title: Adapted versions of the Sharp/van der Heijde score are reliable and valid for assessment of radiographic progression in juvenile idiopathic arthritis.
abstract: OBJECTIVE
  To develop adapted versions of the Sharp/van der Heijde radiographic scoring system for use in juvenile idiopathic arthritis (JIA), and to investigate their validity in JIA patients with polyarticular disease.
  
  
  METHODS
  The study group comprised 177 patients with polyarticular JIA. Radiographs of the wrist/hand of each patient were obtained at baseline (first observation) and then at 1, 3, 5, 7/8, and 10 years and were assessed independently by 2 pediatric rheumatologists according to different adaptations of the Sharp/van der Heijde method. To facilitate score assignment, the radiograph for each patient was compared with a bone age-related standard. Validation procedures included analysis of reliability, construct validity, and score progression over time.
  
  
  RESULTS
  Interobserver and intraobserver agreement on longitudinal score values and score changes was good for all of the adapted scoring versions (intraclass correlation coefficient >0.85). Score changes over time were moderately to strongly correlated with the clinical indicators of long-term joint damage and with the amount of long-term radiographic damage as measured with the carpo:metacarpal ratio, thereby demonstrating good construct validity. A steady increase in scores over time was observed, with joint space narrowing being the most common form of damage throughout the disease course. The inclusion of 5 new areas appeared to increase the overall construct validity of erosion scores.
  
  
  CONCLUSIONS
  Our results show that the adapted versions of the Sharp/van der Heijde score are reliable and valid for the assessment of radiographic progression in patients with JIA.
authors.affiliation: Università degli Studi di Genoa, and IRCCS, Istituto G. Gaslini, Genoa, Italy. angeloravelli@ospedale-gaslini.ge.it
authors.forename: Angelo
authors.initials: A
authors.lastname: Ravelli
authors.forename: Maka
authors.initials: M
authors.lastname: Ioseliani
authors.forename: Ximena
authors.initials: X
authors.lastname: Norambuena
authors.forename: Juliana
authors.initials: J
authors.lastname: Sato
authors.forename: Angela
authors.initials: A
authors.lastname: Pistorio
authors.forename: Federica
authors.initials: F
authors.lastname: Rossi
authors.forename: Nicolino
authors.initials: N
authors.lastname: Ruperto
authors.forename: Silvia
authors.initials: S
authors.lastname: Magni-Manzoni
authors.forename: Nicola
authors.initials: N
authors.lastname: Ullmann
authors.forename: Alberto
authors.initials: A
authors.lastname: Martini
mesh_terms: D000293:Adolescent; D001171:Arthritis, Juvenile / Q000000981:diagnostic imaging*; D002648:Child; D002675:Child, Preschool; D018450:Disease Progression; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D011859:Radiography; D015203:Reproducibility of Results; D012720:Severity of Illness Index