Arthritis, PsoriaticPsoriasisScalpArthritis, RheumatoidArthritisArthritis, ExperimentalArthritis, InfectiousArthritis, JuvenileArthritis, ReactiveJointsDermatologic AgentsAntirheumatic AgentsSynovial MembraneSpondylitis, AnkylosingSynovial FluidNail DiseasesSeverity of Illness IndexSynovitisRheumatic DiseasesHand JointsRheumatoid FactorReceptors, Tumor Necrosis FactorHLA-C AntigensSpondylitisTumor Necrosis Factor-alphaMethotrexateSpondylarthropathiesOsteoarthritisToe JointAntibodies, MonoclonalArthrographyBlood SedimentationImmunoglobulin GFinger JointSpondylarthritisFoot JointsTreatment OutcomePeriostitisAntibodies, Monoclonal, HumanizedSkinArthritis, GoutyGenetic Predisposition to DiseaseRheumatologyPUVA TherapyUltraviolet TherapySacroiliac JointHLA-B27 AntigenAnti-Inflammatory AgentsMice, Inbred DBAAlopeciaIritisAutoantibodiesCase-Control StudiesKnee JointDouble-Blind MethodInjections, Intra-ArticularDisability EvaluationBiological ProductsAge of OnsetImmunosuppressive AgentsBiological MarkersAutoimmune DiseasesCohort StudiesImmunologic FactorsCollagen Type IIQuality of LifeJoint DiseasesCornified Envelope Proline-Rich ProteinsEtretinateNailsDrug Therapy, CombinationGene FrequencyPrevalenceCytokinesKeratolytic AgentsRats, Inbred LewProspective StudiesAnti-Inflammatory Agents, Non-SteroidalHLA AntigensRisk FactorsQuestionnairesCoal TarTime FactorsDermatitis, Seborrheic