Spinal StenosisLumbar VertebraeDecompression, SurgicalLaminectomySpinal CanalLumbosacral RegionRadiculopathySpondylolisthesisSpinal CordLigamentum FlavumInjections, EpiduralSpinal FusionIntermittent ClaudicationPolyradiculopathySciaticaSpondylosisDisability EvaluationPain MeasurementSpinal Nerve RootsLow Back PainMyelographyProstheses and ImplantsCauda EquinaNeurosurgical ProceduresIntervertebral Disc DisplacementTreatment OutcomeOrthopedic ProceduresBack PainCarotid StenosisSpinal Cord InjuriesMagnetic Resonance ImagingAortic Valve StenosisDiagnostic Techniques, NeurologicalSteroidsSpinal DiseasesDura MaterLipomatosisFollow-Up StudiesSurgical Procedures, Minimally InvasiveProspective StudiesAnesthetics, LocalCoronary StenosisWalkingPainInternal FixatorsSeverity of Illness IndexRetrospective StudiesSpinal Cord CompressionTracheal StenosisSpinal NervesInjections, SpinalRecovery of FunctionTomography, X-Ray ComputedPostoperative ComplicationsOutcome Assessment (Health Care)Physical Therapy ModalitiesPyloric StenosisEpidural SpaceMitral Valve StenosisCervical VertebraeConstriction, PathologicSpinePulmonary Valve StenosisPatient SatisfactionSacrumBiomechanical PhenomenaQuestionnairesFailed Back Surgery SyndromeIntervertebral Disc DegenerationSpinal Cord DiseasesPredictive Value of TestsOrthopedic Fixation DevicesNerve Compression SyndromesAnesthesia, SpinalThoracic VertebraeQuality of LifeSpinal NeoplasmsTissue AdhesionsSpinal Cord NeoplasmsTime FactorsIntervertebral DiscCohort StudiesMotor NeuronsPost-Dural Puncture HeadacheZygapophyseal JointOsteoarthritis, SpineDiskectomyFluoroscopyChronic Pain