title: Radiographic joint space width in the fingers of patients with rheumatoid arthritis of less than one year's duration.
abstract: OBJECTIVE
  To determine the radiographic joint space width (JSW) in undamaged metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints of patients with early rheumatoid arthritis (RA) and to identify important clinical determinants of JSW.
  
  
  METHODS
  Radiographs of patients with RA of <1 year's duration, from an early arthritis cohort at a tertiary care rheumatology clinic, were obtained. JSW was analyzed by joint, finger, age, sex, height, and a number of other clinically relevant variables. Multivariate analysis was also performed, to account for possible confounding between variables.
  
  
  RESULTS
  Thirty-eight patients were included in the study. We found that JSW was greater in the MCP joint than the PIP joint (P < 0.0001). JSW was significantly greater in men (P < 0.0001) and increased with increasing height (P < 0.003), but was not associated with age (P < 0.21). In multivariate analyses, sex was shown to be the most important predictor of JSW.
  
  
  CONCLUSIONS
  In patients with early RA, MCP and PIP JSW is significantly associated with sex and height. In studies of RA in which JSW measurements are included as an outcome, these differences may need to be accounted for in the analysis.
authors.affiliation: Robert B. Brigham Arthritis and Musculoskeletal Diseases Clinical Research Center, Brigham and Women's Hospital, and Harvard Medical School, Boston, Massachusetts, USA.
authors.forename: Ewan C
authors.initials: EC
authors.lastname: Goligher
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Duryea
authors.forename: Matthew H
authors.initials: MH
authors.lastname: Liang
authors.forename: Frederick
authors.initials: F
authors.lastname: Wolfe
authors.forename: Axel
authors.initials: A
authors.lastname: Finckh
mesh_terms: D001172:Arthritis, Rheumatoid / Q000000981:diagnostic imaging*; D005260:Female; D005384:Finger Joint / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D013997:Time Factors