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Logo of annrheumdAnnals of the Rheumatic DiseasesCurrent TOCInstructions for authors
Ann Rheum Dis. Sep 2004; 63(9): 1022–1027.
PMCID: PMC1755130

Genetic risk of knee osteoarthritis: a sibling study


Objectives: To determine whether there is a genetic contribution to knee osteoarthritis (OA) as defined by structural change on plain radiographs.

Design: Sibling study. Comparison of knee OA prevalence in the community with knee OA prevalence among siblings of index cases with knee OA.

Subjects: 490 knee OA index cases listed for total knee replacement and 737 of their siblings aged >40 years, 1729 community subjects aged >40 years.

Main outcome measure: Odds ratio for radiographic knee OA in siblings v community participants.

Results: The age, sex, and knee pain adjusted odds ratios in siblings were 2.9 (95% confidence interval 2.3 to 3.7) for tibiofemoral OA and 1.7 (1.4 to 2.2) for patellofemoral OA. This difference remained after adjustment for important environmental risk factors. The heritability estimate for knee OA was 0.62.

Conclusions: Siblings are at increased risk of knee OA in comparison with the general population. This is likely to be due to genetic factors.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
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Figures and Tables

Figure 1
 Recruitment of index cases and siblings.
Figure 2
 Tibiofemoral osteoarthritis prevalence in siblings and in the community.
Figure 3
 Patellofemoral osteoarthritis prevalence in siblings and in the community.

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