Spinal StenosisInjections, EpiduralEpendymaSpinal CanalSpinal CordSyringomyeliaHaversian SystemLidocaineAnesthetics, LocalSpinal Cord InjuriesLumbar VertebraeDecompression, SurgicalLaminectomySpondylolisthesisCarotid StenosisSemicircular CanalsAortic Valve StenosisRadiculopathyLigamentum FlavumSpinal FusionEar CanalLumbosacral RegionIntervertebral Disc DisplacementCoronary StenosisSpinal DiseasesSciaticaTracheal StenosisSpinal Nerve RootsSpinal Cord CompressionPolyradiculopathyMyelographyTreatment OutcomeLow Back PainImmunohistochemistryRoot Canal PreparationSpondylosisIntermittent ClaudicationPain MeasurementPyloric StenosisDisability EvaluationConstriction, PathologicMitral Valve StenosisCervical VertebraeBack PainPulmonary Valve StenosisMagnetic Resonance ImagingInjections, SpinalSteroidsOrthopedic ProceduresSacrumFollow-Up StudiesNeurosurgical ProceduresFailed Back Surgery SyndromeEpidural SpaceProspective StudiesCauda EquinaSeverity of Illness IndexProstheses and ImplantsRoot Canal IrrigantsSpineDental Pulp Cavity