Spinal CanalSpinal StenosisInjections, EpiduralLidocaineAnesthetics, LocalSpinal CordSpinal Cord CompressionSpinal Cord InjuriesSemicircular CanalsCervical VertebraeLumbar VertebraeLaminectomyThoracic VertebraeEar CanalSpinal Cord DiseasesLigamentum FlavumSpinal DiseasesMyelographySpinal NeoplasmsDecompression, SurgicalSpinal FracturesRoot Canal PreparationSpinal FusionSpinal Cord NeoplasmsSpondylosisSpinal Nerve RootsEpidural SpaceCauda EquinaSpineLongitudinal LigamentsMagnetic Resonance ImagingRadiculopathyLumbosacral RegionDental Pulp CavityArnold-Chiari MalformationPolyradiculopathySacrumIntervertebral Disc DisplacementTomography, X-Ray ComputedRoot Canal IrrigantsDura MaterSpinal InjuriesInjections, SpinalInternal FixatorsRoot Canal Filling MaterialsSpondylolisthesisSpinal NervesSpinal OsteophytosisAnesthesia, SpinalAxisErysipeloidCervical AtlasTractionNasal CavityOssification of Posterior Longitudinal LigamentAchondroplasiaAnal CanalPeritoneal CavityTooth ApexQuadriplegiaIntervertebral DiscSubarachnoid SpaceNeck InjuriesNeurilemmomaRibsKyphosisVertebroplastySyringomyeliaScoliosisForeign-Body MigrationDislocationsBack PainNerve Compression SyndromesNeurosurgical ProceduresWounds, StabPeripheral Nervous System NeoplasmsAngiolipomaBone ScrewsMeningesEpidural NeoplasmsZygapophyseal JointCadaverMuscular Atrophy, SpinalTreatment OutcomeAtlanto-Axial JointMeningiomaSynovial CystBone Diseases, DevelopmentalDiskectomyLow Back PainSpinal Cord IschemiaFractures, CompressionOrthopedic Procedures