title: Outcome of early monoarthritis: a followup study.
abstract: OBJECTIVE
  To evaluate clinical, laboratory, and radiological features and outcomes in patients with monoarthritis (MA), identified in a cohort of patients with early arthritis.
  
  
  METHODS
  A cohort of 270 patients with undiagnosed arthritis of less than 1 year's duration was divided into 3 groups: single episode of MA (MA, n = 27), MA with a history of patient-reported arthritis (MA + past, n = 23), and oligo- or polyarthritis (OA/PA, n = 220). At 6-month intervals, all patients underwent a standardized examination, radiographs, and standard laboratory tests including rheumatoid factors (RF), antiperinuclear factor (APF), antikeratin antibody (AKA), anticyclic citrullinated peptide antibody (anti-CCP), antinuclear antibodies, and HLA-AB-DR typing. After a median followup of 30 months, the diagnosis was evaluated by a hospital-based rheumatologist.
  
  
  RESULTS
  Age and sex did not differ across the 3 groups. Knee involvement was more common in the MA group than in the MA + past group (p < 0.03), whereas hand and metatarsophalangeal involvement was less common (p < 0.03 and p < 0.0001, respectively). RF and anti-CCP were less often positive in the MA group than in the MA + past group (p < 0.02 and p < 0.001, respectively) and the OA/PA group (p < 0.02 and p < 0.03). No patient in the MA group received a diagnosis of rheumatoid arthritis (RA). RA was less common and disease modifying antirheumatic drugs were prescribed less often in the MA group than in the other 2 groups (p < 0.0001 for both comparisons).
  
  
  CONCLUSIONS
  The MA group was clearly different from the other groups, with a favorable outcome and no risk of progression to RA.
authors.affiliation: Unit of Rheumatology and the Laboratory of Immunology, la Cavale Blanche Hospital, Brest Teaching Hospitals, Brest, France.
authors.forename: Aymeric
authors.initials: A
authors.lastname: Binard
authors.forename: Seydou
authors.initials: S
authors.lastname: Alassane
authors.forename: Valérie
authors.initials: V
authors.lastname: Devauchelle-Pensec
authors.forename: Jean M
authors.initials: JM
authors.lastname: Berthelot
authors.forename: Sandrine
authors.initials: S
authors.lastname: Jousse-Joulin
authors.forename: Gerard
authors.initials: G
authors.lastname: Chalés
authors.forename: Catherine
authors.initials: C
authors.lastname: Le Henaff
authors.forename: Jean B
authors.initials: JB
authors.lastname: Thorel
authors.forename: Sylvie
authors.initials: S
authors.lastname: Hoang
authors.forename: Pierre
authors.initials: P
authors.lastname: Youinou
authors.forename: Alain
authors.initials: A
authors.lastname: Saraux
mesh_terms: D000328:Adult; D000368:Aged; D001168:Arthritis / Q000175:diagnosis* / Q000000981:diagnostic imaging; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012307:Risk Factors