title: Recreational physical activity and the risk of osteoarthritis of the hip in elderly women.
abstract: OBJECTIVE
  The relationship between recreational physical activity and the risk of osteoarthritis (OA) of the hip in women is uncertain. We examined the cross sectional association of radiographic OA of the hip and past recreational and sports related physical activity in elderly women who are participants in the Study of Osteoporotic Fractures.
  
  
  METHODS
  An anteroposterior pelvic radiograph of 5818 subjects was assessed for hip OA using reliable measurements of individual radiographic features. Hips were graded on a summary scale of 0 (no findings) to 4 (severe OA) based on the number and type of radiographic features present. Logistic regression was used to examine the association of self-reported recreational physical activity (times/week) as a teenager, at age 30, and at age 50 with hip OA. All analyses were adjusted for age and body mass index at age 25 years.
  
  
  RESULTS
  The risk of moderate to severe radiographic hip OA in elderly women was modestly increased in elderly women who were in the highest quartile for all physical activities performed as a teenager (odds ratio 1.7, 95% confidence interval 1.1, 2.4), at age 50 (OR 1.4, 95% CI 1.0, 1.9) and weight bearing activities at age 30 (OR 1.4, 95% CI 1.0, 1.9) compared to women in the lowest quartile of activity. The risk of symptomatic hip OA (grade > or =2 hip OA + hip pain) was modestly increased in women who were in the highest quartile for all physical activities as a teenager (OR 2.0, 95% CI 1.2, 3.4), at age 50 (OR 1.6, 95% CI 1.0, 2.4), and weight bearing activities at age 30 (OR 1.6, 95% CI 1.0, 2.4) compared to women in the lowest quartile of activity.
  
  
  CONCLUSIONS
  Recreational physical activities performed by women before menopause may increase the risk of radiographic and symptomatic hip OA.
authors.affiliation: Department of Medicine and Epidemiology, University of California at San Francisco, 94143, USA.
authors.forename: N E
authors.initials: NE
authors.lastname: Lane
authors.forename: M C
authors.initials: MC
authors.lastname: Hochberg
authors.forename: A
authors.initials: A
authors.lastname: Pressman
authors.forename: J C
authors.initials: JC
authors.lastname: Scott
authors.forename: M C
authors.initials: MC
authors.lastname: Nevitt
mesh_terms: D000367:Age Factors; D000368:Aged; D015331:Cohort Studies; D016001:Confidence Intervals; D003430:Cross-Sectional Studies; D015444:Exercise; D005260:Female; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000473:pathology; D006801:Humans; D016015:Logistic Models; D016017:Odds Ratio; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000209:etiology*; D011859:Radiography; D011998:Recreation; D012307:Risk Factors; D014481:United States / Q000453:epidemiology; D016474:Weight-Bearing