Pain MeasurementVisual Analog ScalePain, PostoperativePainVisual CortexEvoked Potentials, VisualVisual PerceptionTreatment OutcomeVisual AcuityVisual FieldsDouble-Blind MethodQuestionnairesQuality of LifeVisual PathwaysSeverity of Illness IndexProspective StudiesAnesthetics, LocalPatient SatisfactionAnalgesics, OpioidReproducibility of ResultsDisability EvaluationAnalgesia, Patient-ControlledTime FactorsPsychometricsAnalgesia, EpiduralFollow-Up StudiesPruritusLidocaineSingle-Blind MethodLumbar VertebraeInjections, Intra-ArticularAnalysis of VariancePain ManagementAnesthesia, LocalCross-Over StudiesAnalgesiaVertebroplastyPattern Recognition, VisualBupivacaineAnalgesicsPhotic StimulationRange of Motion, ArticularFatigueTramadolLow Back PainIntervertebral Disc DisplacementMorphinePilot ProjectsHealth StatusRecovery of FunctionSpinal FusionCross-Sectional StudiesAnalgesia, ObstetricalOsteoarthritis, KneeStatistics, NonparametricHealth Status IndicatorsFractures, CompressionDiskectomyFibromyalgiaBack PainNerve BlockActivities of Daily LivingKetorolacChronic DiseaseRadiculopathySmilingRetrospective StudiesFentanylPsychiatric Status Rating ScalesAcupuncture AnalgesiaVisual Field TestsMeperidineAnxietySatiationOutcome Assessment (Health Care)Molar, ThirdSpinal FracturesPain PerceptionAnesthesia, DentalTranscutaneous Electric Nerve StimulationVision DisordersAnalgesics, Non-NarcoticSickness Impact ProfileAppetiteVision, OcularSpinal StenosisDepressionFacial PainArthralgiaPain, IntractableArthritis, RheumatoidPrilocaineAnti-Inflammatory Agents, Non-SteroidalManifest Anxiety ScaleDyspneaPlacebosMagnetic Resonance ImagingArthroscopyDecompression, SurgicalHunger