Pain MeasurementVisual Analog ScalePain, PostoperativeVisual CortexPainEvoked Potentials, VisualVisual PerceptionVisual AcuityVisual FieldsTreatment OutcomeDouble-Blind MethodVisual PathwaysAnesthetics, LocalProspective StudiesQuestionnairesQuality of LifeAnalgesics, OpioidSeverity of Illness IndexReproducibility of ResultsAnalgesia, Patient-ControlledPatient SatisfactionDisability EvaluationPruritusAnalgesia, EpiduralTime FactorsLidocainePain ManagementLumbar VertebraeInjections, Intra-ArticularAnesthesia, LocalCross-Over StudiesSingle-Blind MethodAnalgesiaPattern Recognition, VisualVertebroplastyFollow-Up StudiesBupivacaineAnalgesicsPhotic StimulationLow Back PainPsychometricsIntervertebral Disc DisplacementTramadolMorphineRange of Motion, ArticularAnalysis of VarianceSpinal FusionAnalgesia, ObstetricalOsteoarthritis, KneeFractures, CompressionDiskectomyBack PainFibromyalgiaFatigueNerve BlockPilot ProjectsStatistics, NonparametricKetorolacOutcome Assessment (Health Care)Recovery of FunctionRadiculopathyAcupuncture AnalgesiaFentanylVisual Field TestsRisk AssessmentVision DisordersMagnetic Resonance ImagingMeperidineMolar, ThirdSatiationAnesthesia, DentalPain PerceptionSpinal FracturesVision, OcularTranscutaneous Electric Nerve StimulationChronic DiseaseAppetiteAnalgesics, Non-NarcoticHealth Status IndicatorsFacial PainManifest Anxiety ScaleSpinal StenosisPain, IntractableArthroscopyArthralgiaAnti-Inflammatory Agents, Non-SteroidalPrilocaineDyspneaActivities of Daily LivingPlacebosHungerExercise TherapyDecompression, SurgicalPsychomotor PerformanceDiclofenacNeck PainTooth ExtractionHealth StatusShoulder PainNeedles