Arthritis, PsoriaticArthritisArthritis, RheumatoidTreponemaPsoriasisTreponema pallidumSyndromeSyphilis SerodiagnosisArthritis, ExperimentalAntirheumatic AgentsSyphilisArthritis, InfectiousSpondylitis, AnkylosingJointsArthritis, JuvenileArthritis, ReactiveTreponema Immobilization TestYawsSynovial MembraneNail DiseasesSynovial FluidFlocculation TestsHand JointsRheumatic DiseasesSeverity of Illness IndexComplement Fixation TestsSpondylitisSynovitisToe JointSpondylarthropathiesReceptors, Tumor Necrosis FactorRheumatoid FactorTumor Necrosis Factor-alphaFinger JointSpondylarthritisDermatologic AgentsFoot JointsPeriostitisArthrographyMethotrexateAntibodies, MonoclonalBlood SedimentationOsteoarthritisTreatment OutcomeImmunoglobulin GHLA-C AntigensAntigens, BacterialAntibodies, Monoclonal, HumanizedSacroiliac JointDown SyndromeMetabolic Syndrome XGenetic Predisposition to DiseaseHLA-B27 AntigenRheumatologyAntibodies, BacterialIritisDouble-Blind MethodBiological MarkersRabbitsSjogren's SyndromeAutoantibodiesAnti-Inflammatory AgentsCase-Control StudiesKnee JointEtretinateDisability EvaluationAge of OnsetNephrotic SyndromeHLA-B39 AntigenJoint DiseasesArthritis, Gouty