title: Carpal collapse in rheumatoid arthritis--prevalence and clinical significance: a preliminary study.
abstract: OBJECTIVE
  To evaluate the prevalence and clinical significance of carpal collapse in Mexican women with rheumatoid arthritis (RA).
  
  
  METHODS
  We evaluated the carpal height ratio (CHR) of 97 women with RA and 90 healthy women. Using plain radiographs of both hands, measurements were performed by 2 radiologists in a single blind fashion. We analyzed functional class, characteristics and duration of the disease, and presence of rheumatoid factor (RF).
  
  
  RESULTS
  CHR values of the controls were 0.49+/-0.02 (values reported in American Caucasian women are 0.54+/-0.04). Thirty-five patients had carpal collapse (defined as CHR < or = 0.43) in the right hand, 30 in the left hand, and 23 bilaterally. Carpal collapse was associated with RF seropositivity and roentgenographic degree of progression (p < 0.01), as well as with cumulative dose of steroids. As 95% of the patients were right-handed, dexterity was not apparently affected. We observed no differences in Health Assessment Questionnaire, functional class, or disease duration between patients with and those without carpal collapse.
  
  
  CONCLUSIONS
  The definition of carpal collapse may have ethnic related differences. Carpal collapse is common in Mexican women with RA and it is not an indicator of functional limitations.
authors.affiliation: Department of Rheumatology, Hospital de Especialidades Centro Medico Nacional León Guanajuato, Instituto Mexicano del Seguro Social, Mexico City, Mexico.
authors.forename: L
authors.initials: L
authors.lastname: Daza
authors.forename: F
authors.initials: F
authors.lastname: Arroyo
authors.forename: J
authors.initials: J
authors.lastname: Dozal
authors.forename: J
authors.initials: J
authors.lastname: Morales
mesh_terms: D000328:Adult; D017677:Age Distribution; D001172:Arthritis, Rheumatoid / Q000000981:diagnostic imaging* / Q000453:epidemiology*; D002348:Carpal Bones / Q000000981:diagnostic imaging / Q000503:physiopathology; D016022:Case-Control Studies; D015331:Cohort Studies; D015897:Comorbidity; D016001:Confidence Intervals; D018450:Disease Progression; D005260:Female; D006801:Humans; D007592:Joint Diseases / Q000453:epidemiology*; D008800:Mexico / Q000453:epidemiology; D008875:Middle Aged; D011336:Probability; D012372:ROC Curve; D011859:Radiography; D016059:Range of Motion, Articular; D012016:Reference Values; D018570:Risk Assessment; D012307:Risk Factors; D012720:Severity of Illness Index; D014955:Wrist Joint / Q000000981:diagnostic imaging* / Q000503:physiopathology*