Arthritis, PsoriaticArthritis, RheumatoidArthritisPsoriasisArthritis, ExperimentalArthritis, InfectiousArthritis, JuvenileRemission InductionArthritis, ReactiveJointsAntirheumatic AgentsSynovial MembraneSpondylitis, AnkylosingSynovial FluidRemission, SpontaneousSeverity of Illness IndexSynovitisNail DiseasesRheumatic DiseasesRheumatoid FactorHand JointsMethotrexateTreatment OutcomeReceptors, Tumor Necrosis FactorSpondylitisSpondylarthropathiesToe JointOsteoarthritisTumor Necrosis Factor-alphaBlood SedimentationAntibodies, MonoclonalArthrographyFoot JointsFinger JointImmunoglobulin GSpondylarthritisDermatologic AgentsPeriostitisAntibodies, Monoclonal, HumanizedArthritis, GoutyRheumatologyHLA-C AntigensMice, Inbred DBASacroiliac JointHLA-B27 AntigenAutoantibodiesGenetic Predisposition to DiseaseAnti-Inflammatory AgentsImmunosuppressive AgentsInjections, Intra-ArticularKnee JointDouble-Blind MethodIritisDrug Therapy, CombinationBiological MarkersCollagen Type IIFollow-Up StudiesDisability EvaluationJoint DiseasesAutoimmune DiseasesImmunologic FactorsBiological ProductsCohort StudiesCase-Control StudiesAge of OnsetTime FactorsProspective StudiesRats, Inbred LewAnti-Inflammatory Agents, Non-SteroidalEtretinateHLA-B39 Antigen