Spinal StenosisInjections, EpiduralEpendymaSpinal CordSpinal CanalSyringomyeliaHaversian SystemLidocaineAnesthetics, LocalSpinal Cord InjuriesLumbar VertebraeDecompression, SurgicalLaminectomySpondylolisthesisCarotid StenosisSemicircular CanalsAortic Valve StenosisRadiculopathyLigamentum FlavumSpinal FusionEar CanalSpinal Nerve RootsIntervertebral Disc DisplacementLumbosacral RegionCoronary StenosisSpinal DiseasesSciaticaSciatic NerveTracheal StenosisSpinal Cord CompressionImmunohistochemistryMyelographyPolyradiculopathyRoot Canal PreparationLow Back PainSpinal NervesSpondylosisTreatment OutcomePain MeasurementIntermittent ClaudicationPeripheral NervesPyloric StenosisCervical VertebraeMitral Valve StenosisDisability EvaluationConstriction, PathologicPulmonary Valve StenosisInjections, SpinalBack PainNerve FibersMagnetic Resonance ImagingOptic NerveNerve Compression SyndromesSteroidsNeurosurgical ProceduresSacrumOrthopedic ProceduresFailed Back Surgery SyndromeEpidural SpaceNerve BlockCauda EquinaNerve RegenerationProstheses and ImplantsRoot Canal IrrigantsFollow-Up StudiesSpineDental Pulp Cavity