Arthritis, PsoriaticPsoriasisArthritis, RheumatoidArthritisArthritis, ExperimentalArthritis, InfectiousArthritis, JuvenileAntirheumatic AgentsArthritis, ReactiveJointsSpondylitis, AnkylosingSynovial MembraneSynovial FluidNail DiseasesDermatologic AgentsSeverity of Illness IndexRheumatic DiseasesHand JointsSynovitisSpondylitisRheumatoid FactorReceptors, Tumor Necrosis FactorSpondylarthropathiesToe JointTumor Necrosis Factor-alphaMethotrexateHLA-C AntigensOsteoarthritisArthrographyFinger JointAntibodies, MonoclonalSpondylarthritisFoot JointsBlood SedimentationImmunoglobulin GPeriostitisTreatment OutcomeAntibodies, Monoclonal, HumanizedSacroiliac JointRheumatologyGenetic Predisposition to DiseaseHLA-B27 AntigenArthritis, GoutyIritisSkinAnti-Inflammatory AgentsDouble-Blind MethodMice, Inbred DBAKnee JointAutoantibodiesInjections, Intra-ArticularDisability EvaluationCase-Control StudiesBiological ProductsBiological MarkersEtretinateImmunosuppressive AgentsAge of OnsetCornified Envelope Proline-Rich ProteinsJoint DiseasesImmunologic FactorsCohort StudiesAutoimmune DiseasesQuality of LifeNails