Arthritis, PsoriaticArthritis, RheumatoidArthritisSpondylarthritisSpondylitis, AnkylosingRheumatic DiseasesPsoriasisSpondylarthropathiesArthritis, ExperimentalTendinopathyArthritis, InfectiousSacroiliac JointJointsAntirheumatic AgentsArthritis, JuvenileArthritis, ReactiveHLA-B27 AntigenSeverity of Illness IndexSynovial MembraneSynovial FluidSynovitisNail DiseasesBursitisAnkylosisRheumatoid FactorHand JointsTreatment OutcomeAchilles TendonSpondylitisToe JointReceptors, Tumor Necrosis FactorOsteoarthritisMethotrexateTumor Necrosis Factor-alphaArthrographyBlood SedimentationFinger JointFoot JointsAntibodies, MonoclonalUltrasonography, DopplerImmunoglobulin GPeriostitisDermatologic AgentsArthritis, GoutyHLA-C AntigensAntibodies, Monoclonal, HumanizedRheumatologyTendonsMice, Inbred DBAGenetic Predisposition to DiseaseAutoantibodiesKnee JointInjections, Intra-ArticularReproducibility of ResultsIritisAnti-Inflammatory AgentsCollagen Type IIDouble-Blind MethodJoint DiseasesDisability EvaluationBiological MarkersAutoimmune DiseasesBiological ProductsImmunosuppressive Agents