Injections, EpiduralFluoroscopyFailed Back Surgery SyndromeAnesthetics, LocalAnesthesia, EpiduralSteroidsLow Back PainRadiculopathySpinal StenosisNerve BlockLidocaineIntervertebral Disc DisplacementPain ManagementLumbosacral RegionDouble-Blind MethodEpidural SpaceChronic PainPain MeasurementChronic DiseaseDisability EvaluationBack PainBetamethasoneInjectionsNeck PainAnalgesia, EpiduralOutcome Assessment (Health Care)Cervical VertebraeInjections, SpinalTreatment OutcomeBupivacaineSciaticaTriamcinoloneLumbar VertebraeAdrenal Cortex HormonesThiamylalPseudarthrosisDiscitisSpinal Nerve RootsIntervertebral DiscAnalgesiaAnti-Inflammatory AgentsAnalgesicsSpineAnalgesics, OpioidLower ExtremityInsurance, Health, ReimbursementInjections, IntramuscularInjections, Intravenous