Arthritis, PsoriaticPsoriasisArthritis, RheumatoidArthritisArthritis, ExperimentalArthritis, InfectiousDermatologic AgentsArthritis, JuvenileArthritis, ReactiveJointsAntirheumatic AgentsSpondylitis, AnkylosingSynovial MembraneNail DiseasesSeverity of Illness IndexSynovial FluidHLA-C AntigensPUVA TherapyUltraviolet TherapyRheumatic DiseasesSynovitisHand JointsReceptors, Tumor Necrosis FactorRheumatoid FactorTumor Necrosis Factor-alphaMethotrexateSpondylitisTreatment OutcomeAntibodies, MonoclonalSpondylarthropathiesSkinToe JointOsteoarthritisArthrographyImmunoglobulin GSpondylarthritisBlood SedimentationFinger JointFoot JointsAntibodies, Monoclonal, HumanizedGenetic Predisposition to DiseasePeriostitisCoal TarAnti-Inflammatory AgentsRheumatologyAcitretinArthritis, GoutyAnthralinSacroiliac JointKeratolytic AgentsHLA-B27 AntigenCase-Control StudiesMice, Inbred DBAImmunosuppressive AgentsIritisBiological ProductsDisease ManagementDouble-Blind MethodImmunologic FactorsCornified Envelope Proline-Rich ProteinsAutoantibodiesKeratinocytesAge of OnsetQuality of LifeEtretinateBiological MarkersAutoimmune DiseasesCohort StudiesKnee JointInjections, Intra-ArticularNailsClobetasolDisability EvaluationDermatologyCytokinesJoint DiseasesDrug Therapy, CombinationCollagen Type IIProspective StudiesGene FrequencyPhototherapyEpidermisRisk FactorsAnti-Inflammatory Agents, Non-SteroidalInterleukin-17HLA AntigensT-LymphocytesPhosphodiesterase 4 InhibitorsTime FactorsFollow-Up StudiesBiological TherapyInterleukin-12 Subunit p40QuestionnairesPrevalenceGenotypeSkin DiseasesInterleukin-23Retrospective StudiesRats, Inbred Lew