title: Familial aggregation of osteoarthritis: data from the Baltimore Longitudinal Study on Aging.
abstract: OBJECTIVE
  To evaluate the familial aggregation of osteoarthritis (OA) in a cohort of healthy volunteers drawn from a community setting.
  
  
  METHODS
  Hand radiographs obtained between 1978 and 1991 and bilateral standing knee radiographs obtained between 1984 and 1991 were read for changes of OA, using Kellgren-Lawrence (K-L) scales. The hand sites were distal interphalangeal (DIP) joints, proximal interphalangeal (PIP) joints, and first carpometacarpal (CMC1) joints. For each joint group, the presence of OA in at least 1 joint in a joint group, the number of affected digits in each joint group, and the sum of the K-L grade across all joints were analyzed. Polyarticular OA was recorded if there were OA findings in 2 of 3 hand joint groups plus 1 or both knees. Data from 167 families with hand radiographs, 157 families with knee radiographs, and 148 families with both hand and knee radiographs were analyzed for sib-sib correlations.
  
  
  RESULTS
  After adjustment for age, sex, and body mass index, clinically relevant sib-sib common correlations were found for OA of the DIP, PIP, and CMC1 joints, for OA at 2 or 3 hand sites, and for polyarticular OA (r = 0.33-0.81) when OA was defined according to the number of affected joints or as the sum of the K-L grade across all joints.
  
  
  CONCLUSIONS
  These results from a cohort of volunteers drawn from a community setting and ascertained without regard to OA status demonstrate familial aggregation of OA and contribute to the evidence for heritability of OA.
authors.affiliation: National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, Maryland, USA.
authors.forename: R
authors.initials: R
authors.lastname: Hirsch
authors.forename: M
authors.initials: M
authors.lastname: Lethbridge-Cejku
authors.forename: R
authors.initials: R
authors.lastname: Hanson
authors.forename: W W
authors.initials: WW
authors.lastname: Scott
authors.forename: R
authors.initials: R
authors.lastname: Reichle
authors.forename: C C
authors.initials: CC
authors.lastname: Plato
authors.forename: J D
authors.initials: JD
authors.lastname: Tobin
authors.forename: M C
authors.initials: MC
authors.lastname: Hochberg
mesh_terms: D000328:Adult; D000368:Aged; D015142:Baltimore; D015992:Body Mass Index; D015331:Cohort Studies; D005260:Female; D006225:Hand / Q000000981:diagnostic imaging; D006801:Humans; D007717:Knee / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D010003:Osteoarthritis / Q000000981:diagnostic imaging* / Q000235:genetics*; D011859:Radiography