Spondylitis, AnkylosingSpondylitisReceptors, Tumor Necrosis FactorAntirheumatic AgentsImmunoglobulin GHLA-B27 AntigenSacroiliac JointArthritis, RheumatoidArthritis, PsoriaticSpondylarthritisTumor Necrosis Factor-alphaPsoriasisTreatment OutcomeSeverity of Illness IndexArthritis, JuvenileSpineAnti-Inflammatory Agents, Non-SteroidalSpondylarthropathiesBlood SedimentationMethotrexateAntibodies, MonoclonalSulfasalazineImmunologic FactorsUveitis, AnteriorDouble-Blind MethodInjections, SubcutaneousAntibodies, Monoclonal, HumanizedArthritisDermatologic AgentsImmunosuppressive AgentsDrug Therapy, CombinationArthritis, ReactiveRheumatic DiseasesJointsIritisProduct Surveillance, PostmarketingTuberculosis, SpinalBalneologyDrug SubstitutionC-Reactive ProteinDrug CostsTreatment FailureLumbar VertebraeKyphosisDisability EvaluationDrug Administration ScheduleThoracic VertebraeHLA AntigensWegener GranulomatosisHydroxychloroquineStill's Disease, Adult-OnsetPain MeasurementClinical Trials, Phase IV as TopicCervical VertebraeInterleukin 1 Receptor Antagonist ProteinQuality of LifePlacebosOsteitisBack PainPseudarthrosisFollow-Up StudiesSpinal DiseasesAnti-Inflammatory AgentsHidradenitis Suppurativa