title: Performance of hand radiographs in predicting the diagnosis in patients with early arthritis.
abstract: OBJECTIVE
  To evaluate the ability of baseline hand radiographs to predict the diagnosis 2 years later in a cohort of patients with early arthritis.
  
  
  METHODS
  A total of 258 patients with arthritis onset within the previous year were evaluated. At baseline, all patients underwent a standardized evaluation including laboratory tests and radiographs. Hand radiographs were read by a blinded observer who used a standardized procedure for detecting features of crystal deposition diseases and rheumatoid arthritis (RA). After 30 +/- 11.3 months, the final diagnosis was established by a panel of rheumatologists. All radiographs were evaluated.
  
  
  RESULTS
  Significant associations were found between radiographic features and a clinical diagnosis of RA, calcium pyrophosphate dihydrate (CPPD) arthritis, and hydroxyapatite arthritis. No radiographic abnormalities suggesting psoriatic arthritis or gout were seen. The sensitivities of hand radiographs for diagnosing CPPD or hydroxyapatite arthritis ranged from 80% to 100%. Baseline hand radiographs suggested the final diagnosis in 31/258 patients, including 21 (22.5%) of the 93 patients with RA, 10 of the 11 (91%) patients with CPPD or hydroxyapatite deposition disease, and none of the patients with other disorders. Sensitivity was 29%, specificity 86.5%, positive predictive value 61%, and negative predictive value 63%.
  
  
  CONCLUSIONS
  In our cohort of patients with recent arthritis, the overall performance of hand radiographs in predicting a diagnosis 2 years later was modest. However, they had an excellent diagnostic value for calcium deposition diseases.
authors.affiliation: Unit of Rheumatology, Cavale Blanche Hospital, CHU Brest, Brest, France. valerie.devauchelle-pensec@chu-brest.fr
authors.forename: Valerie
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
authors.forename: Isabelle
authors.initials: I
authors.lastname: Samjee
authors.forename: Thierry
authors.initials: T
authors.lastname: Josseaume
authors.forename: Danielle
authors.initials: D
authors.lastname: Colin
authors.forename: Gerard
authors.initials: G
authors.lastname: Chalés
authors.forename: Jean B
authors.initials: JB
authors.lastname: Thorel
authors.forename: Sylvie
authors.initials: S
authors.lastname: Hoang
authors.forename: Antoine
authors.initials: A
authors.lastname: Martin
authors.forename: Pierre
authors.initials: P
authors.lastname: Youinou
authors.forename: Paul
authors.initials: P
authors.lastname: Le Goff
authors.forename: Alain
authors.initials: A
authors.lastname: Saraux
mesh_terms: D001172:Arthritis, Rheumatoid / Q000145:classification / Q000150:complications / Q000000981:diagnostic imaging*; D001175:Arthrography; D002805:Chondrocalcinosis / Q000145:classification / Q000150:complications / Q000000981:diagnostic imaging*; D017886:Durapatite / Q000032:analysis; D042241:Early Diagnosis; D005260:Female; D050823:Hand Joints / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity
chemical_list: D017886:Durapatite