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Association of leg-length inequality with knee osteoarthritis: a cohort study

Harvey, William F; Yang, Mei; Cooke, Theodore DV; Segal, Neil A; Lane, Nancy; Lewis, Cora E; Felson, David T

Annals of Internal Medicine. 2010;152(5):287-295.

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Abstract

BACKGROUND: Leg-length inequality is common in the general population and may accelerate development of knee osteoarthritis. OBJECTIVE: To determine whether leg-length inequality is associated with prevalent, incident, and progressive knee osteoarthritis. DESIGN: Prospective observational cohort study. SETTING: Population samples from Birmingham, Alabama, and Iowa City, Iowa. PATIENTS: 3026 participants aged 50 to 79 years with or at high risk for knee osteoarthritis. MEASUREMENTS: The exposure was leg-length inequality, measured by full-limb radiography. The outcomes were prevalent, incident, and progressive knee osteoarthritis. Radiographic osteoarthritis was defined as Kellgren and Lawrence grade 2 or greater, and symptomatic osteoarthritis was defined as radiographic disease in a consistently painful knee. RESULTS: Compared with leg-length inequality less than 1 cm, leg-length inequality of 1 cm or more was associated with prevalent radiographic (53% vs. 36%; odds ratio [OR], 1.9 [95% CI, 1.5 to 2.4]) and symptomatic (30% vs. 17%; OR, 2.0 [CI, 1.6 to 2.6]) osteoarthritis in the shorter leg, incident symptomatic osteoarthritis in the shorter leg (15% vs. 9%; OR, 1.7 [CI, 1.2 to 2.4]) and the longer leg (13% vs. 9%; OR, 1.5 [CI, 1.0 to 2.1]), and increased odds of progressive osteoarthritis in the shorter leg (29% vs. 24%; OR, 1.3 [CI, 1.0 to 1.7]). LIMITATIONS: Duration of follow-up may not be long enough to adequately identify cases of incidence and progression. Measurements of leg length, including radiography, are subject to measurement error, which could result in misclassification. CONCLUSION: Radiographic leg-length inequality was associated with prevalent, incident symptomatic, and progressive knee osteoarthritis. Leg-length inequality is a potentially modifiable risk factor for knee osteoarthritis. PRIMARY FUNDING SOURCE: National Institute on Aging.

Bibliographic metadata

Content type:
Publication type:
Publication form:
Published date:
Language:
eng
Abbreviated journal title:
ISSN:
Place of publication:
United States
Volume:
152
Issue:
5
Start page:
287
End page:
295
Total:
9
Digital Object Identifier:
10.7326/0003-4819-152-5-201003020-00006
Pubmed Identifier:
20194234
Pii Identifier:
152/5/287
Access state:
Active

Institutional metadata

University researcher(s):

Record metadata

Manchester eScholar ID:
uk-ac-man-scw:79674
Created by:
Ingram, Mary
Created:
27th April, 2010, 09:04:33
Last modified by:
Bentley, Hazel
Last modified:
26th October, 2015, 21:47:52

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