title: Using the common sense model of illness perceptions to examine osteoarthritis change: a 6-year longitudinal study.
abstract: OBJECTIVE
  To examine the association between changes in common sense models and changes in functional status over a 6-year follow-up in patients with osteoarthritis.
  
  
  METHODS
  At baseline and follow-up, osteoarthritis outpatients (N = 241) recruited from a university medical center completed the Illness Perception Questionnaire-Revised (IPQ-R), the Australian/Canadian Osteoarthritis Hand Index, and the Western Ontario and McMasters Universities Osteoarthritis Index. Also, their physician-assessed pain intensity, and biomedical, and clinical measures of medical severity of osteoarthritis were recorded.
  
  
  METHODS
  Functional disability, pain intensity.
  
  
  RESULTS
  Over 6 years, functional disability and pain intensity increased. The IPQ-R dimensions of timeline, personal control, and illness coherence became more negative, and emotional representations became less negative (i.e., more accepting). Patients identified as sharing a similar profile of negative changes on the IPQ-R had significantly worse functioning on 2 of 3 outcomes, independent of objectively measured osteoarthritis severity.
  
  
  CONCLUSIONS
  Changes in illness perceptions were associated with changes in outcomes. Interventions to prevent increasingly negative patterns of illness perceptions over time, with an emphasis on strengthening control cognitions, may benefit functional status outcomes in patients with osteoarthritis.
authors.affiliation: Unit of Psychology, Leiden University Medical Center, Leiden, the Netherlands. a.a.kaptein@lumc.nl
authors.forename: Ad A
authors.initials: AA
authors.lastname: Kaptein
authors.forename: Jessica
authors.initials: J
authors.lastname: Bijsterbosch
authors.forename: Margreet
authors.initials: M
authors.lastname: Scharloo
authors.forename: Sarah E
authors.initials: SE
authors.lastname: Hampson
authors.forename: Herman M
authors.initials: HM
authors.lastname: Kroon
authors.forename: Margreet
authors.initials: M
authors.lastname: Kloppenburg
mesh_terms: D000339:Affect; D001294:Attitude to Health; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000150:complications* / Q000175:diagnosis* / Q000453:epidemiology; D010146:Pain / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology; D010147:Pain Measurement; D020377:Self Efficacy; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires