Injections, EpiduralSpinal CordFluoroscopySpinal Cord InjuriesAnesthetics, LocalAnesthesia, EpiduralLumbosacral RegionRadiculopathySteroidsSpinal StenosisEpidural SpaceInjections, SpinalFailed Back Surgery SyndromeLow Back PainChronic PainLidocaineBack PainIntervertebral Disc DisplacementSpinal Nerve RootsBetamethasoneInjectionsCervical VertebraeNeck PainPain ManagementNerve BlockLumbar VertebraeAnalgesia, EpiduralSpinal NervesSpinal Cord DiseasesAnesthesia, SpinalBupivacainePain MeasurementDouble-Blind MethodSpinal Cord NeoplasmsSpinal CanalSpineSciaticaSpinal DiseasesSpinal Cord CompressionSpinal NeoplasmsTriamcinoloneAdrenal Cortex HormonesChronic DiseaseSpinal FusionPseudarthrosisDiscitisThiamylalAnalgesicsIntervertebral DiscAnalgesiaSpinal InjuriesMuscular Atrophy, SpinalAnalgesics, OpioidAnti-Inflammatory AgentsPainTreatment OutcomeGanglia, SpinalSpinal Cord IschemiaDisability EvaluationMotor NeuronsNeurosurgical ProceduresTime FactorsLower ExtremityParaplegiaRats, Sprague-DawleyThoracic VertebraeInsurance, Health, ReimbursementTuberculosis, SpinalInjections, IntravenousInjections, IntramuscularLaminectomySpinal CurvaturesPosterior Horn CellsHematoma, Epidural, SpinalSpinal Muscular Atrophies of ChildhoodInjections, SubcutaneousDrug CombinationsInjections, Intra-ArticularSpinal FracturesOutcome Assessment (Health Care)HyperalgesiaInjections, IntralesionalHealth Care CostsSpinal Cord RegenerationDisease Models, AnimalQuadriplegiaTrigeminal Nucleus, SpinalLocomotionManipulation, SpinalInjections, IntraperitonealMedicareAxons