Spinal StenosisInjections, EpiduralEpendymaSpinal CanalSpinal CordSyringomyeliaHaversian SystemLidocaineAnesthetics, LocalSpinal Cord InjuriesLumbar VertebraeDecompression, SurgicalPrevalenceLaminectomySpondylolisthesisCarotid StenosisSemicircular CanalsAortic Valve StenosisRadiculopathyLigamentum FlavumSpinal FusionEar CanalLumbosacral RegionCoronary StenosisIntervertebral Disc DisplacementSpinal DiseasesSciaticaTracheal StenosisSpinal Nerve RootsSpinal Cord CompressionMyelographyPolyradiculopathyLow Back PainImmunohistochemistryRoot Canal PreparationTreatment OutcomeSpondylosisIntermittent ClaudicationPain MeasurementPyloric StenosisDisability EvaluationMitral Valve StenosisConstriction, PathologicCervical VertebraeBack PainPulmonary Valve StenosisInjections, SpinalMagnetic Resonance ImagingSteroidsOrthopedic ProceduresSacrumNeurosurgical ProceduresFailed Back Surgery SyndromeFollow-Up StudiesProspective StudiesEpidural SpaceCauda EquinaRetrospective StudiesRoot Canal IrrigantsProstheses and ImplantsSpineDental Pulp Cavity