Arthritis, PsoriaticSpondylitis, AnkylosingArthritis, RheumatoidArthritisSpondylitisPsoriasisArthritis, ExperimentalArthritis, InfectiousArthritis, JuvenileArthritis, ReactiveAntirheumatic AgentsHLA-B27 AntigenJointsSynovial MembraneSacroiliac JointSynovial FluidSeverity of Illness IndexRheumatic DiseasesSpondylarthritisSpondylarthropathiesSynovitisBlood SedimentationNail DiseasesReceptors, Tumor Necrosis FactorRheumatoid FactorHand JointsTumor Necrosis Factor-alphaAntibodies, MonoclonalOsteoarthritisImmunoglobulin GMethotrexateToe JointTreatment OutcomeIritisArthrographyFinger JointFoot JointsRheumatologyAntibodies, Monoclonal, HumanizedPeriostitisDermatologic AgentsSpineArthritis, GoutyGenetic Predisposition to DiseaseHLA-C AntigensMice, Inbred DBAAutoantibodiesHLA AntigensJoint DiseasesDouble-Blind MethodDisability EvaluationKnee JointAnti-Inflammatory Agents, Non-SteroidalAnti-Inflammatory AgentsBiological MarkersInjections, Intra-ArticularCase-Control StudiesSulfasalazineCollagen Type IIAutoimmune DiseasesHLA-B AntigensImmunologic FactorsAge of OnsetC-Reactive ProteinSpinal DiseasesCohort StudiesImmunosuppressive AgentsGene FrequencyQuality of LifeDrug Therapy, CombinationBiological ProductsUveitis, AnteriorRats, Inbred LewFollow-Up StudiesTuberculosis, SpinalProspective StudiesEtretinate