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Title of Journal: Eur Spine J

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Abbravation: European Spine Journal

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Springer-Verlag

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10.1016/0254-0584(88)90045-4

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1432-0932

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Compliance of the L5S1 spinal unit a comparative

Authors: E A Charriere T Beutler M Caride P Mordasini T E Orr P K Zysset
Publish Date: 2005/04/30
Volume: 15, Issue: 1, Pages: 74-81
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Abstract

A comparison between an unconstrained and a partially constrained system for in vitro biomechanical testing of the L5S1 spinal unit was conducted The objective was to compare the compliance and the coupling of the L5S1 unit measured with an unconstrained and a partially constrained test for the three major physiological motions of the human spine Very few studies have compared unconstrained and partially constrained testing systems using the same cadaveric functional spinal units FSUs Seven human L5S1 units were therefore tested on both a pneumatic unconstrained and a servohydraulic partially constrained system Each FSU was tested along three motions flexionextension FE lateral bending LB and axial rotation AR The obtained kinematics on both systems is not equivalent except for the FE case where both motions are similar The directions of coupled motions were similar for both tests but their magnitudes were smaller in the partially constrained configuration The use of a partially constrained system to characterize LB and AR of the lumbosacral FSU decreased significantly the measured stiffness of the segment The unconstrained system is today’s “gold standard” for the characterization of FSUs The selected partially constrained method seems also to be an appropriate way to characterize FSUs for specific applications Care should be taken using the latter method when the coupled motions are important

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