Arthritis, PsoriaticArthritis, RheumatoidArthritisPsoriasisArthritis, ExperimentalArthritis, InfectiousArthritis, JuvenileArthritis, ReactiveJointsAntirheumatic AgentsSynovial MembraneSpondylitis, AnkylosingSynovial FluidSynovitisNail DiseasesRheumatic DiseasesSeverity of Illness IndexRheumatoid FactorHand JointsSpondylitisSpondylarthropathiesToe JointReceptors, Tumor Necrosis FactorOsteoarthritisMethotrexateTumor Necrosis Factor-alphaArthrographyBlood SedimentationFinger JointFoot JointsAntibodies, MonoclonalSpondylarthritisImmunoglobulin GPeriostitisDermatologic AgentsArthritis, GoutyTreatment OutcomeHLA-C AntigensAntibodies, Monoclonal, HumanizedRheumatologyMice, Inbred DBASacroiliac JointHLA-B27 AntigenGenetic Predisposition to DiseaseAutoantibodiesKnee JointInjections, Intra-ArticularIritisAnti-Inflammatory AgentsCollagen Type IIDouble-Blind MethodJoint DiseasesDisability EvaluationBiological MarkersAutoimmune DiseasesBiological ProductsImmunosuppressive AgentsRats, Inbred LewCase-Control StudiesAge of OnsetImmunologic FactorsEtretinateDrug Therapy, CombinationCohort StudiesHLA-B39 Antigen