Arthritis, PsoriaticPsoriasisArthritis, RheumatoidArthritisArthritis, ExperimentalArthritis, InfectiousArthritis, JuvenileArthritis, ReactiveJointsAntirheumatic AgentsDermatologic AgentsSpondylitis, AnkylosingSynovial MembraneSynovial FluidSeverity of Illness IndexNail DiseasesSynovitisRheumatic DiseasesHand JointsRheumatoid FactorReceptors, Tumor Necrosis FactorHLA-C AntigensSpondylitisTumor Necrosis Factor-alphaMethotrexateSpondylarthropathiesOsteoarthritisToe JointTreatment OutcomeAntibodies, MonoclonalArthrographyImmunoglobulin GBlood SedimentationFinger JointSpondylarthritisFoot JointsPeriostitisAntibodies, Monoclonal, HumanizedGenetic Predisposition to DiseaseArthritis, GoutyRheumatologySkinPUVA TherapyUltraviolet TherapySacroiliac JointAnti-Inflammatory AgentsHLA-B27 AntigenMice, Inbred DBACase-Control StudiesQuality of LifeAutoantibodiesIritisKnee JointQuestionnairesCohort StudiesDisability EvaluationInjections, Intra-ArticularDouble-Blind MethodAge of OnsetPrevalenceBiological MarkersImmunosuppressive AgentsBiological ProductsAutoimmune DiseasesJoint DiseasesProspective StudiesImmunologic FactorsRisk FactorsCollagen Type IICornified Envelope Proline-Rich ProteinsEtretinateFollow-Up StudiesTime FactorsDrug Therapy, CombinationNailsGene FrequencyCytokinesAnti-Inflammatory Agents, Non-SteroidalRats, Inbred LewCross-Sectional StudiesHealth StatusHLA AntigensCoal Tar