Arthritis, PsoriaticArthritis, RheumatoidArthritisPsoriasisArthritis, ExperimentalArthritis, InfectiousArthritis, JuvenileArthritis, ReactiveJointsAntirheumatic AgentsSynovial MembraneSpondylitis, AnkylosingSynovial FluidSynovitisNail DiseasesRheumatic DiseasesSeverity of Illness IndexRheumatoid FactorHand JointsTumor Necrosis Factor-alphaReceptors, Tumor Necrosis FactorSpondylarthropathiesSpondylitisImmunoglobulin GToe JointOsteoarthritisMethotrexateAntibodies, MonoclonalBlood SedimentationArthrographyFinger JointFoot JointsSpondylarthritisDermatologic AgentsPeriostitisImmune SystemTreatment OutcomeArthritis, GoutyHLA-C AntigensAntibodies, Monoclonal, HumanizedRheumatologyMice, Inbred DBAHLA-B27 AntigenSacroiliac JointAutoantibodiesGenetic Predisposition to DiseaseKnee JointInjections, Intra-ArticularIritisCytokinesAnti-Inflammatory AgentsAutoimmune DiseasesBiological MarkersT-LymphocytesCollagen Type IIDouble-Blind MethodJoint DiseasesDisability EvaluationImmunologic FactorsImmunosuppressive AgentsRats, Inbred LewCase-Control StudiesBiological ProductsImmune ToleranceEnzyme-Linked Immunosorbent AssayCohort StudiesDrug Therapy, CombinationAge of OnsetEtretinateHLA-B39 AntigenHLA Antigens