Spinal StenosisLumbar VertebraeSpinal CordDecompression, SurgicalSpinal CanalLaminectomySpondylolisthesisCarotid StenosisAortic Valve StenosisInjections, EpiduralSpinal Cord InjuriesRadiculopathyLigamentum FlavumSpinal FusionCoronary StenosisLumbosacral RegionIntervertebral Disc DisplacementSpinal DiseasesSciaticaTracheal StenosisSpinal Nerve RootsSpinal Cord CompressionPolyradiculopathyMyelographyLow Back PainTreatment OutcomeIntermittent ClaudicationSpondylosisPyloric StenosisPain MeasurementMitral Valve StenosisDisability EvaluationConstriction, PathologicPulmonary Valve StenosisBack PainInjections, SpinalCervical VertebraeSteroidsAnesthetics, LocalOrthopedic ProceduresMagnetic Resonance ImagingFailed Back Surgery SyndromeSacrumNeurosurgical ProceduresEpidural SpaceCauda EquinaProstheses and ImplantsFollow-Up StudiesSpineTissue AdhesionsProspective StudiesSpinal NervesSpinal Cord DiseasesSurgical Procedures, Minimally InvasiveRetrospective StudiesDura MaterFluoroscopyAnesthesia, SpinalSeverity of Illness IndexTomography, X-Ray ComputedChronic PainSpinal Cord NeoplasmsPostoperative ComplicationsInternal FixatorsSaline Solution, HypertonicThoracic VertebraePainBetamethasoneSpinal NeoplasmsIntervertebral Disc DegenerationNerve Compression SyndromesRenal Artery ObstructionRecovery of FunctionOrthopedic Fixation DevicesTriamcinoloneAortic Stenosis, SubvalvularDiskectomyAchondroplasiaTime FactorsOsteoarthritis, SpineDiagnostic Techniques, NeurologicalAortic Stenosis, SupravalvularLidocainePost-Dural Puncture HeadacheSpinal OsteophytosisLipomatosisStentsWalkingIntervertebral DiscCoronary AngiographyOutcome Assessment (Health Care)Zygapophyseal JointPredictive Value of TestsCarotid Artery, InternalSpinal FracturesLordosisEndarterectomy, CarotidAngioplasty, BalloonProsthesis ImplantationUltrasonography, Doppler, Duplex