Spinal StenosisLumbar VertebraeSpinal CordDecompression, SurgicalSpinal CanalLaminectomySpondylolisthesisCarotid StenosisAortic Valve StenosisInjections, EpiduralSpinal Cord InjuriesRadiculopathyLigamentum FlavumSpinal FusionCoronary StenosisLumbosacral RegionIntervertebral Disc DisplacementSpinal DiseasesSciaticaTracheal StenosisSpinal Nerve RootsSpinal Cord CompressionPolyradiculopathyTreatment OutcomeLow Back PainMyelographyIntermittent ClaudicationPain MeasurementSpondylosisPyloric StenosisDisability EvaluationMitral Valve StenosisConstriction, PathologicPulmonary Valve StenosisBack PainCervical VertebraeInjections, SpinalMagnetic Resonance ImagingSteroidsAnesthetics, LocalOrthopedic ProceduresFollow-Up StudiesFailed Back Surgery SyndromeSacrumProspective StudiesNeurosurgical ProceduresSeverity of Illness IndexEpidural SpaceCauda EquinaProstheses and ImplantsSpineTissue AdhesionsRetrospective StudiesSpinal Cord DiseasesSpinal NervesDura MaterTomography, X-Ray ComputedSurgical Procedures, Minimally InvasiveAnesthesia, SpinalFluoroscopyPainChronic PainSpinal Cord NeoplasmsPostoperative ComplicationsSaline Solution, HypertonicInternal FixatorsTime FactorsThoracic VertebraeBetamethasoneSpinal NeoplasmsNerve Compression SyndromesIntervertebral Disc DegenerationRecovery of FunctionRenal Artery ObstructionOrthopedic Fixation DevicesTriamcinoloneDiskectomyDiagnostic Techniques, NeurologicalAortic Stenosis, SubvalvularAchondroplasiaOsteoarthritis, SpineSpinal OsteophytosisPost-Dural Puncture HeadacheLidocainePredictive Value of TestsAortic Stenosis, SupravalvularLipomatosisWalkingOutcome Assessment (Health Care)StentsIntervertebral DiscQuestionnairesCoronary AngiographyZygapophyseal JointCarotid Artery, InternalRisk FactorsEndarterectomy, CarotidUltrasonography, Doppler, DuplexSpinal FracturesLordosis