Arthritis, PsoriaticPsoriasisArthritis, RheumatoidArthritisPUVA TherapyDermatologic AgentsUltraviolet TherapyAcitretinKeratolytic AgentsArthritis, ExperimentalArthritis, InfectiousSeverity of Illness IndexArthritis, JuvenileArthritis, ReactiveJointsAntirheumatic AgentsSynovial MembraneSpondylitis, AnkylosingSynovial FluidAntibodies, Monoclonal, HumanizedAntibodies, MonoclonalNail DiseasesTreatment OutcomeSynovitisRheumatic DiseasesHand JointsRheumatoid FactorReceptors, Tumor Necrosis FactorHLA-C AntigensCohort StudiesSpondylitisTumor Necrosis Factor-alphaMethotrexateSpondylarthropathiesToe JointOsteoarthritisArthrographyBlood SedimentationFinger JointImmunoglobulin GSpondylarthritisFoot JointsPeriostitisGreat BritainArthritis, GoutyGenetic Predisposition to DiseaseRheumatologyRisk FactorsSkinSacroiliac JointHLA-B27 AntigenCardiovascular DiseasesMice, Inbred DBAAnti-Inflammatory AgentsIritisAutoantibodiesKnee JointInjections, Intra-ArticularDouble-Blind MethodCase-Control StudiesBiological ProductsImmunosuppressive AgentsBiological MarkersAutoimmune DiseasesImmunologic FactorsCollagen Type IIDisability EvaluationAge of OnsetCornified Envelope Proline-Rich ProteinsEtretinateJoint DiseasesNailsQuality of LifeGene FrequencyCytokinesDrug Therapy, Combination