the 10000th,15000th and 20000th cycles,significant difference was noted between two groups(P0.05).After the 20000 cyclic loadings,no screw in group A and 5 screws in group B were found loosen under radiograph.Conclusion:The iliac bone plate can effectively resist the subsidence of iliac screw following fatigue loading and protect iliac screw against loosening." @default.
- W2349408500 created "2016-06-24" @default.
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- W2349408500 date "2011-01-01" @default.
- W2349408500 modified "2023-09-23" @default.
- W2349408500 title "Effect of an iliac bone plate on the subsidence of iliac screw after fatigue loading" @default.
- W2349408500 hasPublicationYear "2011" @default.
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