Injections, EpiduralSteroidsAnesthetics, LocalFluoroscopyAnestheticsAnesthesia, EpiduralRadiculopathyLumbosacral RegionLidocaineFailed Back Surgery SyndromeLow Back PainEpidural SpaceChronic PainAnesthetics, InhalationBetamethasoneBack PainNerve BlockIntervertebral Disc DisplacementSpinal StenosisInjectionsNeck PainPain ManagementBupivacaineAnesthetics, GeneralAnalgesia, EpiduralDouble-Blind MethodCervical VertebraeInjections, SpinalAnesthetics, IntravenousAdrenal Cortex HormonesIsofluraneTriamcinolonePain MeasurementSciaticaLumbar VertebraeHalothaneThiamylalChronic DiseasePseudarthrosisAnesthetics, CombinedSpinal Nerve RootsAnti-Inflammatory AgentsDiscitisAnalgesiaEnfluraneAnalgesicsAnalgesics, OpioidIntervertebral DiscMethyl EthersTreatment OutcomeAnesthesiaSpineAnesthesia, LocalPropofolAnesthetics, DissociativeGonadal Steroid HormonesReceptors, SteroidDisability EvaluationAnesthesia, GeneralMethoxyfluraneInjections, IntravenousLower ExtremityTime FactorsInsurance, Health, ReimbursementInjections, IntramuscularAnesthesia, InhalationAnesthesia, DentalInjections, Intra-ArticularKetaminePainNeurosurgical ProceduresBenzocaineDrug CombinationsTetracainePrilocaineNitrous OxideThiopentalInjections, SubcutaneousEtomidateInjections, IntralesionalProcaineDose-Response Relationship, DrugHealth Care CostsEtherPentobarbitalOutcome Assessment (Health Care)MepivacainePregnanedionesAnesthesiologyInjections, IntraperitonealAnesthesia, IntravenousMedicareDibucaine