Arthritis, PsoriaticArthritis, RheumatoidArthritisPsoriasisArthritis, ExperimentalArthritis, InfectiousArthritis, JuvenileArthritis, ReactiveJointsAntirheumatic AgentsSynovial MembraneSpondylitis, AnkylosingSynovial FluidSynovitisNail DiseasesSeverity of Illness IndexRheumatic DiseasesRheumatoid FactorHand JointsSpondylitisSpondylarthropathiesReceptors, Tumor Necrosis FactorToe JointOsteoarthritisMethotrexateTumor Necrosis Factor-alphaBlood SedimentationArthrographyFinger JointFoot JointsAntibodies, MonoclonalSpondylarthritisImmunoglobulin GDermatologic AgentsPeriostitisTreatment OutcomeArthritis, GoutyHLA-C AntigensAntibodies, Monoclonal, HumanizedRheumatologyMice, Inbred DBASacroiliac JointHLA-B27 AntigenGenetic Predisposition to DiseaseAutoantibodiesKnee JointInjections, Intra-ArticularIritisAnti-Inflammatory AgentsDouble-Blind MethodCollagen Type IIBiological MarkersJoint DiseasesDisability EvaluationAutoimmune DiseasesCase-Control StudiesBiological ProductsImmunosuppressive AgentsRats, Inbred LewCohort StudiesDrug Therapy, CombinationAge of OnsetImmunologic FactorsEtretinateHLA-B39 Antigen