Arthritis, PsoriaticPsoriasisArthritis, RheumatoidArthritisCardiovascular DiseasesArthritis, ExperimentalArthritis, InfectiousArthritis, JuvenileArthritis, ReactiveJointsAntirheumatic AgentsDermatologic AgentsSynovial MembraneSpondylitis, AnkylosingSynovial FluidSeverity of Illness IndexNail DiseasesRisk FactorsRheumatic DiseasesSynovitisHand JointsRheumatoid FactorReceptors, Tumor Necrosis FactorHLA-C AntigensTumor Necrosis Factor-alphaMethotrexateSpondylitisSpondylarthropathiesOsteoarthritisToe JointTreatment OutcomeAntibodies, MonoclonalArthrographyImmunoglobulin GBlood SedimentationFinger JointSpondylarthritisFoot JointsCohort StudiesBiological MarkersGenetic Predisposition to DiseasePeriostitisAntibodies, Monoclonal, HumanizedArthritis, GoutyProspective StudiesSkinCase-Control StudiesPrevalenceRheumatologyPUVA TherapyUltraviolet TherapyAnti-Inflammatory AgentsSacroiliac JointFollow-Up StudiesHLA-B27 AntigenDouble-Blind MethodMice, Inbred DBAC-Reactive ProteinCross-Sectional StudiesAutoantibodiesIritisKnee JointIncidenceQuestionnairesInjections, Intra-ArticularAge of OnsetDisability EvaluationTime FactorsBiological ProductsImmunosuppressive AgentsQuality of LifeAutoimmune DiseasesImmunologic FactorsInflammationUnited StatesCollagen Type IIDrug Therapy, CombinationGene FrequencyJoint DiseasesCornified Envelope Proline-Rich ProteinsEtretinateGenotypeNailsCytokinesComorbidityLongitudinal StudiesHypertensionAnti-Inflammatory Agents, Non-SteroidalAtherosclerosisChronic DiseaseHealth StatusDisease Models, AnimalPolymorphism, GeneticRisk AssessmentDisease ProgressionRats, Inbred LewPolymorphism, Single NucleotideSex FactorsHLA AntigensCoal Tar