Movements of the lumbo-sacral nerve roots in the spinal canal induced by straight leg raising test: an anatomical study

摘要

Purpose The pain involved in the herniated discs could be generated by some mobility of the nerve roots during straight leg raising (SLR). SLR produces some movement of nerves, but the magnitude of this displacement needs to be thorough, that is why we have investigated lumbo-sacral nerve root displacement in the spinal canal during the passive straight leg raise (SLR). Methods Fourteen cadavers underwent laminectomy to mark the nerve roots of L2–S1 with lead balls. X-rays were taken during different movements imposed on the body: bilateral hip extension, left SLR then right and bilateral SLR. By superimposing these images two by two, the displacement of the nerve roots is quantified numerically during the various SLR maneuvers with respect to the reference position corresponding to the bilateral hip extension. Results The median range of the different nerve root movements ranged from 0.10 to 0.51?cm ( p ?