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《Chinese Journal of Clinical Anatomy》 2010-01
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Biomechanical efficiency of single-level unilateral pedicle screw fixation on the instrumented lumbar segment and adjacent segments

DONG Jian-wen,QIU Yi-yan,ZHAO Wei-dong,et al.Department of Spine Surgery,the 3rd Affiliated Hospital of Sun Yet-sen University,GuangZhou,510630,China  
Objective To evaluate the biomechanical efficiency of single-level unilateral pedicle screw fixation on the instrumented lumbar segment and adjacent segments.Methods Six fresh-frozen human cadaveric lumbar spines of simulated instability at L4~5 were conducted to a serial of biomechanical tests including flexion,extension,lateral bending and axial rotation.The range of motion in each specimen was tested in sequence according to such four groups:intact in group A,L4-5 segmental instability in group B,unilateral pedicle screw fixation combined with single cage in group C and bilateral pedicle screw fixation combined with single cage in group D.Results Apart from the ROM of left lateral bending,there was no significant difference of ROM at L4-5 between group C and group D(P0.05).Apart from the ROM of left and right lateral bending,there was no significant difference of ROM at L3-4 and L5-S1 between group C and group D(P0.05).Conclusions All tested single-level unilateral pedicle screw fixation can achieve similar initial biomechanical stability and cause less lateral bending motion at adjacent segments in comparison with bilateral pedicle screw fixation.
【Fund】: 广东省科技计划项目(2008B030301129)
【CateGory Index】: R687.3;R318.01
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