Spondylitis, AnkylosingSpondylitisJointsHLA-B27 AntigenSacroiliac JointKnee JointJoint DiseasesSpineAntirheumatic AgentsSpondylarthritisFinger JointHip JointAnkle JointSpondylarthropathiesSeverity of Illness IndexArthritis, RheumatoidTarsal JointsBlood SedimentationArthritis, PsoriaticWrist JointIritisArthritisTuberculosis, SpinalArthritis, ReactiveRheumatic DiseasesJoint CapsuleBalneologyLumbar VertebraeUveitis, AnteriorKyphosisThoracic VertebraeOsteoarthritisSternoclavicular JointTreatment OutcomeJoint InstabilityTemporomandibular Joint DisordersCervical VertebraeAnkylosisMetatarsophalangeal JointHLA AntigensSynovial FluidOsteitisBack PainFoot JointsAnti-Inflammatory Agents, Non-SteroidalImmunoglobulin GSpinal DiseasesSulfasalazineSynovitisReceptors, Tumor Necrosis FactorPseudarthrosisShoulder JointSacroiliitisAntibodies, MonoclonalJoint ProsthesisTumor Necrosis Factor-alphaArthritis, InfectiousRange of Motion, ArticularRheumatologyKlebsiellaPsoas Abscess