Arthritis, PsoriaticArthritis, RheumatoidArthritisPsoriasisArthritis, ExperimentalArthritis, InfectiousArthritis, JuvenileArthritis, ReactiveJointsAntirheumatic AgentsSynovial MembraneSkinSpondylitis, AnkylosingSynovial FluidSynovitisNail DiseasesRheumatic DiseasesSeverity of Illness IndexRheumatoid FactorHand JointsSpondylitisSpondylarthropathiesReceptors, Tumor Necrosis FactorToe JointOsteoarthritisTumor Necrosis Factor-alphaMethotrexateArthrographyBlood SedimentationFinger JointFoot JointsAntibodies, MonoclonalSpondylarthritisImmunoglobulin GDermatologic AgentsPeriostitisTreatment OutcomeArthritis, GoutyHLA-C AntigensAntibodies, Monoclonal, HumanizedRheumatologySkin DiseasesMice, Inbred DBASacroiliac JointSkin AgingHLA-B27 AntigenSkin NeoplasmsGenetic Predisposition to DiseaseAutoantibodiesKnee JointInjections, Intra-ArticularIritisAnti-Inflammatory AgentsDouble-Blind MethodCollagen Type IIJoint DiseasesBiological MarkersDisability EvaluationAutoimmune DiseasesImmunosuppressive AgentsBiological ProductsCase-Control StudiesRats, Inbred LewAge of OnsetImmunologic FactorsDrug Therapy, CombinationCohort StudiesEtretinateHLA-B39 Antigen