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Table 1 Categorisation of working diagnoses

From: Predicting persistent inflammatory arthritis amongst early arthritis clinic patients in the UK: is musculoskeletal ultrasound required?

• RA   
• UA   
• Non-RA: "Inflammatory" Psoriatic arthritis
   Reactive/self-limiting inflammatory arthritis
   Ankylosing spondylitis*
   Enteropathic arthritis
   Undifferentiated spondyloarthritis (not RA)
   CTD
   Crystal
   Other
  "Non-inflammatory" Osteoarthritis
   Noninflammatory arthralgia/other.
  1. Categorisation of working diagnoses used amongst early arthritis patients at inception and follow-up during the course of this study. Consultant rheumatologists were asked to tick one box at each clinic visit, indicating the best description of their expert opinion of the diagnosis at a given time. See text. *Where modified New York criteria for the diagnosis of ankylosing spondylitis were not met, but the diagnosis was suspected in the context of seronegative inflammatory disease, consultants were asked to record a diagnosis of "undifferentiated spondyloarthritis".