Spinal StenosisRadiculopathyLumbar VertebraeDecompression, SurgicalSpinal Nerve RootsUltrasonic Surgical ProceduresCarotid StenosisAortic Valve StenosisCervical VertebraeSpinal CordSpinal CanalLaminectomyCoronary StenosisTracheal StenosisMagnetic Resonance ImagingSpondylolisthesisInjections, EpiduralPyloric StenosisMitral Valve StenosisSpinal Cord InjuriesConstriction, PathologicPulmonary Valve StenosisObserver VariationLigamentum FlavumSpinal FusionLumbosacral RegionIntervertebral Disc DisplacementSpinal DiseasesSciaticaTreatment OutcomeSpinal Cord CompressionPolyradiculopathyMyelographyLow Back PainIntermittent ClaudicationSpondylosisPain MeasurementDisability EvaluationRenal Artery ObstructionFollow-Up StudiesAortic Stenosis, SubvalvularBack PainProspective StudiesAortic Stenosis, SupravalvularSeverity of Illness IndexInjections, SpinalSteroidsOrthopedic ProceduresAnesthetics, LocalFailed Back Surgery SyndromeRetrospective StudiesNeurosurgical ProceduresStentsSacrumTomography, X-Ray ComputedCoronary AngiographyCauda EquinaCarotid Artery, InternalEpidural SpaceProstheses and ImplantsEndarterectomy, CarotidAngioplasty, BalloonUltrasonography, Doppler, DuplexLaryngostenosisPostoperative ComplicationsAortic ValveTissue AdhesionsSpineTricuspid Valve StenosisSpinal Cord DiseasesSurgical Procedures, Minimally InvasiveFluoroscopySpinal NervesDiscrete Subaortic StenosisDura MaterAngiographyMagnetic Resonance AngiographyAnesthesia, SpinalTime FactorsPredictive Value of TestsArterial Occlusive DiseasesPyloric Stenosis, HypertrophicBlood Flow VelocityChronic PainCatheterizationInternal FixatorsSaline Solution, HypertonicSpinal Cord NeoplasmsAngiography, Digital SubtractionHeart Valve Prosthesis ImplantationThoracic VertebraeNerve Compression SyndromesEsophageal StenosisBetamethasoneIntervertebral Disc DegenerationPainRecovery of FunctionSpinal NeoplasmsAngioplastyIntracranial Arteriosclerosis